Fix array spread with sideeffects (#41523)

* Fix array spread with sideeffects

* Minor cleanup, ensure multiple emit helpers for outfile tests

src/compiler/checker.ts

@@ -24695,7 +24695,7 @@ namespace ts {
 
         function checkSpreadExpression(node: SpreadElement, checkMode?: CheckMode): Type {
             if (languageVersion < ScriptTarget.ES2015) {
-                checkExternalEmitHelpers(node, compilerOptions.downlevelIteration ? ExternalEmitHelpers.SpreadIncludes : ExternalEmitHelpers.SpreadArrays);
+                checkExternalEmitHelpers(node, compilerOptions.downlevelIteration ? ExternalEmitHelpers.SpreadIncludes : ExternalEmitHelpers.SpreadArray);
             }
 
             const arrayOrIterableType = checkExpression(node.expression, checkMode);
@@ -24723,7 +24723,7 @@ namespace ts {
                 const e = elements[i];
                 if (e.kind === SyntaxKind.SpreadElement) {
                     if (languageVersion < ScriptTarget.ES2015) {
-                        checkExternalEmitHelpers(e, compilerOptions.downlevelIteration ? ExternalEmitHelpers.SpreadIncludes : ExternalEmitHelpers.SpreadArrays);
+                        checkExternalEmitHelpers(e, compilerOptions.downlevelIteration ? ExternalEmitHelpers.SpreadIncludes : ExternalEmitHelpers.SpreadArray);
                     }
                     const spreadType = checkExpression((<SpreadElement>e).expression, checkMode, forceTuple);
                     if (isArrayLikeType(spreadType)) {
@@ -39048,8 +39048,7 @@ namespace ts {
                 case ExternalEmitHelpers.Generator: return "__generator";
                 case ExternalEmitHelpers.Values: return "__values";
                 case ExternalEmitHelpers.Read: return "__read";
-                case ExternalEmitHelpers.Spread: return "__spread";
-                case ExternalEmitHelpers.SpreadArrays: return "__spreadArrays";
+                case ExternalEmitHelpers.SpreadArray: return "__spreadArray";
                 case ExternalEmitHelpers.Await: return "__await";
                 case ExternalEmitHelpers.AsyncGenerator: return "__asyncGenerator";
                 case ExternalEmitHelpers.AsyncDelegator: return "__asyncDelegator";

src/compiler/factory/emitHelpers.ts

@@ -19,8 +19,7 @@ namespace ts {
         // ES2015 Helpers
         createExtendsHelper(name: Identifier): Expression;
         createTemplateObjectHelper(cooked: ArrayLiteralExpression, raw: ArrayLiteralExpression): Expression;
-        createSpreadHelper(argumentList: readonly Expression[]): Expression;
-        createSpreadArraysHelper(argumentList: readonly Expression[]): Expression;
+        createSpreadArrayHelper(to: Expression, from: Expression): Expression;
         // ES2015 Destructuring Helpers
         createValuesHelper(expression: Expression): Expression;
         createReadHelper(iteratorRecord: Expression, count: number | undefined): Expression;
@@ -58,8 +57,7 @@ namespace ts {
             // ES2015 Helpers
             createExtendsHelper,
             createTemplateObjectHelper,
-            createSpreadHelper,
-            createSpreadArraysHelper,
+            createSpreadArrayHelper,
             // ES2015 Destructuring Helpers
             createValuesHelper,
             createReadHelper,
@@ -284,22 +282,12 @@ namespace ts {
             );
         }
 
-        function createSpreadHelper(argumentList: readonly Expression[]) {
-            context.requestEmitHelper(readHelper);
-            context.requestEmitHelper(spreadHelper);
+        function createSpreadArrayHelper(to: Expression, from: Expression) {
+            context.requestEmitHelper(spreadArrayHelper);
             return factory.createCallExpression(
-                getUnscopedHelperName("__spread"),
+                getUnscopedHelperName("__spreadArray"),
                 /*typeArguments*/ undefined,
-                argumentList
-            );
-        }
-
-        function createSpreadArraysHelper(argumentList: readonly Expression[]) {
-            context.requestEmitHelper(spreadArraysHelper);
-            return factory.createCallExpression(
-                getUnscopedHelperName("__spreadArrays"),
-                /*typeArguments*/ undefined,
-                argumentList
+                [to, from]
             );
         }
 
@@ -629,29 +617,15 @@ namespace ts {
             };`
     };
 
-    export const spreadHelper: UnscopedEmitHelper = {
-        name: "typescript:spread",
-        importName: "__spread",
-        scoped: false,
-        dependencies: [readHelper],
-        text: `
-            var __spread = (this && this.__spread) || function () {
-                for (var ar = [], i = 0; i < arguments.length; i++) ar = ar.concat(__read(arguments[i]));
-                return ar;
-            };`
-    };
-
-    export const spreadArraysHelper: UnscopedEmitHelper = {
-        name: "typescript:spreadArrays",
-        importName: "__spreadArrays",
+    export const spreadArrayHelper: UnscopedEmitHelper = {
+        name: "typescript:spreadArray",
+        importName: "__spreadArray",
         scoped: false,
         text: `
-            var __spreadArrays = (this && this.__spreadArrays) || function () {
-                for (var s = 0, i = 0, il = arguments.length; i < il; i++) s += arguments[i].length;
-                for (var r = Array(s), k = 0, i = 0; i < il; i++)
-                    for (var a = arguments[i], j = 0, jl = a.length; j < jl; j++, k++)
-                        r[k] = a[j];
-                return r;
+            var __spreadArray = (this && this.__spreadArray) || function (to, from) {
+                for (var i = 0, il = from.length, j = to.length; i < il; i++, j++)
+                    to[j] = from[i];
+                return to;
             };`
     };
 
@@ -886,8 +860,7 @@ namespace ts {
             awaiterHelper,
             extendsHelper,
             templateObjectHelper,
-            spreadHelper,
-            spreadArraysHelper,
+            spreadArrayHelper,
             valuesHelper,
             readHelper,
             generatorHelper,
@@ -917,4 +890,11 @@ namespace ts {
                 return name => cache[name] || (cache[name] = { get value() { return geti(name); }, set value(v) { seti(name, v); } });
             })(name => super[name], (name, value) => super[name] = value);`
     };
+
+    export function isCallToHelper(firstSegment: Expression, helperName: __String) {
+        return isCallExpression(firstSegment)
+            && isIdentifier(firstSegment.expression)
+            && (getEmitFlags(firstSegment.expression) & EmitFlags.HelperName)
+            && firstSegment.expression.escapedText === helperName;
+    }
 }

src/compiler/transformers/es2015.ts

@@ -3892,17 +3892,41 @@ namespace ts {
          *
          * @param elements The array of Expression nodes.
          * @param needsUniqueCopy A value indicating whether to ensure that the result is a fresh array.
+         * This should be `true` when spreading into an `ArrayLiteral`, and `false` when spreading into an
+         * argument list.
          * @param multiLine A value indicating whether the result should be emitted on multiple lines.
          */
         function transformAndSpreadElements(elements: NodeArray<Expression>, needsUniqueCopy: boolean, multiLine: boolean, hasTrailingComma: boolean): Expression {
+            // When there is no leading SpreadElement:
+            //
             // [source]
             //      [a, ...b, c]
             //
             // [output (downlevelIteration)]
-            //      __spread([a], b, [c])
+            //      __spreadArray(__spreadArray([a], __read(b)), [c])
             //
             // [output]
-            //      __spreadArrays([a], b, [c])
+            //      __spreadArray(__spreadArray([a], b), [c])
+            //
+            // When there *is* a leading SpreadElement:
+            //
+            // [source]
+            //      [...a, b]
+            //
+            // [output (downlevelIteration)]
+            //      __spreadArray(__spreadArray([], __read(a)), [b])
+            //
+            // [output]
+            //      __spreadArray(__spreadArray([], a), [b])
+            //
+            // NOTE: We use `isPackedArrayLiteral` below rather than just `isArrayLiteral`
+            // because ES2015 spread will replace _missing_ array elements with `undefined`,
+            // so we cannot just use an array as is. For example:
+            //
+            // `[1, ...[2, , 3]]` becomes `[1, 2, undefined, 3]`
+            //
+            // However, for packed array literals (i.e., an array literal with no OmittedExpression
+            // elements), we can use the array as-is.
 
             // Map spans of spread expressions into their expressions and spans of other
             // expressions into an array literal.
@@ -3913,43 +3937,33 @@ namespace ts {
                 )
             );
 
-            if (compilerOptions.downlevelIteration) {
-                if (segments.length === 1) {
-                    const firstSegment = segments[0];
-                    if (isCallToHelper(firstSegment, "___spread" as __String)) {
-                        return segments[0];
-                    }
+            if (segments.length === 1) {
+                const firstSegment = segments[0];
+                // If we don't need a unique copy, then we are spreading into an argument list for
+                // a CallExpression or NewExpression. When using `--downlevelIteration`, we need
+                // to coerce this into an array for use with `apply`, so we will use the code path
+                // that follows instead.
+                if (!needsUniqueCopy && !compilerOptions.downlevelIteration
+                    || isPackedArrayLiteral(firstSegment) // see NOTE (above)
+                    || isCallToHelper(firstSegment, "___spreadArray" as __String)) {
+                    return segments[0];
                 }
-
-                return emitHelpers().createSpreadHelper(segments);
             }
-            else {
-                if (segments.length === 1) {
-                    const firstSegment = segments[0];
-                    if (!needsUniqueCopy
-                        || isPackedArrayLiteral(firstSegment)
-                        || isCallToHelper(firstSegment, "___spreadArrays" as __String)) {
-                        return segments[0];
-                    }
-                }
 
-                return emitHelpers().createSpreadArraysHelper(segments);
+            const helpers = emitHelpers();
+            const startsWithSpread = isSpreadElement(elements[0]);
+            let expression: Expression =
+                startsWithSpread ? factory.createArrayLiteralExpression() :
+                segments[0];
+            for (let i = startsWithSpread ? 0 : 1; i < segments.length; i++) {
+                expression = helpers.createSpreadArrayHelper(
+                    expression,
+                    compilerOptions.downlevelIteration && !isPackedArrayLiteral(segments[i]) ? // see NOTE (above)
+                        helpers.createReadHelper(segments[i], /*count*/ undefined) :
+                        segments[i]);
             }
-        }
 
-        function isPackedElement(node: Expression) {
-            return !isOmittedExpression(node);
-        }
-
-        function isPackedArrayLiteral(node: Expression) {
-            return isArrayLiteralExpression(node) && every(node.elements, isPackedElement);
-        }
-
-        function isCallToHelper(firstSegment: Expression, helperName: __String) {
-            return isCallExpression(firstSegment)
-                && isIdentifier(firstSegment.expression)
-                && (getEmitFlags(firstSegment.expression) & EmitFlags.HelperName)
-                && firstSegment.expression.escapedText === helperName;
+            return expression;
         }
 
         function partitionSpread(node: Expression) {

src/compiler/types.ts

@@ -6605,19 +6605,18 @@ namespace ts {
         Generator = 1 << 7,             // __generator (used by ES2015 generator transformation)
         Values = 1 << 8,                // __values (used by ES2015 for..of and yield* transformations)
         Read = 1 << 9,                  // __read (used by ES2015 iterator destructuring transformation)
-        Spread = 1 << 10,               // __spread (used by ES2015 array spread and argument list spread transformations)
-        SpreadArrays = 1 << 11,         // __spreadArrays (used by ES2015 array spread and argument list spread transformations)
-        Await = 1 << 12,                // __await (used by ES2017 async generator transformation)
-        AsyncGenerator = 1 << 13,       // __asyncGenerator (used by ES2017 async generator transformation)
-        AsyncDelegator = 1 << 14,       // __asyncDelegator (used by ES2017 async generator yield* transformation)
-        AsyncValues = 1 << 15,          // __asyncValues (used by ES2017 for..await..of transformation)
-        ExportStar = 1 << 16,           // __exportStar (used by CommonJS/AMD/UMD module transformation)
-        ImportStar = 1 << 17,           // __importStar (used by CommonJS/AMD/UMD module transformation)
-        ImportDefault = 1 << 18,        // __importStar (used by CommonJS/AMD/UMD module transformation)
-        MakeTemplateObject = 1 << 19,   // __makeTemplateObject (used for constructing template string array objects)
-        ClassPrivateFieldGet = 1 << 20, // __classPrivateFieldGet (used by the class private field transformation)
-        ClassPrivateFieldSet = 1 << 21, // __classPrivateFieldSet (used by the class private field transformation)
-        CreateBinding = 1 << 22,        // __createBinding (use by the module transform for (re)exports and namespace imports)
+        SpreadArray = 1 << 10,          // __spreadArray (used by ES2015 array spread and argument list spread transformations)
+        Await = 1 << 11,                // __await (used by ES2017 async generator transformation)
+        AsyncGenerator = 1 << 12,       // __asyncGenerator (used by ES2017 async generator transformation)
+        AsyncDelegator = 1 << 13,       // __asyncDelegator (used by ES2017 async generator yield* transformation)
+        AsyncValues = 1 << 14,          // __asyncValues (used by ES2017 for..await..of transformation)
+        ExportStar = 1 << 15,           // __exportStar (used by CommonJS/AMD/UMD module transformation)
+        ImportStar = 1 << 16,           // __importStar (used by CommonJS/AMD/UMD module transformation)
+        ImportDefault = 1 << 17,        // __importStar (used by CommonJS/AMD/UMD module transformation)
+        MakeTemplateObject = 1 << 18,   // __makeTemplateObject (used for constructing template string array objects)
+        ClassPrivateFieldGet = 1 << 19, // __classPrivateFieldGet (used by the class private field transformation)
+        ClassPrivateFieldSet = 1 << 20, // __classPrivateFieldSet (used by the class private field transformation)
+        CreateBinding = 1 << 21,        // __createBinding (use by the module transform for (re)exports and namespace imports)
         FirstEmitHelper = Extends,
         LastEmitHelper = CreateBinding,
 
@@ -6634,8 +6633,7 @@ namespace ts {
         AsyncDelegatorIncludes = Await | AsyncDelegator | AsyncValues,
 
         // Helpers included by ES2015 spread
-        SpreadIncludes = Read | Spread,
-
+        SpreadIncludes = Read | SpreadArray,
     }
 
     export const enum EmitHint {

src/compiler/utilities.ts

@@ -7033,6 +7033,17 @@ namespace ts {
         }
     }
 
+    function isPackedElement(node: Expression) {
+        return !isOmittedExpression(node);
+    }
+
+    /**
+     * Determines whether the provided node is an ArrayLiteralExpression that contains no missing elements.
+     */
+    export function isPackedArrayLiteral(node: Expression) {
+        return isArrayLiteralExpression(node) && every(node.elements, isPackedElement);
+    }
+
     /**
      * Indicates whether the result of an `Expression` will be unused.
      *

src/testRunner/unittests/tsbuild/helpers.ts

@@ -615,7 +615,8 @@ const { b, ...rest } = { a: 10, b: 30, yy: 30 };
         const content = fs.readFileSync(path, "utf8");
         fs.writeFileSync(path, `${content}
 function ${project}${file}Spread(...b: number[]) { }
-${project}${file}Spread(...[10, 20, 30]);`);
+const ${project}${file}_ar = [20, 30];
+${project}${file}Spread(10, ...${project}${file}_ar);`);
 
         replaceText(fs, `src/${project}/tsconfig.json`, `"strict": false,`, `"strict": false,
     "downlevelIteration": true,`);

tests/baselines/reference/argumentExpressionContextualTyping.js

@@ -19,12 +19,10 @@ baz(["string", 1, true, ...array]);  // Error
 foo(o);                              // Error because x has an array type namely (string|number)[]
 
 //// [argumentExpressionContextualTyping.js]
-var __spreadArrays = (this && this.__spreadArrays) || function () {
-    for (var s = 0, i = 0, il = arguments.length; i < il; i++) s += arguments[i].length;
-    for (var r = Array(s), k = 0, i = 0; i < il; i++)
-        for (var a = arguments[i], j = 0, jl = a.length; j < jl; j++, k++)
-            r[k] = a[j];
-    return r;
+var __spreadArray = (this && this.__spreadArray) || function (to, from) {
+    for (var i = 0, il = from.length, j = to.length; i < il; i++, j++)
+        to[j] = from[i];
+    return to;
 };
 // In a typed function call, argument expressions are contextually typed by their corresponding parameter types.
 function foo(_a) {
@@ -43,5 +41,5 @@ var tuple = ["string", 1, true];
 baz(tuple);
 baz(["string", 1, true]);
 baz(array); // Error
-baz(__spreadArrays(["string", 1, true], array)); // Error
+baz(__spreadArray(["string", 1, true], array)); // Error
 foo(o); // Error because x has an array type namely (string|number)[]

tests/baselines/reference/arrayLiteralExpressionContextualTyping.js

@@ -16,12 +16,10 @@ var spr2:[number, number, number] = [1, 2, 3, ...tup];  // Error
 
 
 //// [arrayLiteralExpressionContextualTyping.js]
-var __spreadArrays = (this && this.__spreadArrays) || function () {
-    for (var s = 0, i = 0, il = arguments.length; i < il; i++) s += arguments[i].length;
-    for (var r = Array(s), k = 0, i = 0; i < il; i++)
-        for (var a = arguments[i], j = 0, jl = a.length; j < jl; j++, k++)
-            r[k] = a[j];
-    return r;
+var __spreadArray = (this && this.__spreadArray) || function (to, from) {
+    for (var i = 0, il = from.length, j = to.length; i < il; i++, j++)
+        to[j] = from[i];
+    return to;
 };
 // In a contextually typed array literal expression containing no spread elements, an element expression at index N is contextually typed by
 //      the type of the property with the numeric name N in the contextual type, if any, or otherwise
@@ -33,6 +31,6 @@ var tup1 = [1, 2, 3, "string"];
 var tup2 = [1, 2, 3, "string"]; // Error
 // In a contextually typed array literal expression containing one or more spread elements,
 // an element expression at index N is contextually typed by the numeric index type of the contextual type, if any.
-var spr = __spreadArrays([1, 2, 3], array);
-var spr1 = __spreadArrays([1, 2, 3], tup);
-var spr2 = __spreadArrays([1, 2, 3], tup); // Error
+var spr = __spreadArray([1, 2, 3], array);
+var spr1 = __spreadArray([1, 2, 3], tup);
+var spr2 = __spreadArray([1, 2, 3], tup); // Error

tests/baselines/reference/arrayLiteralSpread.js

@@ -24,27 +24,25 @@ function f2() {
 
 
 //// [arrayLiteralSpread.js]
-var __spreadArrays = (this && this.__spreadArrays) || function () {
-    for (var s = 0, i = 0, il = arguments.length; i < il; i++) s += arguments[i].length;
-    for (var r = Array(s), k = 0, i = 0; i < il; i++)
-        for (var a = arguments[i], j = 0, jl = a.length; j < jl; j++, k++)
-            r[k] = a[j];
-    return r;
+var __spreadArray = (this && this.__spreadArray) || function (to, from) {
+    for (var i = 0, il = from.length, j = to.length; i < il; i++, j++)
+        to[j] = from[i];
+    return to;
 };
 function f0() {
     var a = [1, 2, 3];
-    var a1 = __spreadArrays(a);
-    var a2 = __spreadArrays([1], a);
-    var a3 = __spreadArrays([1, 2], a);
-    var a4 = __spreadArrays(a, [1]);
-    var a5 = __spreadArrays(a, [1, 2]);
-    var a6 = __spreadArrays([1, 2], a, [1, 2]);
-    var a7 = __spreadArrays([1], a, [2], a);
-    var a8 = __spreadArrays(a, a, a);
+    var a1 = __spreadArray([], a);
+    var a2 = __spreadArray([1], a);
+    var a3 = __spreadArray([1, 2], a);
+    var a4 = __spreadArray(__spreadArray([], a), [1]);
+    var a5 = __spreadArray(__spreadArray([], a), [1, 2]);
+    var a6 = __spreadArray(__spreadArray([1, 2], a), [1, 2]);
+    var a7 = __spreadArray(__spreadArray(__spreadArray([1], a), [2]), a);
+    var a8 = __spreadArray(__spreadArray(__spreadArray([], a), a), a);
 }
 function f1() {
     var a = [1, 2, 3];
-    var b = __spreadArrays(["hello"], a, [true]);
+    var b = __spreadArray(__spreadArray(["hello"], a), [true]);
     var b;
 }
 function f2() {

tests/baselines/reference/arrayLiteralSpreadES5iterable.js

@@ -40,27 +40,28 @@ var __read = (this && this.__read) || function (o, n) {
     }
     return ar;
 };
-var __spread = (this && this.__spread) || function () {
-    for (var ar = [], i = 0; i < arguments.length; i++) ar = ar.concat(__read(arguments[i]));
-    return ar;
+var __spreadArray = (this && this.__spreadArray) || function (to, from) {
+    for (var i = 0, il = from.length, j = to.length; i < il; i++, j++)
+        to[j] = from[i];
+    return to;
 };
 function f0() {
     var a = [1, 2, 3];
-    var a1 = __spread(a);
-    var a2 = __spread([1], a);
-    var a3 = __spread([1, 2], a);
-    var a4 = __spread(a, [1]);
-    var a5 = __spread(a, [1, 2]);
-    var a6 = __spread([1, 2], a, [1, 2]);
-    var a7 = __spread([1], a, [2], a);
-    var a8 = __spread(a, a, a);
+    var a1 = __spreadArray([], __read(a));
+    var a2 = __spreadArray([1], __read(a));
+    var a3 = __spreadArray([1, 2], __read(a));
+    var a4 = __spreadArray(__spreadArray([], __read(a)), [1]);
+    var a5 = __spreadArray(__spreadArray([], __read(a)), [1, 2]);
+    var a6 = __spreadArray(__spreadArray([1, 2], __read(a)), [1, 2]);
+    var a7 = __spreadArray(__spreadArray(__spreadArray([1], __read(a)), [2]), __read(a));
+    var a8 = __spreadArray(__spreadArray(__spreadArray([], __read(a)), __read(a)), __read(a));
 }
 function f1() {
     var a = [1, 2, 3];
-    var b = __spread(["hello"], a, [true]);
+    var b = __spreadArray(__spreadArray(["hello"], __read(a)), [true]);
     var b;
 }
 function f2() {
-    var a = __spread([]);
-    var b = __spread([5]);
+    var a = [];
+    var b = [5];
 }

tests/baselines/reference/arrayLiterals2ES5.js

@@ -62,21 +62,19 @@ var d9 = [[...temp1], ...["hello"]];
 //      Elisionopt   SpreadElement
 //      ElementList, Elisionopt   AssignmentExpression
 //      ElementList, Elisionopt   SpreadElement
-var __spreadArrays = (this && this.__spreadArrays) || function () {
-    for (var s = 0, i = 0, il = arguments.length; i < il; i++) s += arguments[i].length;
-    for (var r = Array(s), k = 0, i = 0; i < il; i++)
-        for (var a = arguments[i], j = 0, jl = a.length; j < jl; j++, k++)
-            r[k] = a[j];
-    return r;
+var __spreadArray = (this && this.__spreadArray) || function (to, from) {
+    for (var i = 0, il = from.length, j = to.length; i < il; i++, j++)
+        to[j] = from[i];
+    return to;
 };
 // SpreadElement:
 //      ...   AssignmentExpression
 var a0 = [, , 2, 3, 4];
 var a1 = ["hello", "world"];
-var a2 = __spreadArrays([, , ], a0, ["hello"]);
-var a3 = __spreadArrays([, ], a0);
+var a2 = __spreadArray(__spreadArray([, , ], a0), ["hello"]);
+var a3 = __spreadArray([, ], a0);
 var a4 = [function () { return 1; },];
-var a5 = __spreadArrays(a0, [,]);
+var a5 = __spreadArray(__spreadArray([], a0), [,]);
 // Each element expression in a non-empty array literal is processed as follows:
 //    - If the array literal contains no spread elements, and if the array literal is contextually typed (section 4.19)
 //      by a type T and T has a property with the numeric name N, where N is the index of the element expression in the array literal,
@@ -99,13 +97,13 @@ var temp1 = [1, 2, 3];
 var temp2 = [[1, 2, 3], ["hello", "string"]];
 var temp3 = [undefined, null, undefined];
 var temp4 = [];
-var d0 = __spreadArrays([1, true], temp); // has type (string|number|boolean)[]
-var d1 = __spreadArrays(temp); // has type string[]
-var d2 = __spreadArrays(temp1);
-var d3 = __spreadArrays(temp1);
-var d4 = __spreadArrays(temp, temp1);
-var d5 = __spreadArrays(temp3);
-var d6 = __spreadArrays(temp4);
-var d7 = __spreadArrays(temp1);
-var d8 = [__spreadArrays(temp1)];
-var d9 = __spreadArrays([__spreadArrays(temp1)], ["hello"]);
+var d0 = __spreadArray([1, true], temp); // has type (string|number|boolean)[]
+var d1 = __spreadArray([], temp); // has type string[]
+var d2 = __spreadArray([], temp1);
+var d3 = __spreadArray([], temp1);
+var d4 = __spreadArray(__spreadArray([], temp), temp1);
+var d5 = __spreadArray([], temp3);
+var d6 = __spreadArray([], temp4);
+var d7 = __spreadArray([], temp1);
+var d8 = [__spreadArray([], temp1)];
+var d9 = __spreadArray([__spreadArray([], temp1)], ["hello"]);

tests/baselines/reference/arrayLiterals3.js

@@ -40,12 +40,10 @@ var c2: myArray = [...temp1, ...temp];            // Error cannot assign (number
 //    - If the array literal contains no spread elements, and if the array literal is contextually typed (section 4.19)
 //      by a type T and T has a property with the numeric name N, where N is the index of the element expression in the array literal,
 //      the element expression is contextually typed by the type of that property.
-var __spreadArrays = (this && this.__spreadArrays) || function () {
-    for (var s = 0, i = 0, il = arguments.length; i < il; i++) s += arguments[i].length;
-    for (var r = Array(s), k = 0, i = 0; i < il; i++)
-        for (var a = arguments[i], j = 0, jl = a.length; j < jl; j++, k++)
-            r[k] = a[j];
-    return r;
+var __spreadArray = (this && this.__spreadArray) || function (to, from) {
+    for (var i = 0, il = from.length, j = to.length; i < il; i++, j++)
+        to[j] = from[i];
+    return to;
 };
 // The resulting type an array literal expression is determined as follows:
 //     - If the array literal contains no spread elements and is contextually typed by a tuple-like type,
@@ -62,6 +60,6 @@ var _a = [1, 2, "string", true], b1 = _a[0], b2 = _a[1];
 var temp = ["s", "t", "r"];
 var temp1 = [1, 2, 3];
 var temp2 = [[1, 2, 3], ["hello", "string"]];
-var c0 = __spreadArrays(temp2); // Error
-var c1 = __spreadArrays(temp1); // Error cannot assign number[] to [number, number, number]
-var c2 = __spreadArrays(temp1, temp); // Error cannot assign (number|string)[] to number[]
+var c0 = __spreadArray([], temp2); // Error
+var c1 = __spreadArray([], temp1); // Error cannot assign number[] to [number, number, number]
+var c2 = __spreadArray(__spreadArray([], temp1), temp); // Error cannot assign (number|string)[] to number[]

tests/baselines/reference/callChain.js

@@ -43,38 +43,36 @@ o2?.b()!.toString!;
 
 //// [callChain.js]
 "use strict";
-var __spreadArrays = (this && this.__spreadArrays) || function () {
-    for (var s = 0, i = 0, il = arguments.length; i < il; i++) s += arguments[i].length;
-    for (var r = Array(s), k = 0, i = 0; i < il; i++)
-        for (var a = arguments[i], j = 0, jl = a.length; j < jl; j++, k++)
-            r[k] = a[j];
-    return r;
+var __spreadArray = (this && this.__spreadArray) || function (to, from) {
+    for (var i = 0, il = from.length, j = to.length; i < il; i++, j++)
+        to[j] = from[i];
+    return to;
 };
 var _a, _b, _c, _d, _e, _f, _g, _h, _j, _k, _l, _m, _o;
 o1 === null || o1 === void 0 ? void 0 : o1();
 o1 === null || o1 === void 0 ? void 0 : o1(1);
 o1 === null || o1 === void 0 ? void 0 : o1.apply(void 0, [1, 2]);
-o1 === null || o1 === void 0 ? void 0 : o1.apply(void 0, __spreadArrays([1], [2, 3], [4]));
+o1 === null || o1 === void 0 ? void 0 : o1.apply(void 0, __spreadArray(__spreadArray([1], [2, 3]), [4]));
 o2 === null || o2 === void 0 ? void 0 : o2.b();
 o2 === null || o2 === void 0 ? void 0 : o2.b(1);
 o2 === null || o2 === void 0 ? void 0 : o2.b.apply(o2, [1, 2]);
-o2 === null || o2 === void 0 ? void 0 : o2.b.apply(o2, __spreadArrays([1], [2, 3], [4]));
+o2 === null || o2 === void 0 ? void 0 : o2.b.apply(o2, __spreadArray(__spreadArray([1], [2, 3]), [4]));
 o2 === null || o2 === void 0 ? void 0 : o2["b"]();
 o2 === null || o2 === void 0 ? void 0 : o2["b"](1);
 o2 === null || o2 === void 0 ? void 0 : o2["b"].apply(o2, [1, 2]);
-o2 === null || o2 === void 0 ? void 0 : o2["b"].apply(o2, __spreadArrays([1], [2, 3], [4]));
+o2 === null || o2 === void 0 ? void 0 : o2["b"].apply(o2, __spreadArray(__spreadArray([1], [2, 3]), [4]));
 (_a = o3.b) === null || _a === void 0 ? void 0 : _a.call(o3).c;
 (_b = o3.b) === null || _b === void 0 ? void 0 : _b.call(o3, 1).c;
-(_c = o3.b) === null || _c === void 0 ? void 0 : _c.call.apply(_c, __spreadArrays([o3], [1, 2])).c;
-(_d = o3.b) === null || _d === void 0 ? void 0 : _d.call.apply(_d, __spreadArrays([o3, 1], [2, 3], [4])).c;
+(_c = o3.b) === null || _c === void 0 ? void 0 : _c.call.apply(_c, __spreadArray([o3], [1, 2])).c;
+(_d = o3.b) === null || _d === void 0 ? void 0 : _d.call.apply(_d, __spreadArray(__spreadArray([o3, 1], [2, 3]), [4])).c;
 (_e = o3.b) === null || _e === void 0 ? void 0 : _e.call(o3)["c"];
 (_f = o3.b) === null || _f === void 0 ? void 0 : _f.call(o3, 1)["c"];
-(_g = o3.b) === null || _g === void 0 ? void 0 : _g.call.apply(_g, __spreadArrays([o3], [1, 2]))["c"];
-(_h = o3.b) === null || _h === void 0 ? void 0 : _h.call.apply(_h, __spreadArrays([o3, 1], [2, 3], [4]))["c"];
+(_g = o3.b) === null || _g === void 0 ? void 0 : _g.call.apply(_g, __spreadArray([o3], [1, 2]))["c"];
+(_h = o3.b) === null || _h === void 0 ? void 0 : _h.call.apply(_h, __spreadArray(__spreadArray([o3, 1], [2, 3]), [4]))["c"];
 (_j = o3["b"]) === null || _j === void 0 ? void 0 : _j.call(o3).c;
 (_k = o3["b"]) === null || _k === void 0 ? void 0 : _k.call(o3, 1).c;
-(_l = o3["b"]) === null || _l === void 0 ? void 0 : _l.call.apply(_l, __spreadArrays([o3], [1, 2])).c;
-(_m = o3["b"]) === null || _m === void 0 ? void 0 : _m.call.apply(_m, __spreadArrays([o3, 1], [2, 3], [4])).c;
+(_l = o3["b"]) === null || _l === void 0 ? void 0 : _l.call.apply(_l, __spreadArray([o3], [1, 2])).c;
+(_m = o3["b"]) === null || _m === void 0 ? void 0 : _m.call.apply(_m, __spreadArray(__spreadArray([o3, 1], [2, 3]), [4])).c;
 var v = o4 === null || o4 === void 0 ? void 0 : o4(incr);
 (_o = o5()) === null || _o === void 0 ? void 0 : _o();
 // GH#36031

tests/baselines/reference/callOverload.js

@@ -12,17 +12,15 @@ withRest();
 withRest(...n); 
 
 //// [callOverload.js]
-var __spreadArrays = (this && this.__spreadArrays) || function () {
-    for (var s = 0, i = 0, il = arguments.length; i < il; i++) s += arguments[i].length;
-    for (var r = Array(s), k = 0, i = 0; i < il; i++)
-        for (var a = arguments[i], j = 0, jl = a.length; j < jl; j++, k++)
-            r[k] = a[j];
-    return r;
+var __spreadArray = (this && this.__spreadArray) || function (to, from) {
+    for (var i = 0, il = from.length, j = to.length; i < il; i++, j++)
+        to[j] = from[i];
+    return to;
 };
 var n;
 fn(1); // no error
 fn(1, 2, 3, 4);
 takeTwo(1, 2, 3, 4);
-withRest.apply(void 0, __spreadArrays(['a'], n)); // no error
+withRest.apply(void 0, __spreadArray(['a'], n)); // no error
 withRest();
 withRest.apply(void 0, n);

tests/baselines/reference/callWithSpread.js

@@ -74,12 +74,10 @@ var __extends = (this && this.__extends) || (function () {
         d.prototype = b === null ? Object.create(b) : (__.prototype = b.prototype, new __());
     };
 })();
-var __spreadArrays = (this && this.__spreadArrays) || function () {
-    for (var s = 0, i = 0, il = arguments.length; i < il; i++) s += arguments[i].length;
-    for (var r = Array(s), k = 0, i = 0; i < il; i++)
-        for (var a = arguments[i], j = 0, jl = a.length; j < jl; j++, k++)
-            r[k] = a[j];
-    return r;
+var __spreadArray = (this && this.__spreadArray) || function (to, from) {
+    for (var i = 0, il = from.length, j = to.length; i < il; i++, j++)
+        to[j] = from[i];
+    return to;
 };
 var _a, _b, _c, _d, _e, _f, _g;
 function foo(x, y) {
@@ -93,23 +91,23 @@ var z;
 var obj;
 var xa;
 foo(1, 2, "abc");
-foo.apply(void 0, __spreadArrays([1, 2], a));
-foo.apply(void 0, __spreadArrays([1, 2], a, ["abc"]));
+foo.apply(void 0, __spreadArray([1, 2], a));
+foo.apply(void 0, __spreadArray(__spreadArray([1, 2], a), ["abc"]));
 obj.foo(1, 2, "abc");
-obj.foo.apply(obj, __spreadArrays([1, 2], a));
-obj.foo.apply(obj, __spreadArrays([1, 2], a, ["abc"]));
-obj.foo.apply(obj, __spreadArrays([1, 2], a)).foo(1, 2, "abc");
-(_a = obj.foo.apply(obj, __spreadArrays([1, 2], a))).foo.apply(_a, __spreadArrays([1, 2], a));
-(_b = obj.foo.apply(obj, __spreadArrays([1, 2], a))).foo.apply(_b, __spreadArrays([1, 2], a, ["abc"]));
+obj.foo.apply(obj, __spreadArray([1, 2], a));
+obj.foo.apply(obj, __spreadArray(__spreadArray([1, 2], a), ["abc"]));
+obj.foo.apply(obj, __spreadArray([1, 2], a)).foo(1, 2, "abc");
+(_a = obj.foo.apply(obj, __spreadArray([1, 2], a))).foo.apply(_a, __spreadArray([1, 2], a));
+(_b = obj.foo.apply(obj, __spreadArray([1, 2], a))).foo.apply(_b, __spreadArray(__spreadArray([1, 2], a), ["abc"]));
 (obj.foo)(1, 2, "abc");
-obj.foo.apply(obj, __spreadArrays([1, 2], a));
-obj.foo.apply(obj, __spreadArrays([1, 2], a, ["abc"]));
-(obj.foo.apply(obj, __spreadArrays([1, 2], a)).foo)(1, 2, "abc");
-(_c = obj.foo.apply(obj, __spreadArrays([1, 2], a))).foo.apply(_c, __spreadArrays([1, 2], a));
-(_d = obj.foo.apply(obj, __spreadArrays([1, 2], a))).foo.apply(_d, __spreadArrays([1, 2], a, ["abc"]));
+obj.foo.apply(obj, __spreadArray([1, 2], a));
+obj.foo.apply(obj, __spreadArray(__spreadArray([1, 2], a), ["abc"]));
+(obj.foo.apply(obj, __spreadArray([1, 2], a)).foo)(1, 2, "abc");
+(_c = obj.foo.apply(obj, __spreadArray([1, 2], a))).foo.apply(_c, __spreadArray([1, 2], a));
+(_d = obj.foo.apply(obj, __spreadArray([1, 2], a))).foo.apply(_d, __spreadArray(__spreadArray([1, 2], a), ["abc"]));
 xa[1].foo(1, 2, "abc");
-(_e = xa[1]).foo.apply(_e, __spreadArrays([1, 2], a));
-(_f = xa[1]).foo.apply(_f, __spreadArrays([1, 2], a, ["abc"]));
+(_e = xa[1]).foo.apply(_e, __spreadArray([1, 2], a));
+(_f = xa[1]).foo.apply(_f, __spreadArray(__spreadArray([1, 2], a), ["abc"]));
 (_g = xa[1]).foo.apply(_g, [1, 2, "abc"]);
 var C = /** @class */ (function () {
     function C(x, y) {
@@ -118,7 +116,7 @@ var C = /** @class */ (function () {
             z[_i - 2] = arguments[_i];
         }
         this.foo(x, y);
-        this.foo.apply(this, __spreadArrays([x, y], z));
+        this.foo.apply(this, __spreadArray([x, y], z));
     }
     C.prototype.foo = function (x, y) {
         var z = [];
@@ -132,12 +130,12 @@ var D = /** @class */ (function (_super) {
     __extends(D, _super);
     function D() {
         var _this = _super.call(this, 1, 2) || this;
-        _this = _super.apply(this, __spreadArrays([1, 2], a)) || this;
+        _this = _super.apply(this, __spreadArray([1, 2], a)) || this;
         return _this;
     }
     D.prototype.foo = function () {
         _super.prototype.foo.call(this, 1, 2);
-        _super.prototype.foo.apply(this, __spreadArrays([1, 2], a));
+        _super.prototype.foo.apply(this, __spreadArray([1, 2], a));
     };
     return D;
 }(C));

tests/baselines/reference/callWithSpread2.js

@@ -38,31 +38,29 @@ prefix2("g", ...ns);
 
 
 //// [callWithSpread2.js]
-var __spreadArrays = (this && this.__spreadArrays) || function () {
-    for (var s = 0, i = 0, il = arguments.length; i < il; i++) s += arguments[i].length;
-    for (var r = Array(s), k = 0, i = 0; i < il; i++)
-        for (var a = arguments[i], j = 0, jl = a.length; j < jl; j++, k++)
-            r[k] = a[j];
-    return r;
+var __spreadArray = (this && this.__spreadArray) || function (to, from) {
+    for (var i = 0, il = from.length, j = to.length; i < il; i++, j++)
+        to[j] = from[i];
+    return to;
 };
 // good
 all.apply(void 0, ns);
 weird.apply(void 0, ns);
 weird.apply(void 0, mixed);
 weird.apply(void 0, tuple);
-prefix.apply(void 0, __spreadArrays(["a"], ns));
-rest.apply(void 0, __spreadArrays(["d"], ns));
+prefix.apply(void 0, __spreadArray(["a"], ns));
+rest.apply(void 0, __spreadArray(["d"], ns));
 // extra arguments
-normal.apply(void 0, __spreadArrays(["g"], ns));
+normal.apply(void 0, __spreadArray(["g"], ns));
 thunk.apply(void 0, ns);
 // bad
 all.apply(void 0, mixed);
 all.apply(void 0, tuple);
-prefix.apply(void 0, __spreadArrays(["b"], mixed));
-prefix.apply(void 0, __spreadArrays(["c"], tuple));
-rest.apply(void 0, __spreadArrays(["e"], mixed));
-rest.apply(void 0, __spreadArrays(["f"], tuple));
+prefix.apply(void 0, __spreadArray(["b"], mixed));
+prefix.apply(void 0, __spreadArray(["c"], tuple));
+rest.apply(void 0, __spreadArray(["e"], mixed));
+rest.apply(void 0, __spreadArray(["f"], tuple));
 prefix.apply(void 0, ns); // required parameters are required
 prefix.apply(void 0, mixed);
 prefix.apply(void 0, tuple);
-prefix2.apply(void 0, __spreadArrays(["g"], ns));
+prefix2.apply(void 0, __spreadArray(["g"], ns));

tests/baselines/reference/callWithSpread3.js

@@ -37,32 +37,30 @@ fs5(...s2, "foo", ...s2);
 
 
 //// [callWithSpread3.js]
-var __spreadArrays = (this && this.__spreadArrays) || function () {
-    for (var s = 0, i = 0, il = arguments.length; i < il; i++) s += arguments[i].length;
-    for (var r = Array(s), k = 0, i = 0; i < il; i++)
-        for (var a = arguments[i], j = 0, jl = a.length; j < jl; j++, k++)
-            r[k] = a[j];
-    return r;
+var __spreadArray = (this && this.__spreadArray) || function (to, from) {
+    for (var i = 0, il = from.length, j = to.length; i < il; i++, j++)
+        to[j] = from[i];
+    return to;
 };
 // error
-fs2.apply(void 0, __spreadArrays(['a'], s2)); // error on ...s2
-fs2.apply(void 0, __spreadArrays(['a', 'b', 'c'], s2)); // error on 'c' and ...s2
-fs2.apply(void 0, __spreadArrays(['a', 'b'], s2, ['c'])); // error on ...s2 and 'c'
-fs2.apply(void 0, __spreadArrays(['a', 'b', 'c'], s2, ['d'])); // error on 'c', ...s2 and 'd'
-fs2.apply(void 0, __spreadArrays(s2, ['a'])); // error on 'a'
+fs2.apply(void 0, __spreadArray(['a'], s2)); // error on ...s2
+fs2.apply(void 0, __spreadArray(['a', 'b', 'c'], s2)); // error on 'c' and ...s2
+fs2.apply(void 0, __spreadArray(__spreadArray(['a', 'b'], s2), ['c'])); // error on ...s2 and 'c'
+fs2.apply(void 0, __spreadArray(__spreadArray(['a', 'b', 'c'], s2), ['d'])); // error on 'c', ...s2 and 'd'
+fs2.apply(void 0, __spreadArray(__spreadArray([], s2), ['a'])); // error on 'a'
 fs2.apply(void 0, s3); // error on ...s3
 fs2_.apply(void 0, s_); // error on ...s_
 fs2_.apply(void 0, s2n_); // error on ...s2n_
-fs2_.apply(void 0, __spreadArrays(s_, s_)); // error         FIXME: bad error message
-fs2_.apply(void 0, __spreadArrays(s_, s_, s_)); // error  FIXME: worse error message
+fs2_.apply(void 0, __spreadArray(__spreadArray([], s_), s_)); // error         FIXME: bad error message
+fs2_.apply(void 0, __spreadArray(__spreadArray(__spreadArray([], s_), s_), s_)); // error  FIXME: worse error message
 // fs2n_(...s2, ...s_); //           FIXME: should be a type error
 fs2n_.apply(void 0, s2_); // error on ...s2_
 // ok
 fs2_.apply(void 0, s2_);
-fs2_.apply(void 0, __spreadArrays(s2_, s_));
-fs2_.apply(void 0, __spreadArrays(s2_, s2_));
-fs2_.apply(void 0, __spreadArrays(s_, s2_));
+fs2_.apply(void 0, __spreadArray(__spreadArray([], s2_), s_));
+fs2_.apply(void 0, __spreadArray(__spreadArray([], s2_), s2_));
+fs2_.apply(void 0, __spreadArray(__spreadArray([], s_), s2_));
 fs2n_.apply(void 0, s2n_);
 fs2n_.apply(void 0, s2);
 // fs2n_(...s2, ...n_); // FIXME: should compile
-fs5.apply(void 0, __spreadArrays(s2, ["foo"], s2));
+fs5.apply(void 0, __spreadArray(__spreadArray(__spreadArray([], s2), ["foo"]), s2));

tests/baselines/reference/destructuringArrayBindingPatternAndAssignment1ES5.js

@@ -70,12 +70,10 @@ var [c14, c15, c16] = [1, 2, "string"];
  * AssignmentRestElement:
  *      ...   LeftHandSideExpression
  */
-var __spreadArrays = (this && this.__spreadArrays) || function () {
-    for (var s = 0, i = 0, il = arguments.length; i < il; i++) s += arguments[i].length;
-    for (var r = Array(s), k = 0, i = 0; i < il; i++)
-        for (var a = arguments[i], j = 0, jl = a.length; j < jl; j++, k++)
-            r[k] = a[j];
-    return r;
+var __spreadArray = (this && this.__spreadArray) || function (to, from) {
+    for (var i = 0, il = from.length, j = to.length; i < il; i++, j++)
+        to[j] = from[i];
+    return to;
 };
 // In a destructuring assignment expression, the type of the expression on the right must be assignable to the assignment target on the left.
 // An expression of type S is considered assignable to an assignment target V if one of the following is true
@@ -95,7 +93,7 @@ var _e = foo(), b6 = _e[0], b7 = _e[1];
 var b8 = foo().slice(0);
 //      S is not a tuple- like type and the numeric index signature type of S is assignable to the target given in E.
 var temp = [1, 2, 3];
-var _f = __spreadArrays(temp), c0 = _f[0], c1 = _f[1];
+var _f = __spreadArray([], temp), c0 = _f[0], c1 = _f[1];
 var c2 = [][0];
 var _g = [[[]], [[[[]]]]], c3 = _g[0][0][0], c4 = _g[1][0][0][0][0];
 var _h = [[1], true], c5 = _h[0][0], c6 = _h[1];

tests/baselines/reference/destructuringArrayBindingPatternAndAssignment1ES5iterable.js

@@ -86,9 +86,10 @@ var __read = (this && this.__read) || function (o, n) {
     }
     return ar;
 };
-var __spread = (this && this.__spread) || function () {
-    for (var ar = [], i = 0; i < arguments.length; i++) ar = ar.concat(__read(arguments[i]));
-    return ar;
+var __spreadArray = (this && this.__spreadArray) || function (to, from) {
+    for (var i = 0, il = from.length, j = to.length; i < il; i++, j++)
+        to[j] = from[i];
+    return to;
 };
 // In a destructuring assignment expression, the type of the expression on the right must be assignable to the assignment target on the left.
 // An expression of type S is considered assignable to an assignment target V if one of the following is true
@@ -108,7 +109,7 @@ var _g = __read(foo(), 2), b6 = _g[0], b7 = _g[1];
 var _h = __read(foo()), b8 = _h.slice(0);
 //      S is not a tuple- like type and the numeric index signature type of S is assignable to the target given in E.
 var temp = [1, 2, 3];
-var _j = __read(__spread(temp), 2), c0 = _j[0], c1 = _j[1];
+var _j = __read(__spreadArray([], __read(temp)), 2), c0 = _j[0], c1 = _j[1];
 var _k = __read([], 1), c2 = _k[0];
 var _l = __read([[[]], [[[[]]]]], 2), _m = __read(_l[0], 1), _o = __read(_m[0], 1), c3 = _o[0], _p = __read(_l[1], 1), _q = __read(_p[0], 1), _r = __read(_q[0], 1), _s = __read(_r[0], 1), c4 = _s[0];
 var _t = __read([[1], true], 2), _u = __read(_t[0], 1), c5 = _u[0], c6 = _t[1];

tests/baselines/reference/destructuringArrayBindingPatternAndAssignment2.js

@@ -35,12 +35,10 @@ function foo(idx: number): F {
 var [c4, c5, c6] = foo(1);  // Error
 
 //// [destructuringArrayBindingPatternAndAssignment2.js]
-var __spreadArrays = (this && this.__spreadArrays) || function () {
-    for (var s = 0, i = 0, il = arguments.length; i < il; i++) s += arguments[i].length;
-    for (var r = Array(s), k = 0, i = 0; i < il; i++)
-        for (var a = arguments[i], j = 0, jl = a.length; j < jl; j++, k++)
-            r[k] = a[j];
-    return r;
+var __spreadArray = (this && this.__spreadArray) || function (to, from) {
+    for (var i = 0, il = from.length, j = to.length; i < il; i++, j++)
+        to[j] = from[i];
+    return to;
 };
 // V is an array assignment pattern, S is the type Any or an array-like type (section 3.3.2), and, for each assignment element E in V,
 //      S is the type Any, or
@@ -57,8 +55,8 @@ var _c = bar(), _d = _c[0], b3 = _d === void 0 ? "string" : _d, b4 = _c[1], b5 =
 // V is an array assignment pattern, S is the type Any or an array-like type (section 3.3.2), and, for each assignment element E in V,
 //      S is not a tuple- like type and the numeric index signature type of S is assignable to the target given in E.
 var temp = [1, 2, 3];
-var _e = __spreadArrays(temp), c0 = _e[0], c1 = _e[1]; // Error
-var _f = __spreadArrays(temp), c2 = _f[0], c3 = _f[1]; // Error
+var _e = __spreadArray([], temp), c0 = _e[0], c1 = _e[1]; // Error
+var _f = __spreadArray([], temp), c2 = _f[0], c3 = _f[1]; // Error
 function foo(idx) {
     return {
         2: true

tests/baselines/reference/destructuringParameterDeclaration3ES5iterable.js

@@ -64,9 +64,10 @@ var __read = (this && this.__read) || function (o, n) {
     }
     return ar;
 };
-var __spread = (this && this.__spread) || function () {
-    for (var ar = [], i = 0; i < arguments.length; i++) ar = ar.concat(__read(arguments[i]));
-    return ar;
+var __spreadArray = (this && this.__spreadArray) || function (to, from) {
+    for (var i = 0, il = from.length, j = to.length; i < il; i++, j++)
+        to[j] = from[i];
+    return to;
 };
 function a1() {
     var x = [];
@@ -109,8 +110,8 @@ function a11(_a) {
 }
 var array = [1, 2, 3];
 var array2 = [true, false, "hello"];
-a2(__spread(array));
-a1.apply(void 0, __spread(array));
+a2(__spreadArray([], __read(array)));
+a1.apply(void 0, __spreadArray([], __read(array)));
 a9([1, 2, [["string"]], false, true]); // Parameter type is [any, any, [[any]]]
 a10([1, 2, [["string"]], false, true]); // Parameter type is any[]
 a10([1, 2, 3, false, true]); // Parameter type is any[]

tests/baselines/reference/destructuringVariableDeclaration1ES5.js

@@ -42,12 +42,10 @@ var {h: {h1 = [undefined, null]}}: { h: { h1: number[] } } = { h: { h1: [1, 2] }
 
 
 //// [destructuringVariableDeclaration1ES5.js]
-var __spreadArrays = (this && this.__spreadArrays) || function () {
-    for (var s = 0, i = 0, il = arguments.length; i < il; i++) s += arguments[i].length;
-    for (var r = Array(s), k = 0, i = 0; i < il; i++)
-        for (var a = arguments[i], j = 0, jl = a.length; j < jl; j++, k++)
-            r[k] = a[j];
-    return r;
+var __spreadArray = (this && this.__spreadArray) || function (to, from) {
+    for (var i = 0, il = from.length, j = to.length; i < il; i++, j++)
+        to[j] = from[i];
+    return to;
 };
 // The type T associated with a destructuring variable declaration is determined as follows:
 //      If the declaration includes a type annotation, T is that type.
@@ -73,7 +71,7 @@ var _o = [1, "string"], d1 = _o[0], d2 = _o[1];
 //      Otherwise, if S is a tuple- like type (section 3.3.3):
 //              Otherwise, if S has a numeric index signature, T is the type of the numeric index signature.
 var temp1 = [true, false, true];
-var _p = __spreadArrays([1, "string"], temp1), d3 = _p[0], d4 = _p[1];
+var _p = __spreadArray([1, "string"], temp1), d3 = _p[0], d4 = _p[1];
 //  Combining both forms of destructuring,
 var _q = { e: [1, 2, { b1: 4, b4: 0 }] }.e, e1 = _q[0], e2 = _q[1], _r = _q[2], e3 = _r === void 0 ? { b1: 1000, b4: 200 } : _r;
 var _s = { f: [1, 2, { f3: 4, f5: 0 }] }.f, f1 = _s[0], f2 = _s[1], _t = _s[2], f4 = _t.f3, f5 = _t.f5;

tests/baselines/reference/destructuringVariableDeclaration1ES5iterable.js

@@ -58,9 +58,10 @@ var __read = (this && this.__read) || function (o, n) {
     }
     return ar;
 };
-var __spread = (this && this.__spread) || function () {
-    for (var ar = [], i = 0; i < arguments.length; i++) ar = ar.concat(__read(arguments[i]));
-    return ar;
+var __spreadArray = (this && this.__spreadArray) || function (to, from) {
+    for (var i = 0, il = from.length, j = to.length; i < il; i++, j++)
+        to[j] = from[i];
+    return to;
 };
 // The type T associated with a destructuring variable declaration is determined as follows:
 //      If the declaration includes a type annotation, T is that type.
@@ -86,7 +87,7 @@ var _s = __read([1, "string"], 2), d1 = _s[0], d2 = _s[1];
 //      Otherwise, if S is a tuple- like type (section 3.3.3):
 //              Otherwise, if S has a numeric index signature, T is the type of the numeric index signature.
 var temp1 = [true, false, true];
-var _t = __read(__spread([1, "string"], temp1), 2), d3 = _t[0], d4 = _t[1];
+var _t = __read(__spreadArray([1, "string"], __read(temp1)), 2), d3 = _t[0], d4 = _t[1];
 //  Combining both forms of destructuring,
 var _u = __read({ e: [1, 2, { b1: 4, b4: 0 }] }.e, 3), e1 = _u[0], e2 = _u[1], _v = _u[2], e3 = _v === void 0 ? { b1: 1000, b4: 200 } : _v;
 var _w = __read({ f: [1, 2, { f3: 4, f5: 0 }] }.f, 4), f1 = _w[0], f2 = _w[1], _x = _w[2], f4 = _x.f3, f5 = _x.f5;

tests/baselines/reference/es5-asyncFunctionArrayLiterals.js

@@ -63,11 +63,14 @@ function arrayLiteral1() {
 }
 function arrayLiteral2() {
     return __awaiter(this, void 0, void 0, function () {
-        return __generator(this, function (_a) {
-            switch (_a.label) {
-                case 0: return [4 /*yield*/, y];
+        var _a;
+        return __generator(this, function (_b) {
+            switch (_b.label) {
+                case 0:
+                    _a = [[]];
+                    return [4 /*yield*/, y];
                 case 1:
-                    x = __spreadArrays.apply(void 0, [(_a.sent()), [z]]);
+                    x = __spreadArray.apply(void 0, [__spreadArray.apply(void 0, _a.concat([(_b.sent())])), [z]]);
                     return [2 /*return*/];
             }
         });
@@ -79,10 +82,10 @@ function arrayLiteral3() {
         return __generator(this, function (_b) {
             switch (_b.label) {
                 case 0:
-                    _a = [y];
+                    _a = [__spreadArray([], y)];
                     return [4 /*yield*/, z];
                 case 1:
-                    x = __spreadArrays.apply(void 0, _a.concat([[_b.sent()]]));
+                    x = __spreadArray.apply(void 0, _a.concat([[_b.sent()]]));
                     return [2 /*return*/];
             }
         });
@@ -94,7 +97,7 @@ function arrayLiteral4() {
             switch (_a.label) {
                 case 0: return [4 /*yield*/, y];
                 case 1:
-                    x = __spreadArrays.apply(void 0, [[_a.sent()], z]);
+                    x = __spreadArray.apply(void 0, [[_a.sent()], z]);
                     return [2 /*return*/];
             }
         });
@@ -109,7 +112,7 @@ function arrayLiteral5() {
                     _a = [[y]];
                     return [4 /*yield*/, z];
                 case 1:
-                    x = __spreadArrays.apply(void 0, _a.concat([(_b.sent())]));
+                    x = __spreadArray.apply(void 0, _a.concat([(_b.sent())]));
                     return [2 /*return*/];
             }
         });

tests/baselines/reference/es5-asyncFunctionCallExpressions.js

@@ -146,7 +146,7 @@ function callExpression4() {
     return __awaiter(this, void 0, void 0, function () {
         return __generator(this, function (_a) {
             switch (_a.label) {
-                case 0: return [4 /*yield*/, x.apply(void 0, __spreadArrays(y, [z]))];
+                case 0: return [4 /*yield*/, x.apply(void 0, __spreadArray(__spreadArray([], y), [z]))];
                 case 1:
                     _a.sent();
                     return [2 /*return*/];
@@ -160,7 +160,7 @@ function callExpression5() {
             switch (_a.label) {
                 case 0: return [4 /*yield*/, x];
                 case 1:
-                    (_a.sent()).apply(void 0, __spreadArrays(y, [z]));
+                    (_a.sent()).apply(void 0, __spreadArray(__spreadArray([], y), [z]));
                     return [2 /*return*/];
             }
         });
@@ -168,15 +168,16 @@ function callExpression5() {
 }
 function callExpression6() {
     return __awaiter(this, void 0, void 0, function () {
-        var _a, _b, _c;
-        return __generator(this, function (_d) {
-            switch (_d.label) {
+        var _a, _b, _c, _d;
+        return __generator(this, function (_e) {
+            switch (_e.label) {
                 case 0:
                     _b = (_a = x).apply;
                     _c = [void 0];
+                    _d = [[]];
                     return [4 /*yield*/, y];
                 case 1:
-                    _b.apply(_a, _c.concat([__spreadArrays.apply(void 0, [(_d.sent()), [z]])]));
+                    _b.apply(_a, _c.concat([__spreadArray.apply(void 0, [__spreadArray.apply(void 0, _d.concat([(_e.sent())])), [z]])]));
                     return [2 /*return*/];
             }
         });
@@ -190,10 +191,10 @@ function callExpression7() {
                 case 0:
                     _b = (_a = x).apply;
                     _c = [void 0];
-                    _d = [y];
+                    _d = [__spreadArray([], y)];
                     return [4 /*yield*/, z];
                 case 1:
-                    _b.apply(_a, _c.concat([__spreadArrays.apply(void 0, _d.concat([[_e.sent()]]))]));
+                    _b.apply(_a, _c.concat([__spreadArray.apply(void 0, _d.concat([[_e.sent()]]))]));
                     return [2 /*return*/];
             }
         });
@@ -209,7 +210,7 @@ function callExpression8() {
                     _c = [void 0];
                     return [4 /*yield*/, y];
                 case 1:
-                    _b.apply(_a, _c.concat([__spreadArrays.apply(void 0, [[_d.sent()], z])]));
+                    _b.apply(_a, _c.concat([__spreadArray.apply(void 0, [[_d.sent()], z])]));
                     return [2 /*return*/];
             }
         });
@@ -226,7 +227,7 @@ function callExpression9() {
                     _d = [[y]];
                     return [4 /*yield*/, z];
                 case 1:
-                    _b.apply(_a, _c.concat([__spreadArrays.apply(void 0, _d.concat([(_e.sent())]))]));
+                    _b.apply(_a, _c.concat([__spreadArray.apply(void 0, _d.concat([(_e.sent())]))]));
                     return [2 /*return*/];
             }
         });

tests/baselines/reference/es5-asyncFunctionNewExpressions.js

@@ -145,7 +145,7 @@ function newExpression4() {
     return __awaiter(this, void 0, void 0, function () {
         return __generator(this, function (_a) {
             switch (_a.label) {
-                case 0: return [4 /*yield*/, new (x.bind.apply(x, __spreadArrays([void 0], y, [z])))()];
+                case 0: return [4 /*yield*/, new (x.bind.apply(x, __spreadArray(__spreadArray([void 0], y), [z])))()];
                 case 1:
                     _a.sent();
                     return [2 /*return*/];
@@ -160,7 +160,7 @@ function newExpression5() {
             switch (_b.label) {
                 case 0: return [4 /*yield*/, x];
                 case 1:
-                    new ((_a = (_b.sent())).bind.apply(_a, __spreadArrays([void 0], y, [z])))();
+                    new ((_a = (_b.sent())).bind.apply(_a, __spreadArray(__spreadArray([void 0], y), [z])))();
                     return [2 /*return*/];
             }
         });
@@ -177,7 +177,7 @@ function newExpression6() {
                     _d = [[void 0]];
                     return [4 /*yield*/, y];
                 case 1:
-                    new (_b.apply(_a, _c.concat([__spreadArrays.apply(void 0, _d.concat([(_e.sent()), [z]]))])))();
+                    new (_b.apply(_a, _c.concat([__spreadArray.apply(void 0, [__spreadArray.apply(void 0, _d.concat([(_e.sent())])), [z]])])))();
                     return [2 /*return*/];
             }
         });
@@ -191,10 +191,10 @@ function newExpression7() {
                 case 0:
                     _b = (_a = x.bind).apply;
                     _c = [x];
-                    _d = [[void 0], y];
+                    _d = [__spreadArray([void 0], y)];
                     return [4 /*yield*/, z];
                 case 1:
-                    new (_b.apply(_a, _c.concat([__spreadArrays.apply(void 0, _d.concat([[_e.sent()]]))])))();
+                    new (_b.apply(_a, _c.concat([__spreadArray.apply(void 0, _d.concat([[_e.sent()]]))])))();
                     return [2 /*return*/];
             }
         });
@@ -211,7 +211,7 @@ function newExpression8() {
                     _d = [void 0];
                     return [4 /*yield*/, y];
                 case 1:
-                    new (_b.apply(_a, _c.concat([__spreadArrays.apply(void 0, [_d.concat([_e.sent()]), z])])))();
+                    new (_b.apply(_a, _c.concat([__spreadArray.apply(void 0, [_d.concat([_e.sent()]), z])])))();
                     return [2 /*return*/];
             }
         });
@@ -228,7 +228,7 @@ function newExpression9() {
                     _d = [[void 0, y]];
                     return [4 /*yield*/, z];
                 case 1:
-                    new (_b.apply(_a, _c.concat([__spreadArrays.apply(void 0, _d.concat([(_e.sent())]))])))();
+                    new (_b.apply(_a, _c.concat([__spreadArray.apply(void 0, _d.concat([(_e.sent())]))])))();
                     return [2 /*return*/];
             }
         });

tests/baselines/reference/genericRestParameters1.js

@@ -167,60 +167,58 @@ ff1 = ff4;  // Error
 
 //// [genericRestParameters1.js]
 "use strict";
-var __spreadArrays = (this && this.__spreadArrays) || function () {
-    for (var s = 0, i = 0, il = arguments.length; i < il; i++) s += arguments[i].length;
-    for (var r = Array(s), k = 0, i = 0; i < il; i++)
-        for (var a = arguments[i], j = 0, jl = a.length; j < jl; j++, k++)
-            r[k] = a[j];
-    return r;
+var __spreadArray = (this && this.__spreadArray) || function (to, from) {
+    for (var i = 0, il = from.length, j = to.length; i < il; i++, j++)
+        to[j] = from[i];
+    return to;
 };
 f1 = f2;
 f2 = f1;
 f1(42, "hello", true);
 f1(t3[0], t3[1], t3[2]);
 f1.apply(void 0, t3);
-f1.apply(void 0, __spreadArrays([42], t2));
-f1.apply(void 0, __spreadArrays([42, "hello"], t1));
-f1.apply(void 0, __spreadArrays([42, "hello", true], t0));
+f1.apply(void 0, __spreadArray([42], t2));
+f1.apply(void 0, __spreadArray([42, "hello"], t1));
+f1.apply(void 0, __spreadArray([42, "hello", true], t0));
 f1(ns[0], ns[1], true);
-f1.apply(void 0, __spreadArrays(ns, [true])); // FIXME: Error, since ...ns is considered as string|number here
+f1.apply(void 0, __spreadArray(__spreadArray([], ns), [true])); // FIXME: Error, since ...ns is considered as string|number here
 f2(42, "hello", true);
 f2(t3[0], t3[1], t3[2]);
 f2.apply(void 0, t3);
-f2.apply(void 0, __spreadArrays([42], t2));
-f2.apply(void 0, __spreadArrays([42, "hello"], t1));
-f2.apply(void 0, __spreadArrays([42, "hello", true], t0));
+f2.apply(void 0, __spreadArray([42], t2));
+f2.apply(void 0, __spreadArray([42, "hello"], t1));
+f2.apply(void 0, __spreadArray([42, "hello", true], t0));
 f2(ns[0], ns[1], true);
-f2.apply(void 0, __spreadArrays(ns, [true])); // FIXME: Error, since ...ns is considered as string|number here
+f2.apply(void 0, __spreadArray(__spreadArray([], ns), [true])); // FIXME: Error, since ...ns is considered as string|number here
 var x10 = f10(42, "hello", true); // [number, string, boolean]
 var x11 = f10(42, "hello"); // [number, string]
 var x12 = f10(42); // [number]
 var x13 = f10(); // []
 var x14 = f10.apply(void 0, t3); // [number, string, boolean]
-var x15 = f10.apply(void 0, __spreadArrays([42], t2)); // [number, string, boolean]
-var x16 = f10.apply(void 0, __spreadArrays([42, "hello"], t1)); // [number, string, boolean]
-var x17 = f10.apply(void 0, __spreadArrays([42, "hello", true], t0)); // [number, string, boolean]
-var x18 = f10.apply(void 0, __spreadArrays(ns, [true])); // (string | number | boolean)[]
+var x15 = f10.apply(void 0, __spreadArray([42], t2)); // [number, string, boolean]
+var x16 = f10.apply(void 0, __spreadArray([42, "hello"], t1)); // [number, string, boolean]
+var x17 = f10.apply(void 0, __spreadArray([42, "hello", true], t0)); // [number, string, boolean]
+var x18 = f10.apply(void 0, __spreadArray(__spreadArray([], ns), [true])); // (string | number | boolean)[]
 function g10(u, v) {
     var x1 = f10.apply(void 0, u); // U
     var x2 = f10.apply(void 0, v); // V
-    var x3 = f10.apply(void 0, __spreadArrays([1], u)); // [number, ...string[]]
-    var x4 = f10.apply(void 0, __spreadArrays(u, v)); // (string | number)[]
+    var x3 = f10.apply(void 0, __spreadArray([1], u)); // [number, ...string[]]
+    var x4 = f10.apply(void 0, __spreadArray(__spreadArray([], u), v)); // (string | number)[]
 }
 var z10 = f11(42, "hello", true); // [42, "hello", true]
 var z11 = f11(42, "hello"); // [42, "hello"]
 var z12 = f11(42); // [42]
 var z13 = f11(); // []
 var z14 = f11.apply(void 0, t3); // [number, string, boolean]
-var z15 = f11.apply(void 0, __spreadArrays([42], t2)); // [42, string, boolean]
-var z16 = f11.apply(void 0, __spreadArrays([42, "hello"], t1)); // [42, "hello", boolean]
-var z17 = f11.apply(void 0, __spreadArrays([42, "hello", true], t0)); // [42, "hello", true]
-var z18 = f11.apply(void 0, __spreadArrays(ns, [true])); // (string | number | true)[]
+var z15 = f11.apply(void 0, __spreadArray([42], t2)); // [42, string, boolean]
+var z16 = f11.apply(void 0, __spreadArray([42, "hello"], t1)); // [42, "hello", boolean]
+var z17 = f11.apply(void 0, __spreadArray([42, "hello", true], t0)); // [42, "hello", true]
+var z18 = f11.apply(void 0, __spreadArray(__spreadArray([], ns), [true])); // (string | number | true)[]
 function g11(u, v) {
     var x1 = f11.apply(void 0, u); // U
     var x2 = f11.apply(void 0, v); // V
-    var x3 = f11.apply(void 0, __spreadArrays([1], u)); // [1, ...string[]]
-    var x4 = f11.apply(void 0, __spreadArrays(u, v)); // (string | number)[]
+    var x3 = f11.apply(void 0, __spreadArray([1], u)); // [1, ...string[]]
+    var x4 = f11.apply(void 0, __spreadArray(__spreadArray([], u), v)); // (string | number)[]
 }
 function call(f) {
     var args = [];
@@ -246,7 +244,7 @@ function bind(f, x) {
         for (var _i = 0; _i < arguments.length; _i++) {
             rest[_i] = arguments[_i];
         }
-        return f.apply(void 0, __spreadArrays([x], rest));
+        return f.apply(void 0, __spreadArray([x], rest));
     };
 }
 var f21 = bind(f20, 42); // (y: string, z: boolean) => string[]

tests/baselines/reference/genericRestParameters2.js

@@ -81,53 +81,51 @@ type T12 = P1<(x: number, y: number) => void>;
 
 //// [genericRestParameters2.js]
 "use strict";
-var __spreadArrays = (this && this.__spreadArrays) || function () {
-    for (var s = 0, i = 0, il = arguments.length; i < il; i++) s += arguments[i].length;
-    for (var r = Array(s), k = 0, i = 0; i < il; i++)
-        for (var a = arguments[i], j = 0, jl = a.length; j < jl; j++, k++)
-            r[k] = a[j];
-    return r;
+var __spreadArray = (this && this.__spreadArray) || function (to, from) {
+    for (var i = 0, il = from.length, j = to.length; i < il; i++, j++)
+        to[j] = from[i];
+    return to;
 };
 f10(42, "hello");
 f10(42, "hello", true);
 f10(42, "hello", true, false);
 f10(t1[0], t1[1], t1[2], t1[3]);
 f10.apply(void 0, t1);
-f10.apply(void 0, __spreadArrays([42], t2));
-f10.apply(void 0, __spreadArrays([42, "hello"], t3));
-f10.apply(void 0, __spreadArrays([42, "hello", true], t4));
-f10.apply(void 0, __spreadArrays([42, "hello", true], t4, [false], t3));
+f10.apply(void 0, __spreadArray([42], t2));
+f10.apply(void 0, __spreadArray([42, "hello"], t3));
+f10.apply(void 0, __spreadArray([42, "hello", true], t4));
+f10.apply(void 0, __spreadArray(__spreadArray(__spreadArray([42, "hello", true], t4), [false]), t3));
 f11(42, "hello");
 f11(42, "hello", true);
 f11(42, "hello", true, false);
 f11(t1[0], t1[1], t1[2], t1[3]);
 f11.apply(void 0, t1);
-f11.apply(void 0, __spreadArrays([42], t2));
-f11.apply(void 0, __spreadArrays([42, "hello"], t3));
-f11.apply(void 0, __spreadArrays([42, "hello", true], t4));
-f11.apply(void 0, __spreadArrays([42, "hello", true], t4, [false], t3));
+f11.apply(void 0, __spreadArray([42], t2));
+f11.apply(void 0, __spreadArray([42, "hello"], t3));
+f11.apply(void 0, __spreadArray([42, "hello", true], t4));
+f11.apply(void 0, __spreadArray(__spreadArray(__spreadArray([42, "hello", true], t4), [false]), t3));
 f12(42, "hello");
 f12(42, "hello", true);
 f12(42, "hello", true, false);
 f12(t1[0], t1[1], t1[2], t1[3]);
 f12.apply(void 0, t1);
-f12.apply(void 0, __spreadArrays([42], t2));
-f12.apply(void 0, __spreadArrays([42, "hello"], t3));
-f12.apply(void 0, __spreadArrays([42, "hello", true], t4));
-f12.apply(void 0, __spreadArrays([42, "hello", true], t4, [false], t3));
+f12.apply(void 0, __spreadArray([42], t2));
+f12.apply(void 0, __spreadArray([42, "hello"], t3));
+f12.apply(void 0, __spreadArray([42, "hello", true], t4));
+f12.apply(void 0, __spreadArray(__spreadArray(__spreadArray([42, "hello", true], t4), [false]), t3));
 f13(42, "hello");
 f13(42, "hello", true);
 f13(42, "hello", true, false);
 f13(t1[0], t1[1], t1[2], t1[3]);
 f13.apply(void 0, t1);
-f13.apply(void 0, __spreadArrays([42], t2));
-f13.apply(void 0, __spreadArrays([42, "hello"], t3));
-f13.apply(void 0, __spreadArrays([42, "hello", true], t4));
-f13.apply(void 0, __spreadArrays([42, "hello", true], t4, [false], t3));
+f13.apply(void 0, __spreadArray([42], t2));
+f13.apply(void 0, __spreadArray([42, "hello"], t3));
+f13.apply(void 0, __spreadArray([42, "hello", true], t4));
+f13.apply(void 0, __spreadArray(__spreadArray(__spreadArray([42, "hello", true], t4), [false]), t3));
 f20.apply(void 0, t1);
-f20.apply(void 0, __spreadArrays([42], t2));
-f20.apply(void 0, __spreadArrays([42, "hello"], t3));
-f20.apply(void 0, __spreadArrays([42, "hello"], t2, [true]));
+f20.apply(void 0, __spreadArray([42], t2));
+f20.apply(void 0, __spreadArray([42, "hello"], t3));
+f20.apply(void 0, __spreadArray(__spreadArray([42, "hello"], t2), [true]));
 
 
 //// [genericRestParameters2.d.ts]

tests/baselines/reference/genericRestParameters3.js

@@ -68,19 +68,17 @@ foo2(...x2);
 
 //// [genericRestParameters3.js]
 "use strict";
-var __spreadArrays = (this && this.__spreadArrays) || function () {
-    for (var s = 0, i = 0, il = arguments.length; i < il; i++) s += arguments[i].length;
-    for (var r = Array(s), k = 0, i = 0; i < il; i++)
-        for (var a = arguments[i], j = 0, jl = a.length; j < jl; j++, k++)
-            r[k] = a[j];
-    return r;
+var __spreadArray = (this && this.__spreadArray) || function (to, from) {
+    for (var i = 0, il = from.length, j = to.length; i < il; i++, j++)
+        to[j] = from[i];
+    return to;
 };
 f1("foo", "abc");
 f1("foo", 10, true);
-f1.apply(void 0, __spreadArrays(["foo"], t1));
-f1.apply(void 0, __spreadArrays(["foo"], t2));
-f1.apply(void 0, __spreadArrays(["foo"], t3));
-f1.apply(void 0, __spreadArrays(["foo"], t4));
+f1.apply(void 0, __spreadArray(["foo"], t1));
+f1.apply(void 0, __spreadArray(["foo"], t2));
+f1.apply(void 0, __spreadArray(["foo"], t3));
+f1.apply(void 0, __spreadArray(["foo"], t4));
 f1("foo", 10); // Error
 f1("foo"); // Error
 f2 = f1;

tests/baselines/reference/keyofAndIndexedAccess.js

@@ -674,12 +674,10 @@ var __extends = (this && this.__extends) || (function () {
         d.prototype = b === null ? Object.create(b) : (__.prototype = b.prototype, new __());
     };
 })();
-var __spreadArrays = (this && this.__spreadArrays) || function () {
-    for (var s = 0, i = 0, il = arguments.length; i < il; i++) s += arguments[i].length;
-    for (var r = Array(s), k = 0, i = 0; i < il; i++)
-        for (var a = arguments[i], j = 0, jl = a.length; j < jl; j++, k++)
-            r[k] = a[j];
-    return r;
+var __spreadArray = (this && this.__spreadArray) || function (to, from) {
+    for (var i = 0, il = from.length, j = to.length; i < il; i++, j++)
+        to[j] = from[i];
+    return to;
 };
 var Shape = /** @class */ (function () {
     function Shape() {
@@ -960,7 +958,7 @@ function f1(thing) {
     var x1 = path(thing, 'a'); // { x: number, y: string }
     var x2 = path(thing, 'a', 'y'); // string
     var x3 = path(thing, 'b'); // boolean
-    var x4 = path.apply(void 0, __spreadArrays([thing], ['a', 'x'])); // any
+    var x4 = path.apply(void 0, __spreadArray([thing], ['a', 'x'])); // any
 }
 // Repro from comment in #12114
 var assignTo2 = function (object, key1, key2) {

tests/baselines/reference/literalFreshnessPropagationOnNarrowing.js

@@ -62,12 +62,10 @@ function f5() {
 }
 
 //// [literalFreshnessPropagationOnNarrowing.js]
-var __spreadArrays = (this && this.__spreadArrays) || function () {
-    for (var s = 0, i = 0, il = arguments.length; i < il; i++) s += arguments[i].length;
-    for (var r = Array(s), k = 0, i = 0; i < il; i++)
-        for (var a = arguments[i], j = 0, jl = a.length; j < jl; j++, k++)
-            r[k] = a[j];
-    return r;
+var __spreadArray = (this && this.__spreadArray) || function (to, from) {
+    for (var i = 0, il = from.length, j = to.length; i < il; i++, j++)
+        to[j] = from[i];
+    return to;
 };
 function f1() {
     var b = true;
@@ -90,7 +88,7 @@ function f2() {
     // Desired: OK
     // 3.0: Error
     // 3.1: OK
-    var a5 = __spreadArrays(Array.isArray(elOrA) ? elOrA : [elOrA]);
+    var a5 = __spreadArray([], Array.isArray(elOrA) ? elOrA : [elOrA]);
 }
 function f3() {
     var x = 'x';

tests/baselines/reference/newWithSpread.js

@@ -97,12 +97,10 @@ new i["a-b"][1](1, 2, ...a);
 new i["a-b"][1](1, 2, ...a, "string");
 
 //// [newWithSpread.js]
-var __spreadArrays = (this && this.__spreadArrays) || function () {
-    for (var s = 0, i = 0, il = arguments.length; i < il; i++) s += arguments[i].length;
-    for (var r = Array(s), k = 0, i = 0; i < il; i++)
-        for (var a = arguments[i], j = 0, jl = a.length; j < jl; j++, k++)
-            r[k] = a[j];
-    return r;
+var __spreadArray = (this && this.__spreadArray) || function (to, from) {
+    for (var i = 0, il = from.length, j = to.length; i < il; i++, j++)
+        to[j] = from[i];
+    return to;
 };
 var _a, _b, _c, _d, _e, _f, _g, _h, _j, _k, _l, _m, _o, _p, _q, _r, _s, _t;
 function f(x, y) {
@@ -136,52 +134,52 @@ var h;
 var i;
 // Basic expression
 new f(1, 2, "string");
-new (f.bind.apply(f, __spreadArrays([void 0, 1, 2], a)))();
-new (f.bind.apply(f, __spreadArrays([void 0, 1, 2], a, ["string"])))();
+new (f.bind.apply(f, __spreadArray([void 0, 1, 2], a)))();
+new (f.bind.apply(f, __spreadArray(__spreadArray([void 0, 1, 2], a), ["string"])))();
 // Multiple spreads arguments
-new (f2.bind.apply(f2, __spreadArrays([void 0], a, a)))();
-new (f.bind.apply(f, __spreadArrays([void 0, 1, 2], a, a)))();
+new (f2.bind.apply(f2, __spreadArray(__spreadArray([void 0], a), a)))();
+new (f.bind.apply(f, __spreadArray(__spreadArray([void 0, 1, 2], a), a)))();
 // Call expression
 new f(1, 2, "string")();
-new (f.bind.apply(f, __spreadArrays([void 0, 1, 2], a)))()();
-new (f.bind.apply(f, __spreadArrays([void 0, 1, 2], a, ["string"])))()();
+new (f.bind.apply(f, __spreadArray([void 0, 1, 2], a)))()();
+new (f.bind.apply(f, __spreadArray(__spreadArray([void 0, 1, 2], a), ["string"])))()();
 // Property access expression
 new b.f(1, 2, "string");
-new ((_a = b.f).bind.apply(_a, __spreadArrays([void 0, 1, 2], a)))();
-new ((_b = b.f).bind.apply(_b, __spreadArrays([void 0, 1, 2], a, ["string"])))();
+new ((_a = b.f).bind.apply(_a, __spreadArray([void 0, 1, 2], a)))();
+new ((_b = b.f).bind.apply(_b, __spreadArray(__spreadArray([void 0, 1, 2], a), ["string"])))();
 // Parenthesised expression
 new (b.f)(1, 2, "string");
-new ((_c = (b.f)).bind.apply(_c, __spreadArrays([void 0, 1, 2], a)))();
-new ((_d = (b.f)).bind.apply(_d, __spreadArrays([void 0, 1, 2], a, ["string"])))();
+new ((_c = (b.f)).bind.apply(_c, __spreadArray([void 0, 1, 2], a)))();
+new ((_d = (b.f)).bind.apply(_d, __spreadArray(__spreadArray([void 0, 1, 2], a), ["string"])))();
 // Element access expression
 new d[1].f(1, 2, "string");
-new ((_e = d[1].f).bind.apply(_e, __spreadArrays([void 0, 1, 2], a)))();
-new ((_f = d[1].f).bind.apply(_f, __spreadArrays([void 0, 1, 2], a, ["string"])))();
+new ((_e = d[1].f).bind.apply(_e, __spreadArray([void 0, 1, 2], a)))();
+new ((_f = d[1].f).bind.apply(_f, __spreadArray(__spreadArray([void 0, 1, 2], a), ["string"])))();
 // Element access expression with a punctuated key
 new e["a-b"].f(1, 2, "string");
-new ((_g = e["a-b"].f).bind.apply(_g, __spreadArrays([void 0, 1, 2], a)))();
-new ((_h = e["a-b"].f).bind.apply(_h, __spreadArrays([void 0, 1, 2], a, ["string"])))();
+new ((_g = e["a-b"].f).bind.apply(_g, __spreadArray([void 0, 1, 2], a)))();
+new ((_h = e["a-b"].f).bind.apply(_h, __spreadArray(__spreadArray([void 0, 1, 2], a), ["string"])))();
 // Basic expression
 new B(1, 2, "string");
-new (B.bind.apply(B, __spreadArrays([void 0, 1, 2], a)))();
-new (B.bind.apply(B, __spreadArrays([void 0, 1, 2], a, ["string"])))();
+new (B.bind.apply(B, __spreadArray([void 0, 1, 2], a)))();
+new (B.bind.apply(B, __spreadArray(__spreadArray([void 0, 1, 2], a), ["string"])))();
 // Property access expression
 new c["a-b"](1, 2, "string");
-new ((_j = c["a-b"]).bind.apply(_j, __spreadArrays([void 0, 1, 2], a)))();
-new ((_k = c["a-b"]).bind.apply(_k, __spreadArrays([void 0, 1, 2], a, ["string"])))();
+new ((_j = c["a-b"]).bind.apply(_j, __spreadArray([void 0, 1, 2], a)))();
+new ((_k = c["a-b"]).bind.apply(_k, __spreadArray(__spreadArray([void 0, 1, 2], a), ["string"])))();
 // Parenthesised expression
 new (c["a-b"])(1, 2, "string");
-new ((_l = (c["a-b"])).bind.apply(_l, __spreadArrays([void 0, 1, 2], a)))();
-new ((_m = (c["a-b"])).bind.apply(_m, __spreadArrays([void 0, 1, 2], a, ["string"])))();
+new ((_l = (c["a-b"])).bind.apply(_l, __spreadArray([void 0, 1, 2], a)))();
+new ((_m = (c["a-b"])).bind.apply(_m, __spreadArray(__spreadArray([void 0, 1, 2], a), ["string"])))();
 // Element access expression
 new g[1]["a-b"](1, 2, "string");
-new ((_o = g[1]["a-b"]).bind.apply(_o, __spreadArrays([void 0, 1, 2], a)))();
-new ((_p = g[1]["a-b"]).bind.apply(_p, __spreadArrays([void 0, 1, 2], a, ["string"])))();
+new ((_o = g[1]["a-b"]).bind.apply(_o, __spreadArray([void 0, 1, 2], a)))();
+new ((_p = g[1]["a-b"]).bind.apply(_p, __spreadArray(__spreadArray([void 0, 1, 2], a), ["string"])))();
 // Element access expression with a punctuated key
 new h["a-b"]["a-b"](1, 2, "string");
-new ((_q = h["a-b"]["a-b"]).bind.apply(_q, __spreadArrays([void 0, 1, 2], a)))();
-new ((_r = h["a-b"]["a-b"]).bind.apply(_r, __spreadArrays([void 0, 1, 2], a, ["string"])))();
+new ((_q = h["a-b"]["a-b"]).bind.apply(_q, __spreadArray([void 0, 1, 2], a)))();
+new ((_r = h["a-b"]["a-b"]).bind.apply(_r, __spreadArray(__spreadArray([void 0, 1, 2], a), ["string"])))();
 // Element access expression with a number
 new i["a-b"][1](1, 2, "string");
-new ((_s = i["a-b"][1]).bind.apply(_s, __spreadArrays([void 0, 1, 2], a)))();
-new ((_t = i["a-b"][1]).bind.apply(_t, __spreadArrays([void 0, 1, 2], a, ["string"])))();
+new ((_s = i["a-b"][1]).bind.apply(_s, __spreadArray([void 0, 1, 2], a)))();
+new ((_t = i["a-b"][1]).bind.apply(_t, __spreadArray(__spreadArray([void 0, 1, 2], a), ["string"])))();

tests/baselines/reference/newWithSpreadES5.js

@@ -96,12 +96,10 @@ new i["a-b"][1](1, 2, ...a);
 new i["a-b"][1](1, 2, ...a, "string");
 
 //// [newWithSpreadES5.js]
-var __spreadArrays = (this && this.__spreadArrays) || function () {
-    for (var s = 0, i = 0, il = arguments.length; i < il; i++) s += arguments[i].length;
-    for (var r = Array(s), k = 0, i = 0; i < il; i++)
-        for (var a = arguments[i], j = 0, jl = a.length; j < jl; j++, k++)
-            r[k] = a[j];
-    return r;
+var __spreadArray = (this && this.__spreadArray) || function (to, from) {
+    for (var i = 0, il = from.length, j = to.length; i < il; i++, j++)
+        to[j] = from[i];
+    return to;
 };
 var _a, _b, _c, _d, _e, _f, _g, _h, _j, _k, _l, _m, _o, _p, _q, _r, _s, _t;
 function f(x, y) {
@@ -135,52 +133,52 @@ var h;
 var i;
 // Basic expression
 new f(1, 2, "string");
-new (f.bind.apply(f, __spreadArrays([void 0, 1, 2], a)))();
-new (f.bind.apply(f, __spreadArrays([void 0, 1, 2], a, ["string"])))();
+new (f.bind.apply(f, __spreadArray([void 0, 1, 2], a)))();
+new (f.bind.apply(f, __spreadArray(__spreadArray([void 0, 1, 2], a), ["string"])))();
 // Multiple spreads arguments
-new (f2.bind.apply(f2, __spreadArrays([void 0], a, a)))();
-new (f.bind.apply(f, __spreadArrays([void 0, 1, 2], a, a)))();
+new (f2.bind.apply(f2, __spreadArray(__spreadArray([void 0], a), a)))();
+new (f.bind.apply(f, __spreadArray(__spreadArray([void 0, 1, 2], a), a)))();
 // Call expression
 new f(1, 2, "string")();
-new (f.bind.apply(f, __spreadArrays([void 0, 1, 2], a)))()();
-new (f.bind.apply(f, __spreadArrays([void 0, 1, 2], a, ["string"])))()();
+new (f.bind.apply(f, __spreadArray([void 0, 1, 2], a)))()();
+new (f.bind.apply(f, __spreadArray(__spreadArray([void 0, 1, 2], a), ["string"])))()();
 // Property access expression
 new b.f(1, 2, "string");
-new ((_a = b.f).bind.apply(_a, __spreadArrays([void 0, 1, 2], a)))();
-new ((_b = b.f).bind.apply(_b, __spreadArrays([void 0, 1, 2], a, ["string"])))();
+new ((_a = b.f).bind.apply(_a, __spreadArray([void 0, 1, 2], a)))();
+new ((_b = b.f).bind.apply(_b, __spreadArray(__spreadArray([void 0, 1, 2], a), ["string"])))();
 // Parenthesised expression
 new (b.f)(1, 2, "string");
-new ((_c = (b.f)).bind.apply(_c, __spreadArrays([void 0, 1, 2], a)))();
-new ((_d = (b.f)).bind.apply(_d, __spreadArrays([void 0, 1, 2], a, ["string"])))();
+new ((_c = (b.f)).bind.apply(_c, __spreadArray([void 0, 1, 2], a)))();
+new ((_d = (b.f)).bind.apply(_d, __spreadArray(__spreadArray([void 0, 1, 2], a), ["string"])))();
 // Element access expression
 new d[1].f(1, 2, "string");
-new ((_e = d[1].f).bind.apply(_e, __spreadArrays([void 0, 1, 2], a)))();
-new ((_f = d[1].f).bind.apply(_f, __spreadArrays([void 0, 1, 2], a, ["string"])))();
+new ((_e = d[1].f).bind.apply(_e, __spreadArray([void 0, 1, 2], a)))();
+new ((_f = d[1].f).bind.apply(_f, __spreadArray(__spreadArray([void 0, 1, 2], a), ["string"])))();
 // Element access expression with a punctuated key
 new e["a-b"].f(1, 2, "string");
-new ((_g = e["a-b"].f).bind.apply(_g, __spreadArrays([void 0, 1, 2], a)))();
-new ((_h = e["a-b"].f).bind.apply(_h, __spreadArrays([void 0, 1, 2], a, ["string"])))();
+new ((_g = e["a-b"].f).bind.apply(_g, __spreadArray([void 0, 1, 2], a)))();
+new ((_h = e["a-b"].f).bind.apply(_h, __spreadArray(__spreadArray([void 0, 1, 2], a), ["string"])))();
 // Basic expression
 new B(1, 2, "string");
-new (B.bind.apply(B, __spreadArrays([void 0, 1, 2], a)))();
-new (B.bind.apply(B, __spreadArrays([void 0, 1, 2], a, ["string"])))();
+new (B.bind.apply(B, __spreadArray([void 0, 1, 2], a)))();
+new (B.bind.apply(B, __spreadArray(__spreadArray([void 0, 1, 2], a), ["string"])))();
 // Property access expression
 new c["a-b"](1, 2, "string");
-new ((_j = c["a-b"]).bind.apply(_j, __spreadArrays([void 0, 1, 2], a)))();
-new ((_k = c["a-b"]).bind.apply(_k, __spreadArrays([void 0, 1, 2], a, ["string"])))();
+new ((_j = c["a-b"]).bind.apply(_j, __spreadArray([void 0, 1, 2], a)))();
+new ((_k = c["a-b"]).bind.apply(_k, __spreadArray(__spreadArray([void 0, 1, 2], a), ["string"])))();
 // Parenthesised expression
 new (c["a-b"])(1, 2, "string");
-new ((_l = (c["a-b"])).bind.apply(_l, __spreadArrays([void 0, 1, 2], a)))();
-new ((_m = (c["a-b"])).bind.apply(_m, __spreadArrays([void 0, 1, 2], a, ["string"])))();
+new ((_l = (c["a-b"])).bind.apply(_l, __spreadArray([void 0, 1, 2], a)))();
+new ((_m = (c["a-b"])).bind.apply(_m, __spreadArray(__spreadArray([void 0, 1, 2], a), ["string"])))();
 // Element access expression
 new g[1]["a-b"](1, 2, "string");
-new ((_o = g[1]["a-b"]).bind.apply(_o, __spreadArrays([void 0, 1, 2], a)))();
-new ((_p = g[1]["a-b"]).bind.apply(_p, __spreadArrays([void 0, 1, 2], a, ["string"])))();
+new ((_o = g[1]["a-b"]).bind.apply(_o, __spreadArray([void 0, 1, 2], a)))();
+new ((_p = g[1]["a-b"]).bind.apply(_p, __spreadArray(__spreadArray([void 0, 1, 2], a), ["string"])))();
 // Element access expression with a punctuated key
 new h["a-b"]["a-b"](1, 2, "string");
-new ((_q = h["a-b"]["a-b"]).bind.apply(_q, __spreadArrays([void 0, 1, 2], a)))();
-new ((_r = h["a-b"]["a-b"]).bind.apply(_r, __spreadArrays([void 0, 1, 2], a, ["string"])))();
+new ((_q = h["a-b"]["a-b"]).bind.apply(_q, __spreadArray([void 0, 1, 2], a)))();
+new ((_r = h["a-b"]["a-b"]).bind.apply(_r, __spreadArray(__spreadArray([void 0, 1, 2], a), ["string"])))();
 // Element access expression with a number
 new i["a-b"][1](1, 2, "string");
-new ((_s = i["a-b"][1]).bind.apply(_s, __spreadArrays([void 0, 1, 2], a)))();
-new ((_t = i["a-b"][1]).bind.apply(_t, __spreadArrays([void 0, 1, 2], a, ["string"])))();
+new ((_s = i["a-b"][1]).bind.apply(_s, __spreadArray([void 0, 1, 2], a)))();
+new ((_t = i["a-b"][1]).bind.apply(_t, __spreadArray(__spreadArray([void 0, 1, 2], a), ["string"])))();

tests/baselines/reference/noCrashOnNoLib.js

@@ -8,19 +8,17 @@ export function f() {
 
 //// [noCrashOnNoLib.js]
 "use strict";
-var __spreadArrays = (this && this.__spreadArrays) || function () {
-    for (var s = 0, i = 0, il = arguments.length; i < il; i++) s += arguments[i].length;
-    for (var r = Array(s), k = 0, i = 0; i < il; i++)
-        for (var a = arguments[i], j = 0, jl = a.length; j < jl; j++, k++)
-            r[k] = a[j];
-    return r;
+var __spreadArray = (this && this.__spreadArray) || function (to, from) {
+    for (var i = 0, il = from.length, j = to.length; i < il; i++, j++)
+        to[j] = from[i];
+    return to;
 };
 exports.__esModule = true;
 exports.f = void 0;
 function f() {
     var e;
     while (true) {
-        e = __spreadArrays((e || []));
+        e = __spreadArray([], (e || []));
     }
 }
 exports.f = f;

tests/baselines/reference/operationsAvailableOnPromisedType.js

@@ -73,12 +73,10 @@ var __asyncValues = (this && this.__asyncValues) || function (o) {
     function verb(n) { i[n] = o[n] && function (v) { return new Promise(function (resolve, reject) { v = o[n](v), settle(resolve, reject, v.done, v.value); }); }; }
     function settle(resolve, reject, d, v) { Promise.resolve(v).then(function(v) { resolve({ value: v, done: d }); }, reject); }
 };
-var __spreadArrays = (this && this.__spreadArrays) || function () {
-    for (var s = 0, i = 0, il = arguments.length; i < il; i++) s += arguments[i].length;
-    for (var r = Array(s), k = 0, i = 0; i < il; i++)
-        for (var a = arguments[i], j = 0, jl = a.length; j < jl; j++, k++)
-            r[k] = a[j];
-    return r;
+var __spreadArray = (this && this.__spreadArray) || function (to, from) {
+    for (var i = 0, il = from.length, j = to.length; i < il; i++, j++)
+        to[j] = from[i];
+    return to;
 };
 function fn(a, b, c, d, e, f, g) {
     var c_1, c_1_1;
@@ -96,7 +94,7 @@ function fn(a, b, c, d, e, f, g) {
                     b++;
                     --b;
                     a === b;
-                    __spreadArrays(c);
+                    __spreadArray([], c);
                     for (_i = 0, c_2 = c; _i < c_2.length; _i++) {
                         s = c_2[_i];
                         fn(b, b, c, d, e, f, g);

tests/baselines/reference/readonlyRestParameters.js

@@ -29,12 +29,10 @@ function f4(...args: readonly string[]) {
 
 //// [readonlyRestParameters.js]
 "use strict";
-var __spreadArrays = (this && this.__spreadArrays) || function () {
-    for (var s = 0, i = 0, il = arguments.length; i < il; i++) s += arguments[i].length;
-    for (var r = Array(s), k = 0, i = 0; i < il; i++)
-        for (var a = arguments[i], j = 0, jl = a.length; j < jl; j++, k++)
-            r[k] = a[j];
-    return r;
+var __spreadArray = (this && this.__spreadArray) || function (to, from) {
+    for (var i = 0, il = from.length, j = to.length; i < il; i++, j++)
+        to[j] = from[i];
+    return to;
 };
 function f0(a, b) {
     f0(a, b);
@@ -48,7 +46,7 @@ function f1() {
     }
     f0.apply(void 0, args); // Error
     f1('abc', 'def');
-    f1.apply(void 0, __spreadArrays(['abc'], args));
+    f1.apply(void 0, __spreadArray(['abc'], args));
     f1.apply(void 0, args);
 }
 function f2() {
@@ -58,10 +56,10 @@ function f2() {
     }
     f0.apply(void 0, args);
     f1('abc', 'def');
-    f1.apply(void 0, __spreadArrays(['abc'], args));
+    f1.apply(void 0, __spreadArray(['abc'], args));
     f1.apply(void 0, args);
     f2('abc', 'def');
-    f2.apply(void 0, __spreadArrays(['abc'], args)); // Error
+    f2.apply(void 0, __spreadArray(['abc'], args)); // Error
     f2.apply(void 0, args);
 }
 function f4() {

tests/baselines/reference/recursiveReverseMappedType.js

@@ -17,15 +17,13 @@ function a<T>(l: Recur<T>[]): void {
 //// [recursiveReverseMappedType.js]
 "use strict";
 // Repro from #38198
-var __spreadArrays = (this && this.__spreadArrays) || function () {
-    for (var s = 0, i = 0, il = arguments.length; i < il; i++) s += arguments[i].length;
-    for (var r = Array(s), k = 0, i = 0; i < il; i++)
-        for (var a = arguments[i], j = 0, jl = a.length; j < jl; j++, k++)
-            r[k] = a[j];
-    return r;
+var __spreadArray = (this && this.__spreadArray) || function (to, from) {
+    for (var i = 0, il = from.length, j = to.length; i < il; i++, j++)
+        to[j] = from[i];
+    return to;
 };
 function join(l) {
-    return __spreadArrays(['marker'], l);
+    return __spreadArray(['marker'], l);
 }
 function a(l) {
     var x = join(l);

tests/baselines/reference/recursiveTypeReferences1.js

@@ -132,12 +132,10 @@ function level(h: HTMLHeadingElement): number {
 
 //// [recursiveTypeReferences1.js]
 "use strict";
-var __spreadArrays = (this && this.__spreadArrays) || function () {
-    for (var s = 0, i = 0, il = arguments.length; i < il; i++) s += arguments[i].length;
-    for (var r = Array(s), k = 0, i = 0; i < il; i++)
-        for (var a = arguments[i], j = 0, jl = a.length; j < jl; j++, k++)
-            r[k] = a[j];
-    return r;
+var __spreadArray = (this && this.__spreadArray) || function (to, from) {
+    for (var i = 0, il = from.length, j = to.length; i < il; i++, j++)
+        to[j] = from[i];
+    return to;
 };
 var a0 = 1;
 var a1 = [1, [2, 3], [4, [5, [6, 7]]]];
@@ -187,7 +185,7 @@ function parse(node, index) {
     if (index === void 0) { index = []; }
     return html('ul', node.map(function (_a, i) {
         var el = _a[0], children = _a[1];
-        var idx = __spreadArrays(index, [i + 1]);
+        var idx = __spreadArray(__spreadArray([], index), [i + 1]);
         return html('li', [
             html('a', { href: "#" + el.id, rel: 'noopener', 'data-index': idx.join('.') }, el.textContent),
             children.length > 0 ? parse(children, idx) : frag()

tests/baselines/reference/restTuplesFromContextualTypes.js

@@ -101,12 +101,10 @@ const funcUnionTupleRest: TupleUnionFunc = (...params) => {
 
 //// [restTuplesFromContextualTypes.js]
 "use strict";
-var __spreadArrays = (this && this.__spreadArrays) || function () {
-    for (var s = 0, i = 0, il = arguments.length; i < il; i++) s += arguments[i].length;
-    for (var r = Array(s), k = 0, i = 0; i < il; i++)
-        for (var a = arguments[i], j = 0, jl = a.length; j < jl; j++, k++)
-            r[k] = a[j];
-    return r;
+var __spreadArray = (this && this.__spreadArray) || function (to, from) {
+    for (var i = 0, il = from.length, j = to.length; i < il; i++, j++)
+        to[j] = from[i];
+    return to;
 };
 (function (a, b, c) { }).apply(void 0, t1);
 (function () {
@@ -208,31 +206,31 @@ f2(function (a, b, c) {
         x[_i - 3] = arguments[_i];
     }
 });
-(function (a, b, c) { }).apply(void 0, __spreadArrays([1], t3));
+(function (a, b, c) { }).apply(void 0, __spreadArray([1], t3));
 (function () {
     var x = [];
     for (var _i = 0; _i < arguments.length; _i++) {
         x[_i] = arguments[_i];
     }
-}).apply(void 0, __spreadArrays([1], t3));
+}).apply(void 0, __spreadArray([1], t3));
 (function (a) {
     var x = [];
     for (var _i = 1; _i < arguments.length; _i++) {
         x[_i - 1] = arguments[_i];
     }
-}).apply(void 0, __spreadArrays([1], t3));
+}).apply(void 0, __spreadArray([1], t3));
 (function (a, b) {
     var x = [];
     for (var _i = 2; _i < arguments.length; _i++) {
         x[_i - 2] = arguments[_i];
     }
-}).apply(void 0, __spreadArrays([1], t3));
+}).apply(void 0, __spreadArray([1], t3));
 (function (a, b, c) {
     var x = [];
     for (var _i = 3; _i < arguments.length; _i++) {
         x[_i - 3] = arguments[_i];
     }
-}).apply(void 0, __spreadArrays([1], t3));
+}).apply(void 0, __spreadArray([1], t3));
 f3(function (a, b, c) { });
 f3(function () {
     var x = [];
@@ -270,13 +268,13 @@ function f4(t) {
         for (var _i = 1; _i < arguments.length; _i++) {
             x[_i - 1] = arguments[_i];
         }
-    }).apply(void 0, __spreadArrays([1], t));
+    }).apply(void 0, __spreadArray([1], t));
     (function (a) {
         var x = [];
         for (var _i = 1; _i < arguments.length; _i++) {
             x[_i - 1] = arguments[_i];
         }
-    }).apply(void 0, __spreadArrays([1, 2], t));
+    }).apply(void 0, __spreadArray([1, 2], t));
     function f(cb) { }
     f(function () {
         var x = [];

tests/baselines/reference/selfReferencingSpreadInLoop.js

@@ -6,15 +6,13 @@ for (const subcomponent of [1, 2, 3]) {
 
 
 //// [selfReferencingSpreadInLoop.js]
-var __spreadArrays = (this && this.__spreadArrays) || function () {
-    for (var s = 0, i = 0, il = arguments.length; i < il; i++) s += arguments[i].length;
-    for (var r = Array(s), k = 0, i = 0; i < il; i++)
-        for (var a = arguments[i], j = 0, jl = a.length; j < jl; j++, k++)
-            r[k] = a[j];
-    return r;
+var __spreadArray = (this && this.__spreadArray) || function (to, from) {
+    for (var i = 0, il = from.length, j = to.length; i < il; i++, j++)
+        to[j] = from[i];
+    return to;
 };
 var additional = [];
 for (var _i = 0, _a = [1, 2, 3]; _i < _a.length; _i++) {
     var subcomponent = _a[_i];
-    additional = __spreadArrays(additional, [subcomponent]);
+    additional = __spreadArray(__spreadArray([], additional), [subcomponent]);
 }

tests/baselines/reference/spliceTuples.js

@@ -25,22 +25,20 @@ k6 = [1, ...sbb_];
 
 
 //// [spliceTuples.js]
-var __spreadArrays = (this && this.__spreadArrays) || function () {
-    for (var s = 0, i = 0, il = arguments.length; i < il; i++) s += arguments[i].length;
-    for (var r = Array(s), k = 0, i = 0; i < il; i++)
-        for (var a = arguments[i], j = 0, jl = a.length; j < jl; j++, k++)
-            r[k] = a[j];
-    return r;
+var __spreadArray = (this && this.__spreadArray) || function (to, from) {
+    for (var i = 0, il = from.length, j = to.length; i < il; i++, j++)
+        to[j] = from[i];
+    return to;
 };
 var k1;
-k1 = __spreadArrays([1], sb);
+k1 = __spreadArray([1], sb);
 var k2;
-k2 = __spreadArrays([1], sb, [1]);
+k2 = __spreadArray(__spreadArray([1], sb), [1]);
 var k3;
-k3 = __spreadArrays([1], sb_);
+k3 = __spreadArray([1], sb_);
 var k4;
-k4 = __spreadArrays([1], sbb_);
+k4 = __spreadArray([1], sbb_);
 var k5;
-k5 = __spreadArrays([1], sbb_);
+k5 = __spreadArray([1], sbb_);
 var k6;
-k6 = __spreadArrays([1], sbb_);
+k6 = __spreadArray([1], sbb_);

tests/baselines/reference/spreadBooleanRespectsFreshness.js

@@ -8,11 +8,9 @@ declare let foo2: Foo;
 foo1 = [...Array.isArray(foo2) ? foo2 : [foo2]];
 
 //// [spreadBooleanRespectsFreshness.js]
-var __spreadArrays = (this && this.__spreadArrays) || function () {
-    for (var s = 0, i = 0, il = arguments.length; i < il; i++) s += arguments[i].length;
-    for (var r = Array(s), k = 0, i = 0; i < il; i++)
-        for (var a = arguments[i], j = 0, jl = a.length; j < jl; j++, k++)
-            r[k] = a[j];
-    return r;
+var __spreadArray = (this && this.__spreadArray) || function (to, from) {
+    for (var i = 0, il = from.length, j = to.length; i < il; i++, j++)
+        to[j] = from[i];
+    return to;
 };
-foo1 = __spreadArrays(Array.isArray(foo2) ? foo2 : [foo2]);
+foo1 = __spreadArray([], Array.isArray(foo2) ? foo2 : [foo2]);

tests/baselines/reference/tsbuild/outfile-concat/incremental-declaration-doesnt-change/multiple-emitHelpers-in-different-projects.js

@@ -468,9 +468,10 @@ var __read = (this && this.__read) || function (o, n) {
     }
     return ar;
 };
-var __spread = (this && this.__spread) || function () {
-    for (var ar = [], i = 0; i < arguments.length; i++) ar = ar.concat(__read(arguments[i]));
-    return ar;
+var __spreadArray = (this && this.__spreadArray) || function (to, from) {
+    for (var i = 0, il = from.length, j = to.length; i < il; i++, j++)
+        to[j] = from[i];
+    return to;
 };
 var s = "Hello, world";
 console.log(s);
@@ -495,7 +496,8 @@ function secondsecond_part1Spread() {
         b[_i] = arguments[_i];
     }
 }
-secondsecond_part1Spread.apply(void 0, __spread([10, 20, 30]));
+var secondsecond_part1_ar = [20, 30];
+secondsecond_part1Spread.apply(void 0, __spreadArray([10], __read(secondsecond_part1_ar)));
 var C = (function () {
     function C() {
     }
@@ -512,7 +514,7 @@ function forthirdthird_part1Rest() {
 //# sourceMappingURL=third-output.js.map
 
 //// [/src/third/thirdjs/output/third-output.js.map]
-{"version":3,"file":"third-output.js","sourceRoot":"","sources":["../../../first/first_PART1.ts","../../../first/first_part2.ts","../../../first/first_part3.ts","../../../second/second_part1.ts","../../../second/second_part2.ts","../../third_part1.ts"],"names":[],"mappings":";;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;AAIA,IAAM,CAAC,GAAG,cAAc,CAAC;AAMzB,OAAO,CAAC,GAAG,CAAC,CAAC,CAAC,CAAC;AACf,SAAS,uBAAuB;IAChC,IAAM,KAAiB,EAAE,CAAC,EAAE,EAAE,EAAE,CAAC,EAAE,EAAE,EAAE,EAAE,EAAE,EAAE,EAAE,EAAvC,CAAC,OAAA,EAAK,IAAI,cAAZ,KAAc,CAA2B,CAAC;AAChD,CAAC;AAAA,OAAO,CAAC,GAAG,CAAC,CAAC,CAAC,CAAC;ACbhB,OAAO,CAAC,GAAG,CAAC,CAAC,EAAE,CAAC,CAAC;ACAjB,SAAS,CAAC;IACN,OAAO,gBAAgB,CAAC;AAC5B,CAAC;ACED,IAAU,CAAC,CAMV;AAND,WAAU,CAAC;IACP,SAAS,CAAC;QACN,OAAO,CAAC,GAAG,CAAC,SAAS,CAAC,CAAC;IAC3B,CAAC;IAED,CAAC,EAAE,CAAC;AACR,CAAC,EANS,CAAC,KAAD,CAAC,QAMV;AAED,SAAS,wBAAwB;IAAC,WAAc;SAAd,UAAc,EAAd,qBAAc,EAAd,IAAc;QAAd,sBAAc;;AAAI,CAAC;AACrD,wBAAwB,wBAAI,CAAC,EAAE,EAAE,EAAE,EAAE,EAAE,CAAC,GAAE;ACb1C;IAAA;IAIA,CAAC;IAHG,uBAAW,GAAX;QACI,OAAO,CAAC,GAAG,CAAC,oBAAoB,CAAC,CAAC;IACtC,CAAC;IACL,QAAC;AAAD,CAAC,AAJD,IAIC;ACJD,IAAI,CAAC,GAAG,IAAI,CAAC,EAAE,CAAC;AAChB,CAAC,CAAC,WAAW,EAAE,CAAC;AAChB,SAAS,uBAAuB;IAChC,IAAM,KAAiB,EAAE,CAAC,EAAE,EAAE,EAAE,CAAC,EAAE,EAAE,EAAE,EAAE,EAAE,EAAE,EAAE,EAAvC,CAAC,OAAA,EAAK,IAAI,cAAZ,KAAc,CAA2B,CAAC;AAChD,CAAC"}
+{"version":3,"file":"third-output.js","sourceRoot":"","sources":["../../../first/first_PART1.ts","../../../first/first_part2.ts","../../../first/first_part3.ts","../../../second/second_part1.ts","../../../second/second_part2.ts","../../third_part1.ts"],"names":[],"mappings":";;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;AAIA,IAAM,CAAC,GAAG,cAAc,CAAC;AAMzB,OAAO,CAAC,GAAG,CAAC,CAAC,CAAC,CAAC;AACf,SAAS,uBAAuB;IAChC,IAAM,KAAiB,EAAE,CAAC,EAAE,EAAE,EAAE,CAAC,EAAE,EAAE,EAAE,EAAE,EAAE,EAAE,EAAE,EAAvC,CAAC,OAAA,EAAK,IAAI,cAAZ,KAAc,CAA2B,CAAC;AAChD,CAAC;AAAA,OAAO,CAAC,GAAG,CAAC,CAAC,CAAC,CAAC;ACbhB,OAAO,CAAC,GAAG,CAAC,CAAC,EAAE,CAAC,CAAC;ACAjB,SAAS,CAAC;IACN,OAAO,gBAAgB,CAAC;AAC5B,CAAC;ACED,IAAU,CAAC,CAMV;AAND,WAAU,CAAC;IACP,SAAS,CAAC;QACN,OAAO,CAAC,GAAG,CAAC,SAAS,CAAC,CAAC;IAC3B,CAAC;IAED,CAAC,EAAE,CAAC;AACR,CAAC,EANS,CAAC,KAAD,CAAC,QAMV;AAED,SAAS,wBAAwB;IAAC,WAAc;SAAd,UAAc,EAAd,qBAAc,EAAd,IAAc;QAAd,sBAAc;;AAAI,CAAC;AACrD,IAAM,qBAAqB,GAAG,CAAC,EAAE,EAAE,EAAE,CAAC,CAAC;AACvC,wBAAwB,8BAAC,EAAE,UAAK,qBAAqB,IAAE;ACdvD;IAAA;IAIA,CAAC;IAHG,uBAAW,GAAX;QACI,OAAO,CAAC,GAAG,CAAC,oBAAoB,CAAC,CAAC;IACtC,CAAC;IACL,QAAC;AAAD,CAAC,AAJD,IAIC;ACJD,IAAI,CAAC,GAAG,IAAI,CAAC,EAAE,CAAC;AAChB,CAAC,CAAC,WAAW,EAAE,CAAC;AAChB,SAAS,uBAAuB;IAChC,IAAM,KAAiB,EAAE,CAAC,EAAE,EAAE,EAAE,CAAC,EAAE,EAAE,EAAE,EAAE,EAAE,EAAE,EAAE,EAAvC,CAAC,OAAA,EAAK,IAAI,cAAZ,KAAc,CAA2B,CAAC;AAChD,CAAC"}
 
 //// [/src/third/thirdjs/output/third-output.js.map.baseline.txt]
 ===================================================================
@@ -552,9 +554,10 @@ sourceFile:../../../first/first_PART1.ts
 >>>    }
 >>>    return ar;
 >>>};
->>>var __spread = (this && this.__spread) || function () {
->>>    for (var ar = [], i = 0; i < arguments.length; i++) ar = ar.concat(__read(arguments[i]));
->>>    return ar;
+>>>var __spreadArray = (this && this.__spreadArray) || function (to, from) {
+>>>    for (var i = 0, il = from.length, j = to.length; i < il; i++, j++)
+>>>        to[j] = from[i];
+>>>    return to;
 >>>};
 >>>var s = "Hello, world";
 1 >
@@ -573,12 +576,12 @@ sourceFile:../../../first/first_PART1.ts
 4 >      = 
 5 >        "Hello, world"
 6 >                      ;
-1 >Emitted(32, 1) Source(5, 1) + SourceIndex(0)
-2 >Emitted(32, 5) Source(5, 7) + SourceIndex(0)
-3 >Emitted(32, 6) Source(5, 8) + SourceIndex(0)
-4 >Emitted(32, 9) Source(5, 11) + SourceIndex(0)
-5 >Emitted(32, 23) Source(5, 25) + SourceIndex(0)
-6 >Emitted(32, 24) Source(5, 26) + SourceIndex(0)
+1 >Emitted(33, 1) Source(5, 1) + SourceIndex(0)
+2 >Emitted(33, 5) Source(5, 7) + SourceIndex(0)
+3 >Emitted(33, 6) Source(5, 8) + SourceIndex(0)
+4 >Emitted(33, 9) Source(5, 11) + SourceIndex(0)
+5 >Emitted(33, 23) Source(5, 25) + SourceIndex(0)
+6 >Emitted(33, 24) Source(5, 26) + SourceIndex(0)
 ---
 >>>console.log(s);
 1 >
@@ -604,14 +607,14 @@ sourceFile:../../../first/first_PART1.ts
 6 >            s
 7 >             )
 8 >              ;
-1 >Emitted(33, 1) Source(11, 1) + SourceIndex(0)
-2 >Emitted(33, 8) Source(11, 8) + SourceIndex(0)
-3 >Emitted(33, 9) Source(11, 9) + SourceIndex(0)
-4 >Emitted(33, 12) Source(11, 12) + SourceIndex(0)
-5 >Emitted(33, 13) Source(11, 13) + SourceIndex(0)
-6 >Emitted(33, 14) Source(11, 14) + SourceIndex(0)
-7 >Emitted(33, 15) Source(11, 15) + SourceIndex(0)
-8 >Emitted(33, 16) Source(11, 16) + SourceIndex(0)
+1 >Emitted(34, 1) Source(11, 1) + SourceIndex(0)
+2 >Emitted(34, 8) Source(11, 8) + SourceIndex(0)
+3 >Emitted(34, 9) Source(11, 9) + SourceIndex(0)
+4 >Emitted(34, 12) Source(11, 12) + SourceIndex(0)
+5 >Emitted(34, 13) Source(11, 13) + SourceIndex(0)
+6 >Emitted(34, 14) Source(11, 14) + SourceIndex(0)
+7 >Emitted(34, 15) Source(11, 15) + SourceIndex(0)
+8 >Emitted(34, 16) Source(11, 16) + SourceIndex(0)
 ---
 >>>function forfirstfirst_PART1Rest() {
 1->
@@ -622,9 +625,9 @@ sourceFile:../../../first/first_PART1.ts
   >
 2 >function 
 3 >         forfirstfirst_PART1Rest
-1->Emitted(34, 1) Source(12, 1) + SourceIndex(0)
-2 >Emitted(34, 10) Source(12, 10) + SourceIndex(0)
-3 >Emitted(34, 33) Source(12, 33) + SourceIndex(0)
+1->Emitted(35, 1) Source(12, 1) + SourceIndex(0)
+2 >Emitted(35, 10) Source(12, 10) + SourceIndex(0)
+3 >Emitted(35, 33) Source(12, 33) + SourceIndex(0)
 ---
 >>>    var _a = { a: 10, b: 30, yy: 30 }, b = _a.b, rest = __rest(_a, ["b"]);
 1->^^^^
@@ -678,31 +681,31 @@ sourceFile:../../../first/first_PART1.ts
 23>                                                                   { b, ...rest }
 24>                                                                         = { a: 10, b: 30, yy: 30 }
 25>                                                                         ;
-1->Emitted(35, 5) Source(13, 1) + SourceIndex(0)
-2 >Emitted(35, 9) Source(13, 7) + SourceIndex(0)
-3 >Emitted(35, 14) Source(13, 24) + SourceIndex(0)
-4 >Emitted(35, 16) Source(13, 26) + SourceIndex(0)
-5 >Emitted(35, 17) Source(13, 27) + SourceIndex(0)
-6 >Emitted(35, 19) Source(13, 29) + SourceIndex(0)
-7 >Emitted(35, 21) Source(13, 31) + SourceIndex(0)
-8 >Emitted(35, 23) Source(13, 33) + SourceIndex(0)
-9 >Emitted(35, 24) Source(13, 34) + SourceIndex(0)
-10>Emitted(35, 26) Source(13, 36) + SourceIndex(0)
-11>Emitted(35, 28) Source(13, 38) + SourceIndex(0)
-12>Emitted(35, 30) Source(13, 40) + SourceIndex(0)
-13>Emitted(35, 32) Source(13, 42) + SourceIndex(0)
-14>Emitted(35, 34) Source(13, 44) + SourceIndex(0)
-15>Emitted(35, 36) Source(13, 46) + SourceIndex(0)
-16>Emitted(35, 38) Source(13, 48) + SourceIndex(0)
-17>Emitted(35, 40) Source(13, 9) + SourceIndex(0)
-18>Emitted(35, 41) Source(13, 10) + SourceIndex(0)
-19>Emitted(35, 48) Source(13, 10) + SourceIndex(0)
-20>Emitted(35, 50) Source(13, 15) + SourceIndex(0)
-21>Emitted(35, 54) Source(13, 19) + SourceIndex(0)
-22>Emitted(35, 68) Source(13, 7) + SourceIndex(0)
-23>Emitted(35, 73) Source(13, 21) + SourceIndex(0)
-24>Emitted(35, 74) Source(13, 48) + SourceIndex(0)
-25>Emitted(35, 75) Source(13, 49) + SourceIndex(0)
+1->Emitted(36, 5) Source(13, 1) + SourceIndex(0)
+2 >Emitted(36, 9) Source(13, 7) + SourceIndex(0)
+3 >Emitted(36, 14) Source(13, 24) + SourceIndex(0)
+4 >Emitted(36, 16) Source(13, 26) + SourceIndex(0)
+5 >Emitted(36, 17) Source(13, 27) + SourceIndex(0)
+6 >Emitted(36, 19) Source(13, 29) + SourceIndex(0)
+7 >Emitted(36, 21) Source(13, 31) + SourceIndex(0)
+8 >Emitted(36, 23) Source(13, 33) + SourceIndex(0)
+9 >Emitted(36, 24) Source(13, 34) + SourceIndex(0)
+10>Emitted(36, 26) Source(13, 36) + SourceIndex(0)
+11>Emitted(36, 28) Source(13, 38) + SourceIndex(0)
+12>Emitted(36, 30) Source(13, 40) + SourceIndex(0)
+13>Emitted(36, 32) Source(13, 42) + SourceIndex(0)
+14>Emitted(36, 34) Source(13, 44) + SourceIndex(0)
+15>Emitted(36, 36) Source(13, 46) + SourceIndex(0)
+16>Emitted(36, 38) Source(13, 48) + SourceIndex(0)
+17>Emitted(36, 40) Source(13, 9) + SourceIndex(0)
+18>Emitted(36, 41) Source(13, 10) + SourceIndex(0)
+19>Emitted(36, 48) Source(13, 10) + SourceIndex(0)
+20>Emitted(36, 50) Source(13, 15) + SourceIndex(0)
+21>Emitted(36, 54) Source(13, 19) + SourceIndex(0)
+22>Emitted(36, 68) Source(13, 7) + SourceIndex(0)
+23>Emitted(36, 73) Source(13, 21) + SourceIndex(0)
+24>Emitted(36, 74) Source(13, 48) + SourceIndex(0)
+25>Emitted(36, 75) Source(13, 49) + SourceIndex(0)
 ---
 >>>}
 1 >
@@ -711,8 +714,8 @@ sourceFile:../../../first/first_PART1.ts
 1 >
   >
 2 >}
-1 >Emitted(36, 1) Source(14, 1) + SourceIndex(0)
-2 >Emitted(36, 2) Source(14, 2) + SourceIndex(0)
+1 >Emitted(37, 1) Source(14, 1) + SourceIndex(0)
+2 >Emitted(37, 2) Source(14, 2) + SourceIndex(0)
 ---
 >>>console.log(s);
 1->
@@ -732,14 +735,14 @@ sourceFile:../../../first/first_PART1.ts
 6 >            s
 7 >             )
 8 >              ;
-1->Emitted(37, 1) Source(14, 2) + SourceIndex(0)
-2 >Emitted(37, 8) Source(14, 9) + SourceIndex(0)
-3 >Emitted(37, 9) Source(14, 10) + SourceIndex(0)
-4 >Emitted(37, 12) Source(14, 13) + SourceIndex(0)
-5 >Emitted(37, 13) Source(14, 14) + SourceIndex(0)
-6 >Emitted(37, 14) Source(14, 15) + SourceIndex(0)
-7 >Emitted(37, 15) Source(14, 16) + SourceIndex(0)
-8 >Emitted(37, 16) Source(14, 17) + SourceIndex(0)
+1->Emitted(38, 1) Source(14, 2) + SourceIndex(0)
+2 >Emitted(38, 8) Source(14, 9) + SourceIndex(0)
+3 >Emitted(38, 9) Source(14, 10) + SourceIndex(0)
+4 >Emitted(38, 12) Source(14, 13) + SourceIndex(0)
+5 >Emitted(38, 13) Source(14, 14) + SourceIndex(0)
+6 >Emitted(38, 14) Source(14, 15) + SourceIndex(0)
+7 >Emitted(38, 15) Source(14, 16) + SourceIndex(0)
+8 >Emitted(38, 16) Source(14, 17) + SourceIndex(0)
 ---
 -------------------------------------------------------------------
 emittedFile:/src/third/thirdjs/output/third-output.js
@@ -764,15 +767,15 @@ sourceFile:../../../first/first_part2.ts
 7 >             ()
 8 >               )
 9 >                ;
-1->Emitted(38, 1) Source(1, 1) + SourceIndex(1)
-2 >Emitted(38, 8) Source(1, 8) + SourceIndex(1)
-3 >Emitted(38, 9) Source(1, 9) + SourceIndex(1)
-4 >Emitted(38, 12) Source(1, 12) + SourceIndex(1)
-5 >Emitted(38, 13) Source(1, 13) + SourceIndex(1)
-6 >Emitted(38, 14) Source(1, 14) + SourceIndex(1)
-7 >Emitted(38, 16) Source(1, 16) + SourceIndex(1)
-8 >Emitted(38, 17) Source(1, 17) + SourceIndex(1)
-9 >Emitted(38, 18) Source(1, 18) + SourceIndex(1)
+1->Emitted(39, 1) Source(1, 1) + SourceIndex(1)
+2 >Emitted(39, 8) Source(1, 8) + SourceIndex(1)
+3 >Emitted(39, 9) Source(1, 9) + SourceIndex(1)
+4 >Emitted(39, 12) Source(1, 12) + SourceIndex(1)
+5 >Emitted(39, 13) Source(1, 13) + SourceIndex(1)
+6 >Emitted(39, 14) Source(1, 14) + SourceIndex(1)
+7 >Emitted(39, 16) Source(1, 16) + SourceIndex(1)
+8 >Emitted(39, 17) Source(1, 17) + SourceIndex(1)
+9 >Emitted(39, 18) Source(1, 18) + SourceIndex(1)
 ---
 -------------------------------------------------------------------
 emittedFile:/src/third/thirdjs/output/third-output.js
@@ -786,9 +789,9 @@ sourceFile:../../../first/first_part3.ts
 1 >
 2 >function 
 3 >         f
-1 >Emitted(39, 1) Source(1, 1) + SourceIndex(2)
-2 >Emitted(39, 10) Source(1, 10) + SourceIndex(2)
-3 >Emitted(39, 11) Source(1, 11) + SourceIndex(2)
+1 >Emitted(40, 1) Source(1, 1) + SourceIndex(2)
+2 >Emitted(40, 10) Source(1, 10) + SourceIndex(2)
+3 >Emitted(40, 11) Source(1, 11) + SourceIndex(2)
 ---
 >>>    return "JS does hoists";
 1->^^^^
@@ -800,10 +803,10 @@ sourceFile:../../../first/first_part3.ts
 2 >    return 
 3 >           "JS does hoists"
 4 >                           ;
-1->Emitted(40, 5) Source(2, 5) + SourceIndex(2)
-2 >Emitted(40, 12) Source(2, 12) + SourceIndex(2)
-3 >Emitted(40, 28) Source(2, 28) + SourceIndex(2)
-4 >Emitted(40, 29) Source(2, 29) + SourceIndex(2)
+1->Emitted(41, 5) Source(2, 5) + SourceIndex(2)
+2 >Emitted(41, 12) Source(2, 12) + SourceIndex(2)
+3 >Emitted(41, 28) Source(2, 28) + SourceIndex(2)
+4 >Emitted(41, 29) Source(2, 29) + SourceIndex(2)
 ---
 >>>}
 1 >
@@ -812,8 +815,8 @@ sourceFile:../../../first/first_part3.ts
 1 >
   >
 2 >}
-1 >Emitted(41, 1) Source(3, 1) + SourceIndex(2)
-2 >Emitted(41, 2) Source(3, 2) + SourceIndex(2)
+1 >Emitted(42, 1) Source(3, 1) + SourceIndex(2)
+2 >Emitted(42, 2) Source(3, 2) + SourceIndex(2)
 ---
 -------------------------------------------------------------------
 emittedFile:/src/third/thirdjs/output/third-output.js
@@ -839,10 +842,10 @@ sourceFile:../../../second/second_part1.ts
   >     
   >         f();
   >     }
-1->Emitted(42, 1) Source(5, 1) + SourceIndex(3)
-2 >Emitted(42, 5) Source(5, 11) + SourceIndex(3)
-3 >Emitted(42, 6) Source(5, 12) + SourceIndex(3)
-4 >Emitted(42, 7) Source(11, 2) + SourceIndex(3)
+1->Emitted(43, 1) Source(5, 1) + SourceIndex(3)
+2 >Emitted(43, 5) Source(5, 11) + SourceIndex(3)
+3 >Emitted(43, 6) Source(5, 12) + SourceIndex(3)
+4 >Emitted(43, 7) Source(11, 2) + SourceIndex(3)
 ---
 >>>(function (N) {
 1->
@@ -852,9 +855,9 @@ sourceFile:../../../second/second_part1.ts
 1->
 2 >namespace 
 3 >           N
-1->Emitted(43, 1) Source(5, 1) + SourceIndex(3)
-2 >Emitted(43, 12) Source(5, 11) + SourceIndex(3)
-3 >Emitted(43, 13) Source(5, 12) + SourceIndex(3)
+1->Emitted(44, 1) Source(5, 1) + SourceIndex(3)
+2 >Emitted(44, 12) Source(5, 11) + SourceIndex(3)
+3 >Emitted(44, 13) Source(5, 12) + SourceIndex(3)
 ---
 >>>    function f() {
 1->^^^^
@@ -865,9 +868,9 @@ sourceFile:../../../second/second_part1.ts
   >    
 2 >    function 
 3 >             f
-1->Emitted(44, 5) Source(6, 5) + SourceIndex(3)
-2 >Emitted(44, 14) Source(6, 14) + SourceIndex(3)
-3 >Emitted(44, 15) Source(6, 15) + SourceIndex(3)
+1->Emitted(45, 5) Source(6, 5) + SourceIndex(3)
+2 >Emitted(45, 14) Source(6, 14) + SourceIndex(3)
+3 >Emitted(45, 15) Source(6, 15) + SourceIndex(3)
 ---
 >>>        console.log('testing');
 1->^^^^^^^^
@@ -887,14 +890,14 @@ sourceFile:../../../second/second_part1.ts
 6 >                    'testing'
 7 >                             )
 8 >                              ;
-1->Emitted(45, 9) Source(7, 9) + SourceIndex(3)
-2 >Emitted(45, 16) Source(7, 16) + SourceIndex(3)
-3 >Emitted(45, 17) Source(7, 17) + SourceIndex(3)
-4 >Emitted(45, 20) Source(7, 20) + SourceIndex(3)
-5 >Emitted(45, 21) Source(7, 21) + SourceIndex(3)
-6 >Emitted(45, 30) Source(7, 30) + SourceIndex(3)
-7 >Emitted(45, 31) Source(7, 31) + SourceIndex(3)
-8 >Emitted(45, 32) Source(7, 32) + SourceIndex(3)
+1->Emitted(46, 9) Source(7, 9) + SourceIndex(3)
+2 >Emitted(46, 16) Source(7, 16) + SourceIndex(3)
+3 >Emitted(46, 17) Source(7, 17) + SourceIndex(3)
+4 >Emitted(46, 20) Source(7, 20) + SourceIndex(3)
+5 >Emitted(46, 21) Source(7, 21) + SourceIndex(3)
+6 >Emitted(46, 30) Source(7, 30) + SourceIndex(3)
+7 >Emitted(46, 31) Source(7, 31) + SourceIndex(3)
+8 >Emitted(46, 32) Source(7, 32) + SourceIndex(3)
 ---
 >>>    }
 1 >^^^^
@@ -903,8 +906,8 @@ sourceFile:../../../second/second_part1.ts
 1 >
   >    
 2 >    }
-1 >Emitted(46, 5) Source(8, 5) + SourceIndex(3)
-2 >Emitted(46, 6) Source(8, 6) + SourceIndex(3)
+1 >Emitted(47, 5) Source(8, 5) + SourceIndex(3)
+2 >Emitted(47, 6) Source(8, 6) + SourceIndex(3)
 ---
 >>>    f();
 1->^^^^
@@ -918,10 +921,10 @@ sourceFile:../../../second/second_part1.ts
 2 >    f
 3 >     ()
 4 >       ;
-1->Emitted(47, 5) Source(10, 5) + SourceIndex(3)
-2 >Emitted(47, 6) Source(10, 6) + SourceIndex(3)
-3 >Emitted(47, 8) Source(10, 8) + SourceIndex(3)
-4 >Emitted(47, 9) Source(10, 9) + SourceIndex(3)
+1->Emitted(48, 5) Source(10, 5) + SourceIndex(3)
+2 >Emitted(48, 6) Source(10, 6) + SourceIndex(3)
+3 >Emitted(48, 8) Source(10, 8) + SourceIndex(3)
+4 >Emitted(48, 9) Source(10, 9) + SourceIndex(3)
 ---
 >>>})(N || (N = {}));
 1->
@@ -946,13 +949,13 @@ sourceFile:../../../second/second_part1.ts
   >          
   >              f();
   >          }
-1->Emitted(48, 1) Source(11, 1) + SourceIndex(3)
-2 >Emitted(48, 2) Source(11, 2) + SourceIndex(3)
-3 >Emitted(48, 4) Source(5, 11) + SourceIndex(3)
-4 >Emitted(48, 5) Source(5, 12) + SourceIndex(3)
-5 >Emitted(48, 10) Source(5, 11) + SourceIndex(3)
-6 >Emitted(48, 11) Source(5, 12) + SourceIndex(3)
-7 >Emitted(48, 19) Source(11, 2) + SourceIndex(3)
+1->Emitted(49, 1) Source(11, 1) + SourceIndex(3)
+2 >Emitted(49, 2) Source(11, 2) + SourceIndex(3)
+3 >Emitted(49, 4) Source(5, 11) + SourceIndex(3)
+4 >Emitted(49, 5) Source(5, 12) + SourceIndex(3)
+5 >Emitted(49, 10) Source(5, 11) + SourceIndex(3)
+6 >Emitted(49, 11) Source(5, 12) + SourceIndex(3)
+7 >Emitted(49, 19) Source(11, 2) + SourceIndex(3)
 ---
 >>>function secondsecond_part1Spread() {
 1->
@@ -963,9 +966,9 @@ sourceFile:../../../second/second_part1.ts
   >
 2 >function 
 3 >         secondsecond_part1Spread
-1->Emitted(49, 1) Source(13, 1) + SourceIndex(3)
-2 >Emitted(49, 10) Source(13, 10) + SourceIndex(3)
-3 >Emitted(49, 34) Source(13, 34) + SourceIndex(3)
+1->Emitted(50, 1) Source(13, 1) + SourceIndex(3)
+2 >Emitted(50, 10) Source(13, 10) + SourceIndex(3)
+3 >Emitted(50, 34) Source(13, 34) + SourceIndex(3)
 ---
 >>>    var b = [];
 1 >^^^^
@@ -973,8 +976,8 @@ sourceFile:../../../second/second_part1.ts
 3 >               ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^->
 1 >(
 2 >    ...b: number[]
-1 >Emitted(50, 5) Source(13, 35) + SourceIndex(3)
-2 >Emitted(50, 16) Source(13, 49) + SourceIndex(3)
+1 >Emitted(51, 5) Source(13, 35) + SourceIndex(3)
+2 >Emitted(51, 16) Source(13, 49) + SourceIndex(3)
 ---
 >>>    for (var _i = 0; _i < arguments.length; _i++) {
 1->^^^^^^^^^
@@ -989,66 +992,88 @@ sourceFile:../../../second/second_part1.ts
 4 >                     ...b: number[]
 5 >                                          
 6 >                                            ...b: number[]
-1->Emitted(51, 10) Source(13, 35) + SourceIndex(3)
-2 >Emitted(51, 20) Source(13, 49) + SourceIndex(3)
-3 >Emitted(51, 22) Source(13, 35) + SourceIndex(3)
-4 >Emitted(51, 43) Source(13, 49) + SourceIndex(3)
-5 >Emitted(51, 45) Source(13, 35) + SourceIndex(3)
-6 >Emitted(51, 49) Source(13, 49) + SourceIndex(3)
+1->Emitted(52, 10) Source(13, 35) + SourceIndex(3)
+2 >Emitted(52, 20) Source(13, 49) + SourceIndex(3)
+3 >Emitted(52, 22) Source(13, 35) + SourceIndex(3)
+4 >Emitted(52, 43) Source(13, 49) + SourceIndex(3)
+5 >Emitted(52, 45) Source(13, 35) + SourceIndex(3)
+6 >Emitted(52, 49) Source(13, 49) + SourceIndex(3)
 ---
 >>>        b[_i] = arguments[_i];
 1 >^^^^^^^^
 2 >        ^^^^^^^^^^^^^^^^^^^^^^
 1 >
 2 >        ...b: number[]
-1 >Emitted(52, 9) Source(13, 35) + SourceIndex(3)
-2 >Emitted(52, 31) Source(13, 49) + SourceIndex(3)
+1 >Emitted(53, 9) Source(13, 35) + SourceIndex(3)
+2 >Emitted(53, 31) Source(13, 49) + SourceIndex(3)
 ---
 >>>    }
 >>>}
 1 >
 2 >^
-3 > ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^->
+3 > ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^->
 1 >) { 
 2 >}
-1 >Emitted(54, 1) Source(13, 53) + SourceIndex(3)
-2 >Emitted(54, 2) Source(13, 54) + SourceIndex(3)
+1 >Emitted(55, 1) Source(13, 53) + SourceIndex(3)
+2 >Emitted(55, 2) Source(13, 54) + SourceIndex(3)
 ---
->>>secondsecond_part1Spread.apply(void 0, __spread([10, 20, 30]));
+>>>var secondsecond_part1_ar = [20, 30];
+1->
+2 >^^^^
+3 >    ^^^^^^^^^^^^^^^^^^^^^
+4 >                         ^^^
+5 >                            ^
+6 >                             ^^
+7 >                               ^^
+8 >                                 ^^
+9 >                                   ^
+10>                                    ^
+11>                                     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^->
+1->
+  >
+2 >const 
+3 >    secondsecond_part1_ar
+4 >                          = 
+5 >                            [
+6 >                             20
+7 >                               , 
+8 >                                 30
+9 >                                   ]
+10>                                    ;
+1->Emitted(56, 1) Source(14, 1) + SourceIndex(3)
+2 >Emitted(56, 5) Source(14, 7) + SourceIndex(3)
+3 >Emitted(56, 26) Source(14, 28) + SourceIndex(3)
+4 >Emitted(56, 29) Source(14, 31) + SourceIndex(3)
+5 >Emitted(56, 30) Source(14, 32) + SourceIndex(3)
+6 >Emitted(56, 32) Source(14, 34) + SourceIndex(3)
+7 >Emitted(56, 34) Source(14, 36) + SourceIndex(3)
+8 >Emitted(56, 36) Source(14, 38) + SourceIndex(3)
+9 >Emitted(56, 37) Source(14, 39) + SourceIndex(3)
+10>Emitted(56, 38) Source(14, 40) + SourceIndex(3)
+---
+>>>secondsecond_part1Spread.apply(void 0, __spreadArray([10], __read(secondsecond_part1_ar)));
 1->
 2 >^^^^^^^^^^^^^^^^^^^^^^^^
-3 >                        ^^^^^^^^^^^^^^^^^^^^^^^^
-4 >                                                ^
-5 >                                                 ^^
-6 >                                                   ^^
-7 >                                                     ^^
-8 >                                                       ^^
-9 >                                                         ^^
-10>                                                           ^
-11>                                                            ^^^
+3 >                        ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+4 >                                                      ^^
+5 >                                                        ^^^^^^^^^^
+6 >                                                                  ^^^^^^^^^^^^^^^^^^^^^
+7 >                                                                                       ^^^^
 1->
   >
 2 >secondsecond_part1Spread
-3 >                        (...
-4 >                                                [
-5 >                                                 10
-6 >                                                   , 
-7 >                                                     20
-8 >                                                       , 
-9 >                                                         30
-10>                                                           ]
-11>                                                            );
-1->Emitted(55, 1) Source(14, 1) + SourceIndex(3)
-2 >Emitted(55, 25) Source(14, 25) + SourceIndex(3)
-3 >Emitted(55, 49) Source(14, 29) + SourceIndex(3)
-4 >Emitted(55, 50) Source(14, 30) + SourceIndex(3)
-5 >Emitted(55, 52) Source(14, 32) + SourceIndex(3)
-6 >Emitted(55, 54) Source(14, 34) + SourceIndex(3)
-7 >Emitted(55, 56) Source(14, 36) + SourceIndex(3)
-8 >Emitted(55, 58) Source(14, 38) + SourceIndex(3)
-9 >Emitted(55, 60) Source(14, 40) + SourceIndex(3)
-10>Emitted(55, 61) Source(14, 41) + SourceIndex(3)
-11>Emitted(55, 64) Source(14, 43) + SourceIndex(3)
+3 >                        (
+4 >                                                      10
+5 >                                                        , ...
+6 >                                                                  secondsecond_part1_ar
+7 >                                                                                       );
+1->Emitted(57, 1) Source(15, 1) + SourceIndex(3)
+2 >Emitted(57, 25) Source(15, 25) + SourceIndex(3)
+3 >Emitted(57, 55) Source(15, 26) + SourceIndex(3)
+4 >Emitted(57, 57) Source(15, 28) + SourceIndex(3)
+5 >Emitted(57, 67) Source(15, 33) + SourceIndex(3)
+6 >Emitted(57, 88) Source(15, 54) + SourceIndex(3)
+7 >Emitted(57, 92) Source(15, 56) + SourceIndex(3)
 ---
 -------------------------------------------------------------------
 emittedFile:/src/third/thirdjs/output/third-output.js
@@ -1058,13 +1083,13 @@ sourceFile:../../../second/second_part2.ts
 1 >
 2 >^^^^^^^^^^^^^^^^^^^->
 1 >
-1 >Emitted(56, 1) Source(1, 1) + SourceIndex(4)
+1 >Emitted(58, 1) Source(1, 1) + SourceIndex(4)
 ---
 >>>    function C() {
 1->^^^^
 2 >    ^^->
 1->
-1->Emitted(57, 5) Source(1, 1) + SourceIndex(4)
+1->Emitted(59, 5) Source(1, 1) + SourceIndex(4)
 ---
 >>>    }
 1->^^^^
@@ -1076,8 +1101,8 @@ sourceFile:../../../second/second_part2.ts
   >    }
   >
 2 >    }
-1->Emitted(58, 5) Source(5, 1) + SourceIndex(4)
-2 >Emitted(58, 6) Source(5, 2) + SourceIndex(4)
+1->Emitted(60, 5) Source(5, 1) + SourceIndex(4)
+2 >Emitted(60, 6) Source(5, 2) + SourceIndex(4)
 ---
 >>>    C.prototype.doSomething = function () {
 1->^^^^
@@ -1087,9 +1112,9 @@ sourceFile:../../../second/second_part2.ts
 1->
 2 >    doSomething
 3 >                           
-1->Emitted(59, 5) Source(2, 5) + SourceIndex(4)
-2 >Emitted(59, 28) Source(2, 16) + SourceIndex(4)
-3 >Emitted(59, 31) Source(2, 5) + SourceIndex(4)
+1->Emitted(61, 5) Source(2, 5) + SourceIndex(4)
+2 >Emitted(61, 28) Source(2, 16) + SourceIndex(4)
+3 >Emitted(61, 31) Source(2, 5) + SourceIndex(4)
 ---
 >>>        console.log("something got done");
 1->^^^^^^^^
@@ -1109,14 +1134,14 @@ sourceFile:../../../second/second_part2.ts
 6 >                    "something got done"
 7 >                                        )
 8 >                                         ;
-1->Emitted(60, 9) Source(3, 9) + SourceIndex(4)
-2 >Emitted(60, 16) Source(3, 16) + SourceIndex(4)
-3 >Emitted(60, 17) Source(3, 17) + SourceIndex(4)
-4 >Emitted(60, 20) Source(3, 20) + SourceIndex(4)
-5 >Emitted(60, 21) Source(3, 21) + SourceIndex(4)
-6 >Emitted(60, 41) Source(3, 41) + SourceIndex(4)
-7 >Emitted(60, 42) Source(3, 42) + SourceIndex(4)
-8 >Emitted(60, 43) Source(3, 43) + SourceIndex(4)
+1->Emitted(62, 9) Source(3, 9) + SourceIndex(4)
+2 >Emitted(62, 16) Source(3, 16) + SourceIndex(4)
+3 >Emitted(62, 17) Source(3, 17) + SourceIndex(4)
+4 >Emitted(62, 20) Source(3, 20) + SourceIndex(4)
+5 >Emitted(62, 21) Source(3, 21) + SourceIndex(4)
+6 >Emitted(62, 41) Source(3, 41) + SourceIndex(4)
+7 >Emitted(62, 42) Source(3, 42) + SourceIndex(4)
+8 >Emitted(62, 43) Source(3, 43) + SourceIndex(4)
 ---
 >>>    };
 1 >^^^^
@@ -1125,8 +1150,8 @@ sourceFile:../../../second/second_part2.ts
 1 >
   >    
 2 >    }
-1 >Emitted(61, 5) Source(4, 5) + SourceIndex(4)
-2 >Emitted(61, 6) Source(4, 6) + SourceIndex(4)
+1 >Emitted(63, 5) Source(4, 5) + SourceIndex(4)
+2 >Emitted(63, 6) Source(4, 6) + SourceIndex(4)
 ---
 >>>    return C;
 1->^^^^
@@ -1134,8 +1159,8 @@ sourceFile:../../../second/second_part2.ts
 1->
   >
 2 >    }
-1->Emitted(62, 5) Source(5, 1) + SourceIndex(4)
-2 >Emitted(62, 13) Source(5, 2) + SourceIndex(4)
+1->Emitted(64, 5) Source(5, 1) + SourceIndex(4)
+2 >Emitted(64, 13) Source(5, 2) + SourceIndex(4)
 ---
 >>>}());
 1 >
@@ -1151,10 +1176,10 @@ sourceFile:../../../second/second_part2.ts
   >         console.log("something got done");
   >     }
   > }
-1 >Emitted(63, 1) Source(5, 1) + SourceIndex(4)
-2 >Emitted(63, 2) Source(5, 2) + SourceIndex(4)
-3 >Emitted(63, 2) Source(1, 1) + SourceIndex(4)
-4 >Emitted(63, 6) Source(5, 2) + SourceIndex(4)
+1 >Emitted(65, 1) Source(5, 1) + SourceIndex(4)
+2 >Emitted(65, 2) Source(5, 2) + SourceIndex(4)
+3 >Emitted(65, 2) Source(1, 1) + SourceIndex(4)
+4 >Emitted(65, 6) Source(5, 2) + SourceIndex(4)
 ---
 -------------------------------------------------------------------
 emittedFile:/src/third/thirdjs/output/third-output.js
@@ -1178,14 +1203,14 @@ sourceFile:../../third_part1.ts
 6 >            C
 7 >             ()
 8 >               ;
-1->Emitted(64, 1) Source(1, 1) + SourceIndex(5)
-2 >Emitted(64, 5) Source(1, 5) + SourceIndex(5)
-3 >Emitted(64, 6) Source(1, 6) + SourceIndex(5)
-4 >Emitted(64, 9) Source(1, 9) + SourceIndex(5)
-5 >Emitted(64, 13) Source(1, 13) + SourceIndex(5)
-6 >Emitted(64, 14) Source(1, 14) + SourceIndex(5)
-7 >Emitted(64, 16) Source(1, 16) + SourceIndex(5)
-8 >Emitted(64, 17) Source(1, 17) + SourceIndex(5)
+1->Emitted(66, 1) Source(1, 1) + SourceIndex(5)
+2 >Emitted(66, 5) Source(1, 5) + SourceIndex(5)
+3 >Emitted(66, 6) Source(1, 6) + SourceIndex(5)
+4 >Emitted(66, 9) Source(1, 9) + SourceIndex(5)
+5 >Emitted(66, 13) Source(1, 13) + SourceIndex(5)
+6 >Emitted(66, 14) Source(1, 14) + SourceIndex(5)
+7 >Emitted(66, 16) Source(1, 16) + SourceIndex(5)
+8 >Emitted(66, 17) Source(1, 17) + SourceIndex(5)
 ---
 >>>c.doSomething();
 1->
@@ -1202,12 +1227,12 @@ sourceFile:../../third_part1.ts
 4 >  doSomething
 5 >             ()
 6 >               ;
-1->Emitted(65, 1) Source(2, 1) + SourceIndex(5)
-2 >Emitted(65, 2) Source(2, 2) + SourceIndex(5)
-3 >Emitted(65, 3) Source(2, 3) + SourceIndex(5)
-4 >Emitted(65, 14) Source(2, 14) + SourceIndex(5)
-5 >Emitted(65, 16) Source(2, 16) + SourceIndex(5)
-6 >Emitted(65, 17) Source(2, 17) + SourceIndex(5)
+1->Emitted(67, 1) Source(2, 1) + SourceIndex(5)
+2 >Emitted(67, 2) Source(2, 2) + SourceIndex(5)
+3 >Emitted(67, 3) Source(2, 3) + SourceIndex(5)
+4 >Emitted(67, 14) Source(2, 14) + SourceIndex(5)
+5 >Emitted(67, 16) Source(2, 16) + SourceIndex(5)
+6 >Emitted(67, 17) Source(2, 17) + SourceIndex(5)
 ---
 >>>function forthirdthird_part1Rest() {
 1->
@@ -1218,9 +1243,9 @@ sourceFile:../../third_part1.ts
   >
 2 >function 
 3 >         forthirdthird_part1Rest
-1->Emitted(66, 1) Source(3, 1) + SourceIndex(5)
-2 >Emitted(66, 10) Source(3, 10) + SourceIndex(5)
-3 >Emitted(66, 33) Source(3, 33) + SourceIndex(5)
+1->Emitted(68, 1) Source(3, 1) + SourceIndex(5)
+2 >Emitted(68, 10) Source(3, 10) + SourceIndex(5)
+3 >Emitted(68, 33) Source(3, 33) + SourceIndex(5)
 ---
 >>>    var _a = { a: 10, b: 30, yy: 30 }, b = _a.b, rest = __rest(_a, ["b"]);
 1->^^^^
@@ -1274,31 +1299,31 @@ sourceFile:../../third_part1.ts
 23>                                                                   { b, ...rest }
 24>                                                                         = { a: 10, b: 30, yy: 30 }
 25>                                                                         ;
-1->Emitted(67, 5) Source(4, 1) + SourceIndex(5)
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-6 >Emitted(67, 19) Source(4, 29) + SourceIndex(5)
-7 >Emitted(67, 21) Source(4, 31) + SourceIndex(5)
-8 >Emitted(67, 23) Source(4, 33) + SourceIndex(5)
-9 >Emitted(67, 24) Source(4, 34) + SourceIndex(5)
-10>Emitted(67, 26) Source(4, 36) + SourceIndex(5)
-11>Emitted(67, 28) Source(4, 38) + SourceIndex(5)
-12>Emitted(67, 30) Source(4, 40) + SourceIndex(5)
-13>Emitted(67, 32) Source(4, 42) + SourceIndex(5)
-14>Emitted(67, 34) Source(4, 44) + SourceIndex(5)
-15>Emitted(67, 36) Source(4, 46) + SourceIndex(5)
-16>Emitted(67, 38) Source(4, 48) + SourceIndex(5)
-17>Emitted(67, 40) Source(4, 9) + SourceIndex(5)
-18>Emitted(67, 41) Source(4, 10) + SourceIndex(5)
-19>Emitted(67, 48) Source(4, 10) + SourceIndex(5)
-20>Emitted(67, 50) Source(4, 15) + SourceIndex(5)
-21>Emitted(67, 54) Source(4, 19) + SourceIndex(5)
-22>Emitted(67, 68) Source(4, 7) + SourceIndex(5)
-23>Emitted(67, 73) Source(4, 21) + SourceIndex(5)
-24>Emitted(67, 74) Source(4, 48) + SourceIndex(5)
-25>Emitted(67, 75) Source(4, 49) + SourceIndex(5)
+1->Emitted(69, 5) Source(4, 1) + SourceIndex(5)
+2 >Emitted(69, 9) Source(4, 7) + SourceIndex(5)
+3 >Emitted(69, 14) Source(4, 24) + SourceIndex(5)
+4 >Emitted(69, 16) Source(4, 26) + SourceIndex(5)
+5 >Emitted(69, 17) Source(4, 27) + SourceIndex(5)
+6 >Emitted(69, 19) Source(4, 29) + SourceIndex(5)
+7 >Emitted(69, 21) Source(4, 31) + SourceIndex(5)
+8 >Emitted(69, 23) Source(4, 33) + SourceIndex(5)
+9 >Emitted(69, 24) Source(4, 34) + SourceIndex(5)
+10>Emitted(69, 26) Source(4, 36) + SourceIndex(5)
+11>Emitted(69, 28) Source(4, 38) + SourceIndex(5)
+12>Emitted(69, 30) Source(4, 40) + SourceIndex(5)
+13>Emitted(69, 32) Source(4, 42) + SourceIndex(5)
+14>Emitted(69, 34) Source(4, 44) + SourceIndex(5)
+15>Emitted(69, 36) Source(4, 46) + SourceIndex(5)
+16>Emitted(69, 38) Source(4, 48) + SourceIndex(5)
+17>Emitted(69, 40) Source(4, 9) + SourceIndex(5)
+18>Emitted(69, 41) Source(4, 10) + SourceIndex(5)
+19>Emitted(69, 48) Source(4, 10) + SourceIndex(5)
+20>Emitted(69, 50) Source(4, 15) + SourceIndex(5)
+21>Emitted(69, 54) Source(4, 19) + SourceIndex(5)
+22>Emitted(69, 68) Source(4, 7) + SourceIndex(5)
+23>Emitted(69, 73) Source(4, 21) + SourceIndex(5)
+24>Emitted(69, 74) Source(4, 48) + SourceIndex(5)
+25>Emitted(69, 75) Source(4, 49) + SourceIndex(5)
 ---
 >>>}
 1 >
@@ -1307,8 +1332,8 @@ sourceFile:../../third_part1.ts
 1 >
   >
 2 >}
-1 >Emitted(68, 1) Source(5, 1) + SourceIndex(5)
-2 >Emitted(68, 2) Source(5, 2) + SourceIndex(5)
+1 >Emitted(70, 1) Source(5, 1) + SourceIndex(5)
+2 >Emitted(70, 2) Source(5, 2) + SourceIndex(5)
 ---
 >>>//# sourceMappingURL=third-output.js.map
 
@@ -1335,39 +1360,39 @@ sourceFile:../../third_part1.ts
         },
         {
           "pos": 1008,
-          "end": 1178,
+          "end": 1199,
           "kind": "emitHelpers",
-          "data": "typescript:spread"
+          "data": "typescript:spreadArray"
         },
         {
-          "pos": 1180,
-          "end": 1424,
+          "pos": 1201,
+          "end": 1445,
           "kind": "prepend",
           "data": "../../../first/bin/first-output.js",
           "texts": [
             {
-              "pos": 1180,
-              "end": 1424,
+              "pos": 1201,
+              "end": 1445,
               "kind": "text"
             }
           ]
         },
         {
-          "pos": 1424,
-          "end": 1925,
+          "pos": 1445,
+          "end": 2013,
           "kind": "prepend",
           "data": "../../../2/second-output.js",
           "texts": [
             {
-              "pos": 1424,
-              "end": 1925,
+              "pos": 1445,
+              "end": 2013,
               "kind": "text"
             }
           ]
         },
         {
-          "pos": 1925,
-          "end": 2078,
+          "pos": 2013,
+          "end": 2166,
           "kind": "text"
         }
       ],
@@ -1394,20 +1419,20 @@ sourceFile:../../third_part1.ts
         },
         {
           "pos": 208,
-          "end": 374,
+          "end": 422,
           "kind": "prepend",
           "data": "../../../2/second-output.d.ts",
           "texts": [
             {
               "pos": 208,
-              "end": 374,
+              "end": 422,
               "kind": "text"
             }
           ]
         },
         {
-          "pos": 374,
-          "end": 444,
+          "pos": 422,
+          "end": 492,
           "kind": "text"
         }
       ]
@@ -1451,15 +1476,16 @@ var __read = (this && this.__read) || function (o, n) {
     return ar;
 };
 ----------------------------------------------------------------------
-emitHelpers: (1008-1178):: typescript:spread
-var __spread = (this && this.__spread) || function () {
-    for (var ar = [], i = 0; i < arguments.length; i++) ar = ar.concat(__read(arguments[i]));
-    return ar;
+emitHelpers: (1008-1199):: typescript:spreadArray
+var __spreadArray = (this && this.__spreadArray) || function (to, from) {
+    for (var i = 0, il = from.length, j = to.length; i < il; i++, j++)
+        to[j] = from[i];
+    return to;
 };
 ----------------------------------------------------------------------
-prepend: (1180-1424):: ../../../first/bin/first-output.js texts:: 1
+prepend: (1201-1445):: ../../../first/bin/first-output.js texts:: 1
 >>--------------------------------------------------------------------
-text: (1180-1424)
+text: (1201-1445)
 var s = "Hello, world";
 console.log(s);
 function forfirstfirst_PART1Rest() {
@@ -1472,9 +1498,9 @@ function f() {
 }
 
 ----------------------------------------------------------------------
-prepend: (1424-1925):: ../../../2/second-output.js texts:: 1
+prepend: (1445-2013):: ../../../2/second-output.js texts:: 1
 >>--------------------------------------------------------------------
-text: (1424-1925)
+text: (1445-2013)
 var N;
 (function (N) {
     function f() {
@@ -1488,7 +1514,8 @@ function secondsecond_part1Spread() {
         b[_i] = arguments[_i];
     }
 }
-secondsecond_part1Spread.apply(void 0, __spread([10, 20, 30]));
+var secondsecond_part1_ar = [20, 30];
+secondsecond_part1Spread.apply(void 0, __spreadArray([10], __read(secondsecond_part1_ar)));
 var C = (function () {
     function C() {
     }
@@ -1499,7 +1526,7 @@ var C = (function () {
 }());
 
 ----------------------------------------------------------------------
-text: (1925-2078)
+text: (2013-2166)
 var c = new C();
 c.doSomething();
 function forthirdthird_part1Rest() {
@@ -1524,20 +1551,21 @@ declare function forfirstfirst_PART1Rest(): void;
 declare function f(): string;
 
 ----------------------------------------------------------------------
-prepend: (208-374):: ../../../2/second-output.d.ts texts:: 1
+prepend: (208-422):: ../../../2/second-output.d.ts texts:: 1
 >>--------------------------------------------------------------------
-text: (208-374)
+text: (208-422)
 declare namespace N {
 }
 declare namespace N {
 }
 declare function secondsecond_part1Spread(...b: number[]): void;
+declare const secondsecond_part1_ar: number[];
 declare class C {
     doSomething(): void;
 }
 
 ----------------------------------------------------------------------
-text: (374-444)
+text: (422-492)
 declare var c: C;
 declare function forthirdthird_part1Rest(): void;
 

tests/baselines/reference/tsbuild/outfile-concat/incremental-headers-change-without-dts-changes/multiple-emitHelpers-in-different-projects.js

@@ -425,7 +425,7 @@ declare function f(): string;
 ======================================================================
 
 //// [/src/third/thirdjs/output/third-output.d.ts.map]
-{"version":3,"file":"third-output.d.ts","sourceRoot":"","sources":["../../../first/first_PART1.ts","../../../first/first_part3.ts","../../../second/second_part1.ts","../../../second/second_part2.ts","../../third_part1.ts"],"names":[],"mappings":"AAAA,UAAU,QAAQ;IACd,IAAI,EAAE,GAAG,CAAC;CACb;AAED,QAAA,MAAM,CAAC,iBAAiB,CAAC;AAEzB,UAAU,iBAAiB;IACvB,IAAI,EAAE,GAAG,CAAC;CACb;AAGD,iBAAS,uBAAuB,SAAM;ACXtC,iBAAS,CAAC,WAET;ACFD,kBAAU,CAAC,CAAC;CAEX;AAED,kBAAU,CAAC,CAAC;CAMX;AAED,iBAAS,wBAAwB,CAAC,GAAG,GAAG,MAAM,EAAE,QAAK;ACZrD,cAAM,CAAC;IACH,WAAW;CAGd;ACJD,QAAA,IAAI,CAAC,GAAU,CAAC;AAEhB,iBAAS,uBAAuB,SAE/B"}
+{"version":3,"file":"third-output.d.ts","sourceRoot":"","sources":["../../../first/first_PART1.ts","../../../first/first_part3.ts","../../../second/second_part1.ts","../../../second/second_part2.ts","../../third_part1.ts"],"names":[],"mappings":"AAAA,UAAU,QAAQ;IACd,IAAI,EAAE,GAAG,CAAC;CACb;AAED,QAAA,MAAM,CAAC,iBAAiB,CAAC;AAEzB,UAAU,iBAAiB;IACvB,IAAI,EAAE,GAAG,CAAC;CACb;AAGD,iBAAS,uBAAuB,SAAM;ACXtC,iBAAS,CAAC,WAET;ACFD,kBAAU,CAAC,CAAC;CAEX;AAED,kBAAU,CAAC,CAAC;CAMX;AAED,iBAAS,wBAAwB,CAAC,GAAG,GAAG,MAAM,EAAE,QAAK;AACrD,QAAA,MAAM,qBAAqB,UAAW,CAAC;ACbvC,cAAM,CAAC;IACH,WAAW;CAGd;ACJD,QAAA,IAAI,CAAC,GAAU,CAAC;AAEhB,iBAAS,uBAAuB,SAE/B"}
 
 //// [/src/third/thirdjs/output/third-output.d.ts.map.baseline.txt]
 ===================================================================
@@ -656,6 +656,27 @@ sourceFile:../../../second/second_part1.ts
 8 >Emitted(14, 57) Source(13, 49) + SourceIndex(2)
 9 >Emitted(14, 65) Source(13, 54) + SourceIndex(2)
 ---
+>>>declare const secondsecond_part1_ar: number[];
+1 >
+2 >^^^^^^^^
+3 >        ^^^^^^
+4 >              ^^^^^^^^^^^^^^^^^^^^^
+5 >                                   ^^^^^^^^^^
+6 >                                             ^
+1 >
+  >
+2 >
+3 >        const 
+4 >              secondsecond_part1_ar
+5 >                                    = [20, 30]
+6 >                                             ;
+1 >Emitted(15, 1) Source(14, 1) + SourceIndex(2)
+2 >Emitted(15, 9) Source(14, 1) + SourceIndex(2)
+3 >Emitted(15, 15) Source(14, 7) + SourceIndex(2)
+4 >Emitted(15, 36) Source(14, 28) + SourceIndex(2)
+5 >Emitted(15, 46) Source(14, 39) + SourceIndex(2)
+6 >Emitted(15, 47) Source(14, 40) + SourceIndex(2)
+---
 -------------------------------------------------------------------
 emittedFile:/src/third/thirdjs/output/third-output.d.ts
 sourceFile:../../../second/second_part2.ts
@@ -668,9 +689,9 @@ sourceFile:../../../second/second_part2.ts
 1 >
 2 >class 
 3 >              C
-1 >Emitted(15, 1) Source(1, 1) + SourceIndex(3)
-2 >Emitted(15, 15) Source(1, 7) + SourceIndex(3)
-3 >Emitted(15, 16) Source(1, 8) + SourceIndex(3)
+1 >Emitted(16, 1) Source(1, 1) + SourceIndex(3)
+2 >Emitted(16, 15) Source(1, 7) + SourceIndex(3)
+3 >Emitted(16, 16) Source(1, 8) + SourceIndex(3)
 ---
 >>>    doSomething(): void;
 1->^^^^
@@ -678,8 +699,8 @@ sourceFile:../../../second/second_part2.ts
 1-> {
   >    
 2 >    doSomething
-1->Emitted(16, 5) Source(2, 5) + SourceIndex(3)
-2 >Emitted(16, 16) Source(2, 16) + SourceIndex(3)
+1->Emitted(17, 5) Source(2, 5) + SourceIndex(3)
+2 >Emitted(17, 16) Source(2, 16) + SourceIndex(3)
 ---
 >>>}
 1 >^
@@ -688,7 +709,7 @@ sourceFile:../../../second/second_part2.ts
   >        console.log("something got done");
   >    }
   >}
-1 >Emitted(17, 2) Source(5, 2) + SourceIndex(3)
+1 >Emitted(18, 2) Source(5, 2) + SourceIndex(3)
 ---
 -------------------------------------------------------------------
 emittedFile:/src/third/thirdjs/output/third-output.d.ts
@@ -708,12 +729,12 @@ sourceFile:../../third_part1.ts
 4 >            c
 5 >              = new C()
 6 >                ;
-1->Emitted(18, 1) Source(1, 1) + SourceIndex(4)
-2 >Emitted(18, 9) Source(1, 1) + SourceIndex(4)
-3 >Emitted(18, 13) Source(1, 5) + SourceIndex(4)
-4 >Emitted(18, 14) Source(1, 6) + SourceIndex(4)
-5 >Emitted(18, 17) Source(1, 16) + SourceIndex(4)
-6 >Emitted(18, 18) Source(1, 17) + SourceIndex(4)
+1->Emitted(19, 1) Source(1, 1) + SourceIndex(4)
+2 >Emitted(19, 9) Source(1, 1) + SourceIndex(4)
+3 >Emitted(19, 13) Source(1, 5) + SourceIndex(4)
+4 >Emitted(19, 14) Source(1, 6) + SourceIndex(4)
+5 >Emitted(19, 17) Source(1, 16) + SourceIndex(4)
+6 >Emitted(19, 18) Source(1, 17) + SourceIndex(4)
 ---
 >>>declare function forthirdthird_part1Rest(): void;
 1->
@@ -728,10 +749,10 @@ sourceFile:../../third_part1.ts
 4 >                                        () {
   >                                        const { b, ...rest } = { a: 10, b: 30, yy: 30 };
   >                                        }
-1->Emitted(19, 1) Source(3, 1) + SourceIndex(4)
-2 >Emitted(19, 18) Source(3, 10) + SourceIndex(4)
-3 >Emitted(19, 41) Source(3, 33) + SourceIndex(4)
-4 >Emitted(19, 50) Source(5, 2) + SourceIndex(4)
+1->Emitted(20, 1) Source(3, 1) + SourceIndex(4)
+2 >Emitted(20, 18) Source(3, 10) + SourceIndex(4)
+3 >Emitted(20, 41) Source(3, 33) + SourceIndex(4)
+4 >Emitted(20, 50) Source(5, 2) + SourceIndex(4)
 ---
 >>>//# sourceMappingURL=third-output.d.ts.map
 
@@ -752,9 +773,10 @@ var __read = (this && this.__read) || function (o, n) {
     }
     return ar;
 };
-var __spread = (this && this.__spread) || function () {
-    for (var ar = [], i = 0; i < arguments.length; i++) ar = ar.concat(__read(arguments[i]));
-    return ar;
+var __spreadArray = (this && this.__spreadArray) || function (to, from) {
+    for (var i = 0, il = from.length, j = to.length; i < il; i++, j++)
+        to[j] = from[i];
+    return to;
 };
 var __rest = (this && this.__rest) || function (s, e) {
     var t = {};
@@ -787,7 +809,8 @@ function secondsecond_part1Spread() {
         b[_i] = arguments[_i];
     }
 }
-secondsecond_part1Spread.apply(void 0, __spread([10, 20, 30]));
+var secondsecond_part1_ar = [20, 30];
+secondsecond_part1Spread.apply(void 0, __spreadArray([10], __read(secondsecond_part1_ar)));
 var C = (function () {
     function C() {
     }
@@ -804,7 +827,7 @@ function forthirdthird_part1Rest() {
 //# sourceMappingURL=third-output.js.map
 
 //// [/src/third/thirdjs/output/third-output.js.map]
-{"version":3,"file":"third-output.js","sourceRoot":"","sources":["../../../first/first_PART1.ts","../../../first/first_part2.ts","../../../first/first_part3.ts","../../../second/second_part1.ts","../../../second/second_part2.ts","../../third_part1.ts"],"names":[],"mappings":";;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;AAIA,IAAM,CAAC,GAAG,cAAc,CAAC;AAMzB,OAAO,CAAC,GAAG,CAAC,CAAC,CAAC,CAAC;AACf,SAAS,uBAAuB,KAAK,CAAC;ACXtC,OAAO,CAAC,GAAG,CAAC,CAAC,EAAE,CAAC,CAAC;ACAjB,SAAS,CAAC;IACN,OAAO,gBAAgB,CAAC;AAC5B,CAAC;ACED,IAAU,CAAC,CAMV;AAND,WAAU,CAAC;IACP,SAAS,CAAC;QACN,OAAO,CAAC,GAAG,CAAC,SAAS,CAAC,CAAC;IAC3B,CAAC;IAED,CAAC,EAAE,CAAC;AACR,CAAC,EANS,CAAC,KAAD,CAAC,QAMV;AAED,SAAS,wBAAwB;IAAC,WAAc;SAAd,UAAc,EAAd,qBAAc,EAAd,IAAc;QAAd,sBAAc;;AAAI,CAAC;AACrD,wBAAwB,wBAAI,CAAC,EAAE,EAAE,EAAE,EAAE,EAAE,CAAC,GAAE;ACb1C;IAAA;IAIA,CAAC;IAHG,uBAAW,GAAX;QACI,OAAO,CAAC,GAAG,CAAC,oBAAoB,CAAC,CAAC;IACtC,CAAC;IACL,QAAC;AAAD,CAAC,AAJD,IAIC;ACJD,IAAI,CAAC,GAAG,IAAI,CAAC,EAAE,CAAC;AAChB,CAAC,CAAC,WAAW,EAAE,CAAC;AAChB,SAAS,uBAAuB;IAChC,IAAM,KAAiB,EAAE,CAAC,EAAE,EAAE,EAAE,CAAC,EAAE,EAAE,EAAE,EAAE,EAAE,EAAE,EAAE,EAAvC,CAAC,OAAA,EAAK,IAAI,cAAZ,KAAc,CAA2B,CAAC;AAChD,CAAC"}
+{"version":3,"file":"third-output.js","sourceRoot":"","sources":["../../../first/first_PART1.ts","../../../first/first_part2.ts","../../../first/first_part3.ts","../../../second/second_part1.ts","../../../second/second_part2.ts","../../third_part1.ts"],"names":[],"mappings":";;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;AAIA,IAAM,CAAC,GAAG,cAAc,CAAC;AAMzB,OAAO,CAAC,GAAG,CAAC,CAAC,CAAC,CAAC;AACf,SAAS,uBAAuB,KAAK,CAAC;ACXtC,OAAO,CAAC,GAAG,CAAC,CAAC,EAAE,CAAC,CAAC;ACAjB,SAAS,CAAC;IACN,OAAO,gBAAgB,CAAC;AAC5B,CAAC;ACED,IAAU,CAAC,CAMV;AAND,WAAU,CAAC;IACP,SAAS,CAAC;QACN,OAAO,CAAC,GAAG,CAAC,SAAS,CAAC,CAAC;IAC3B,CAAC;IAED,CAAC,EAAE,CAAC;AACR,CAAC,EANS,CAAC,KAAD,CAAC,QAMV;AAED,SAAS,wBAAwB;IAAC,WAAc;SAAd,UAAc,EAAd,qBAAc,EAAd,IAAc;QAAd,sBAAc;;AAAI,CAAC;AACrD,IAAM,qBAAqB,GAAG,CAAC,EAAE,EAAE,EAAE,CAAC,CAAC;AACvC,wBAAwB,8BAAC,EAAE,UAAK,qBAAqB,IAAE;ACdvD;IAAA;IAIA,CAAC;IAHG,uBAAW,GAAX;QACI,OAAO,CAAC,GAAG,CAAC,oBAAoB,CAAC,CAAC;IACtC,CAAC;IACL,QAAC;AAAD,CAAC,AAJD,IAIC;ACJD,IAAI,CAAC,GAAG,IAAI,CAAC,EAAE,CAAC;AAChB,CAAC,CAAC,WAAW,EAAE,CAAC;AAChB,SAAS,uBAAuB;IAChC,IAAM,KAAiB,EAAE,CAAC,EAAE,EAAE,EAAE,CAAC,EAAE,EAAE,EAAE,EAAE,EAAE,EAAE,EAAE,EAAvC,CAAC,OAAA,EAAK,IAAI,cAAZ,KAAc,CAA2B,CAAC;AAChD,CAAC"}
 
 //// [/src/third/thirdjs/output/third-output.js.map.baseline.txt]
 ===================================================================
@@ -833,9 +856,10 @@ sourceFile:../../../first/first_PART1.ts
 >>>    }
 >>>    return ar;
 >>>};
->>>var __spread = (this && this.__spread) || function () {
->>>    for (var ar = [], i = 0; i < arguments.length; i++) ar = ar.concat(__read(arguments[i]));
->>>    return ar;
+>>>var __spreadArray = (this && this.__spreadArray) || function (to, from) {
+>>>    for (var i = 0, il = from.length, j = to.length; i < il; i++, j++)
+>>>        to[j] = from[i];
+>>>    return to;
 >>>};
 >>>var __rest = (this && this.__rest) || function (s, e) {
 >>>    var t = {};
@@ -865,12 +889,12 @@ sourceFile:../../../first/first_PART1.ts
 4 >      = 
 5 >        "Hello, world"
 6 >                      ;
-1 >Emitted(32, 1) Source(5, 1) + SourceIndex(0)
-2 >Emitted(32, 5) Source(5, 7) + SourceIndex(0)
-3 >Emitted(32, 6) Source(5, 8) + SourceIndex(0)
-4 >Emitted(32, 9) Source(5, 11) + SourceIndex(0)
-5 >Emitted(32, 23) Source(5, 25) + SourceIndex(0)
-6 >Emitted(32, 24) Source(5, 26) + SourceIndex(0)
+1 >Emitted(33, 1) Source(5, 1) + SourceIndex(0)
+2 >Emitted(33, 5) Source(5, 7) + SourceIndex(0)
+3 >Emitted(33, 6) Source(5, 8) + SourceIndex(0)
+4 >Emitted(33, 9) Source(5, 11) + SourceIndex(0)
+5 >Emitted(33, 23) Source(5, 25) + SourceIndex(0)
+6 >Emitted(33, 24) Source(5, 26) + SourceIndex(0)
 ---
 >>>console.log(s);
 1 >
@@ -896,14 +920,14 @@ sourceFile:../../../first/first_PART1.ts
 6 >            s
 7 >             )
 8 >              ;
-1 >Emitted(33, 1) Source(11, 1) + SourceIndex(0)
-2 >Emitted(33, 8) Source(11, 8) + SourceIndex(0)
-3 >Emitted(33, 9) Source(11, 9) + SourceIndex(0)
-4 >Emitted(33, 12) Source(11, 12) + SourceIndex(0)
-5 >Emitted(33, 13) Source(11, 13) + SourceIndex(0)
-6 >Emitted(33, 14) Source(11, 14) + SourceIndex(0)
-7 >Emitted(33, 15) Source(11, 15) + SourceIndex(0)
-8 >Emitted(33, 16) Source(11, 16) + SourceIndex(0)
+1 >Emitted(34, 1) Source(11, 1) + SourceIndex(0)
+2 >Emitted(34, 8) Source(11, 8) + SourceIndex(0)
+3 >Emitted(34, 9) Source(11, 9) + SourceIndex(0)
+4 >Emitted(34, 12) Source(11, 12) + SourceIndex(0)
+5 >Emitted(34, 13) Source(11, 13) + SourceIndex(0)
+6 >Emitted(34, 14) Source(11, 14) + SourceIndex(0)
+7 >Emitted(34, 15) Source(11, 15) + SourceIndex(0)
+8 >Emitted(34, 16) Source(11, 16) + SourceIndex(0)
 ---
 >>>function forfirstfirst_PART1Rest() { }
 1->
@@ -917,11 +941,11 @@ sourceFile:../../../first/first_PART1.ts
 3 >         forfirstfirst_PART1Rest
 4 >                                () { 
 5 >                                     }
-1->Emitted(34, 1) Source(12, 1) + SourceIndex(0)
-2 >Emitted(34, 10) Source(12, 10) + SourceIndex(0)
-3 >Emitted(34, 33) Source(12, 33) + SourceIndex(0)
-4 >Emitted(34, 38) Source(12, 38) + SourceIndex(0)
-5 >Emitted(34, 39) Source(12, 39) + SourceIndex(0)
+1->Emitted(35, 1) Source(12, 1) + SourceIndex(0)
+2 >Emitted(35, 10) Source(12, 10) + SourceIndex(0)
+3 >Emitted(35, 33) Source(12, 33) + SourceIndex(0)
+4 >Emitted(35, 38) Source(12, 38) + SourceIndex(0)
+5 >Emitted(35, 39) Source(12, 39) + SourceIndex(0)
 ---
 -------------------------------------------------------------------
 emittedFile:/src/third/thirdjs/output/third-output.js
@@ -946,15 +970,15 @@ sourceFile:../../../first/first_part2.ts
 7 >             ()
 8 >               )
 9 >                ;
-1 >Emitted(35, 1) Source(1, 1) + SourceIndex(1)
-2 >Emitted(35, 8) Source(1, 8) + SourceIndex(1)
-3 >Emitted(35, 9) Source(1, 9) + SourceIndex(1)
-4 >Emitted(35, 12) Source(1, 12) + SourceIndex(1)
-5 >Emitted(35, 13) Source(1, 13) + SourceIndex(1)
-6 >Emitted(35, 14) Source(1, 14) + SourceIndex(1)
-7 >Emitted(35, 16) Source(1, 16) + SourceIndex(1)
-8 >Emitted(35, 17) Source(1, 17) + SourceIndex(1)
-9 >Emitted(35, 18) Source(1, 18) + SourceIndex(1)
+1 >Emitted(36, 1) Source(1, 1) + SourceIndex(1)
+2 >Emitted(36, 8) Source(1, 8) + SourceIndex(1)
+3 >Emitted(36, 9) Source(1, 9) + SourceIndex(1)
+4 >Emitted(36, 12) Source(1, 12) + SourceIndex(1)
+5 >Emitted(36, 13) Source(1, 13) + SourceIndex(1)
+6 >Emitted(36, 14) Source(1, 14) + SourceIndex(1)
+7 >Emitted(36, 16) Source(1, 16) + SourceIndex(1)
+8 >Emitted(36, 17) Source(1, 17) + SourceIndex(1)
+9 >Emitted(36, 18) Source(1, 18) + SourceIndex(1)
 ---
 -------------------------------------------------------------------
 emittedFile:/src/third/thirdjs/output/third-output.js
@@ -968,9 +992,9 @@ sourceFile:../../../first/first_part3.ts
 1 >
 2 >function 
 3 >         f
-1 >Emitted(36, 1) Source(1, 1) + SourceIndex(2)
-2 >Emitted(36, 10) Source(1, 10) + SourceIndex(2)
-3 >Emitted(36, 11) Source(1, 11) + SourceIndex(2)
+1 >Emitted(37, 1) Source(1, 1) + SourceIndex(2)
+2 >Emitted(37, 10) Source(1, 10) + SourceIndex(2)
+3 >Emitted(37, 11) Source(1, 11) + SourceIndex(2)
 ---
 >>>    return "JS does hoists";
 1->^^^^
@@ -982,10 +1006,10 @@ sourceFile:../../../first/first_part3.ts
 2 >    return 
 3 >           "JS does hoists"
 4 >                           ;
-1->Emitted(37, 5) Source(2, 5) + SourceIndex(2)
-2 >Emitted(37, 12) Source(2, 12) + SourceIndex(2)
-3 >Emitted(37, 28) Source(2, 28) + SourceIndex(2)
-4 >Emitted(37, 29) Source(2, 29) + SourceIndex(2)
+1->Emitted(38, 5) Source(2, 5) + SourceIndex(2)
+2 >Emitted(38, 12) Source(2, 12) + SourceIndex(2)
+3 >Emitted(38, 28) Source(2, 28) + SourceIndex(2)
+4 >Emitted(38, 29) Source(2, 29) + SourceIndex(2)
 ---
 >>>}
 1 >
@@ -994,8 +1018,8 @@ sourceFile:../../../first/first_part3.ts
 1 >
   >
 2 >}
-1 >Emitted(38, 1) Source(3, 1) + SourceIndex(2)
-2 >Emitted(38, 2) Source(3, 2) + SourceIndex(2)
+1 >Emitted(39, 1) Source(3, 1) + SourceIndex(2)
+2 >Emitted(39, 2) Source(3, 2) + SourceIndex(2)
 ---
 -------------------------------------------------------------------
 emittedFile:/src/third/thirdjs/output/third-output.js
@@ -1021,10 +1045,10 @@ sourceFile:../../../second/second_part1.ts
   >     
   >         f();
   >     }
-1->Emitted(39, 1) Source(5, 1) + SourceIndex(3)
-2 >Emitted(39, 5) Source(5, 11) + SourceIndex(3)
-3 >Emitted(39, 6) Source(5, 12) + SourceIndex(3)
-4 >Emitted(39, 7) Source(11, 2) + SourceIndex(3)
+1->Emitted(40, 1) Source(5, 1) + SourceIndex(3)
+2 >Emitted(40, 5) Source(5, 11) + SourceIndex(3)
+3 >Emitted(40, 6) Source(5, 12) + SourceIndex(3)
+4 >Emitted(40, 7) Source(11, 2) + SourceIndex(3)
 ---
 >>>(function (N) {
 1->
@@ -1034,9 +1058,9 @@ sourceFile:../../../second/second_part1.ts
 1->
 2 >namespace 
 3 >           N
-1->Emitted(40, 1) Source(5, 1) + SourceIndex(3)
-2 >Emitted(40, 12) Source(5, 11) + SourceIndex(3)
-3 >Emitted(40, 13) Source(5, 12) + SourceIndex(3)
+1->Emitted(41, 1) Source(5, 1) + SourceIndex(3)
+2 >Emitted(41, 12) Source(5, 11) + SourceIndex(3)
+3 >Emitted(41, 13) Source(5, 12) + SourceIndex(3)
 ---
 >>>    function f() {
 1->^^^^
@@ -1047,9 +1071,9 @@ sourceFile:../../../second/second_part1.ts
   >    
 2 >    function 
 3 >             f
-1->Emitted(41, 5) Source(6, 5) + SourceIndex(3)
-2 >Emitted(41, 14) Source(6, 14) + SourceIndex(3)
-3 >Emitted(41, 15) Source(6, 15) + SourceIndex(3)
+1->Emitted(42, 5) Source(6, 5) + SourceIndex(3)
+2 >Emitted(42, 14) Source(6, 14) + SourceIndex(3)
+3 >Emitted(42, 15) Source(6, 15) + SourceIndex(3)
 ---
 >>>        console.log('testing');
 1->^^^^^^^^
@@ -1069,14 +1093,14 @@ sourceFile:../../../second/second_part1.ts
 6 >                    'testing'
 7 >                             )
 8 >                              ;
-1->Emitted(42, 9) Source(7, 9) + SourceIndex(3)
-2 >Emitted(42, 16) Source(7, 16) + SourceIndex(3)
-3 >Emitted(42, 17) Source(7, 17) + SourceIndex(3)
-4 >Emitted(42, 20) Source(7, 20) + SourceIndex(3)
-5 >Emitted(42, 21) Source(7, 21) + SourceIndex(3)
-6 >Emitted(42, 30) Source(7, 30) + SourceIndex(3)
-7 >Emitted(42, 31) Source(7, 31) + SourceIndex(3)
-8 >Emitted(42, 32) Source(7, 32) + SourceIndex(3)
+1->Emitted(43, 9) Source(7, 9) + SourceIndex(3)
+2 >Emitted(43, 16) Source(7, 16) + SourceIndex(3)
+3 >Emitted(43, 17) Source(7, 17) + SourceIndex(3)
+4 >Emitted(43, 20) Source(7, 20) + SourceIndex(3)
+5 >Emitted(43, 21) Source(7, 21) + SourceIndex(3)
+6 >Emitted(43, 30) Source(7, 30) + SourceIndex(3)
+7 >Emitted(43, 31) Source(7, 31) + SourceIndex(3)
+8 >Emitted(43, 32) Source(7, 32) + SourceIndex(3)
 ---
 >>>    }
 1 >^^^^
@@ -1085,8 +1109,8 @@ sourceFile:../../../second/second_part1.ts
 1 >
   >    
 2 >    }
-1 >Emitted(43, 5) Source(8, 5) + SourceIndex(3)
-2 >Emitted(43, 6) Source(8, 6) + SourceIndex(3)
+1 >Emitted(44, 5) Source(8, 5) + SourceIndex(3)
+2 >Emitted(44, 6) Source(8, 6) + SourceIndex(3)
 ---
 >>>    f();
 1->^^^^
@@ -1100,10 +1124,10 @@ sourceFile:../../../second/second_part1.ts
 2 >    f
 3 >     ()
 4 >       ;
-1->Emitted(44, 5) Source(10, 5) + SourceIndex(3)
-2 >Emitted(44, 6) Source(10, 6) + SourceIndex(3)
-3 >Emitted(44, 8) Source(10, 8) + SourceIndex(3)
-4 >Emitted(44, 9) Source(10, 9) + SourceIndex(3)
+1->Emitted(45, 5) Source(10, 5) + SourceIndex(3)
+2 >Emitted(45, 6) Source(10, 6) + SourceIndex(3)
+3 >Emitted(45, 8) Source(10, 8) + SourceIndex(3)
+4 >Emitted(45, 9) Source(10, 9) + SourceIndex(3)
 ---
 >>>})(N || (N = {}));
 1->
@@ -1128,13 +1152,13 @@ sourceFile:../../../second/second_part1.ts
   >          
   >              f();
   >          }
-1->Emitted(45, 1) Source(11, 1) + SourceIndex(3)
-2 >Emitted(45, 2) Source(11, 2) + SourceIndex(3)
-3 >Emitted(45, 4) Source(5, 11) + SourceIndex(3)
-4 >Emitted(45, 5) Source(5, 12) + SourceIndex(3)
-5 >Emitted(45, 10) Source(5, 11) + SourceIndex(3)
-6 >Emitted(45, 11) Source(5, 12) + SourceIndex(3)
-7 >Emitted(45, 19) Source(11, 2) + SourceIndex(3)
+1->Emitted(46, 1) Source(11, 1) + SourceIndex(3)
+2 >Emitted(46, 2) Source(11, 2) + SourceIndex(3)
+3 >Emitted(46, 4) Source(5, 11) + SourceIndex(3)
+4 >Emitted(46, 5) Source(5, 12) + SourceIndex(3)
+5 >Emitted(46, 10) Source(5, 11) + SourceIndex(3)
+6 >Emitted(46, 11) Source(5, 12) + SourceIndex(3)
+7 >Emitted(46, 19) Source(11, 2) + SourceIndex(3)
 ---
 >>>function secondsecond_part1Spread() {
 1->
@@ -1145,9 +1169,9 @@ sourceFile:../../../second/second_part1.ts
   >
 2 >function 
 3 >         secondsecond_part1Spread
-1->Emitted(46, 1) Source(13, 1) + SourceIndex(3)
-2 >Emitted(46, 10) Source(13, 10) + SourceIndex(3)
-3 >Emitted(46, 34) Source(13, 34) + SourceIndex(3)
+1->Emitted(47, 1) Source(13, 1) + SourceIndex(3)
+2 >Emitted(47, 10) Source(13, 10) + SourceIndex(3)
+3 >Emitted(47, 34) Source(13, 34) + SourceIndex(3)
 ---
 >>>    var b = [];
 1 >^^^^
@@ -1155,8 +1179,8 @@ sourceFile:../../../second/second_part1.ts
 3 >               ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^->
 1 >(
 2 >    ...b: number[]
-1 >Emitted(47, 5) Source(13, 35) + SourceIndex(3)
-2 >Emitted(47, 16) Source(13, 49) + SourceIndex(3)
+1 >Emitted(48, 5) Source(13, 35) + SourceIndex(3)
+2 >Emitted(48, 16) Source(13, 49) + SourceIndex(3)
 ---
 >>>    for (var _i = 0; _i < arguments.length; _i++) {
 1->^^^^^^^^^
@@ -1171,66 +1195,88 @@ sourceFile:../../../second/second_part1.ts
 4 >                     ...b: number[]
 5 >                                          
 6 >                                            ...b: number[]
-1->Emitted(48, 10) Source(13, 35) + SourceIndex(3)
-2 >Emitted(48, 20) Source(13, 49) + SourceIndex(3)
-3 >Emitted(48, 22) Source(13, 35) + SourceIndex(3)
-4 >Emitted(48, 43) Source(13, 49) + SourceIndex(3)
-5 >Emitted(48, 45) Source(13, 35) + SourceIndex(3)
-6 >Emitted(48, 49) Source(13, 49) + SourceIndex(3)
+1->Emitted(49, 10) Source(13, 35) + SourceIndex(3)
+2 >Emitted(49, 20) Source(13, 49) + SourceIndex(3)
+3 >Emitted(49, 22) Source(13, 35) + SourceIndex(3)
+4 >Emitted(49, 43) Source(13, 49) + SourceIndex(3)
+5 >Emitted(49, 45) Source(13, 35) + SourceIndex(3)
+6 >Emitted(49, 49) Source(13, 49) + SourceIndex(3)
 ---
 >>>        b[_i] = arguments[_i];
 1 >^^^^^^^^
 2 >        ^^^^^^^^^^^^^^^^^^^^^^
 1 >
 2 >        ...b: number[]
-1 >Emitted(49, 9) Source(13, 35) + SourceIndex(3)
-2 >Emitted(49, 31) Source(13, 49) + SourceIndex(3)
+1 >Emitted(50, 9) Source(13, 35) + SourceIndex(3)
+2 >Emitted(50, 31) Source(13, 49) + SourceIndex(3)
 ---
 >>>    }
 >>>}
 1 >
 2 >^
-3 > ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^->
+3 > ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^->
 1 >) { 
 2 >}
-1 >Emitted(51, 1) Source(13, 53) + SourceIndex(3)
-2 >Emitted(51, 2) Source(13, 54) + SourceIndex(3)
+1 >Emitted(52, 1) Source(13, 53) + SourceIndex(3)
+2 >Emitted(52, 2) Source(13, 54) + SourceIndex(3)
 ---
->>>secondsecond_part1Spread.apply(void 0, __spread([10, 20, 30]));
+>>>var secondsecond_part1_ar = [20, 30];
+1->
+2 >^^^^
+3 >    ^^^^^^^^^^^^^^^^^^^^^
+4 >                         ^^^
+5 >                            ^
+6 >                             ^^
+7 >                               ^^
+8 >                                 ^^
+9 >                                   ^
+10>                                    ^
+11>                                     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^->
+1->
+  >
+2 >const 
+3 >    secondsecond_part1_ar
+4 >                          = 
+5 >                            [
+6 >                             20
+7 >                               , 
+8 >                                 30
+9 >                                   ]
+10>                                    ;
+1->Emitted(53, 1) Source(14, 1) + SourceIndex(3)
+2 >Emitted(53, 5) Source(14, 7) + SourceIndex(3)
+3 >Emitted(53, 26) Source(14, 28) + SourceIndex(3)
+4 >Emitted(53, 29) Source(14, 31) + SourceIndex(3)
+5 >Emitted(53, 30) Source(14, 32) + SourceIndex(3)
+6 >Emitted(53, 32) Source(14, 34) + SourceIndex(3)
+7 >Emitted(53, 34) Source(14, 36) + SourceIndex(3)
+8 >Emitted(53, 36) Source(14, 38) + SourceIndex(3)
+9 >Emitted(53, 37) Source(14, 39) + SourceIndex(3)
+10>Emitted(53, 38) Source(14, 40) + SourceIndex(3)
+---
+>>>secondsecond_part1Spread.apply(void 0, __spreadArray([10], __read(secondsecond_part1_ar)));
 1->
 2 >^^^^^^^^^^^^^^^^^^^^^^^^
-3 >                        ^^^^^^^^^^^^^^^^^^^^^^^^
-4 >                                                ^
-5 >                                                 ^^
-6 >                                                   ^^
-7 >                                                     ^^
-8 >                                                       ^^
-9 >                                                         ^^
-10>                                                           ^
-11>                                                            ^^^
+3 >                        ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+4 >                                                      ^^
+5 >                                                        ^^^^^^^^^^
+6 >                                                                  ^^^^^^^^^^^^^^^^^^^^^
+7 >                                                                                       ^^^^
 1->
   >
 2 >secondsecond_part1Spread
-3 >                        (...
-4 >                                                [
-5 >                                                 10
-6 >                                                   , 
-7 >                                                     20
-8 >                                                       , 
-9 >                                                         30
-10>                                                           ]
-11>                                                            );
-1->Emitted(52, 1) Source(14, 1) + SourceIndex(3)
-2 >Emitted(52, 25) Source(14, 25) + SourceIndex(3)
-3 >Emitted(52, 49) Source(14, 29) + SourceIndex(3)
-4 >Emitted(52, 50) Source(14, 30) + SourceIndex(3)
-5 >Emitted(52, 52) Source(14, 32) + SourceIndex(3)
-6 >Emitted(52, 54) Source(14, 34) + SourceIndex(3)
-7 >Emitted(52, 56) Source(14, 36) + SourceIndex(3)
-8 >Emitted(52, 58) Source(14, 38) + SourceIndex(3)
-9 >Emitted(52, 60) Source(14, 40) + SourceIndex(3)
-10>Emitted(52, 61) Source(14, 41) + SourceIndex(3)
-11>Emitted(52, 64) Source(14, 43) + SourceIndex(3)
+3 >                        (
+4 >                                                      10
+5 >                                                        , ...
+6 >                                                                  secondsecond_part1_ar
+7 >                                                                                       );
+1->Emitted(54, 1) Source(15, 1) + SourceIndex(3)
+2 >Emitted(54, 25) Source(15, 25) + SourceIndex(3)
+3 >Emitted(54, 55) Source(15, 26) + SourceIndex(3)
+4 >Emitted(54, 57) Source(15, 28) + SourceIndex(3)
+5 >Emitted(54, 67) Source(15, 33) + SourceIndex(3)
+6 >Emitted(54, 88) Source(15, 54) + SourceIndex(3)
+7 >Emitted(54, 92) Source(15, 56) + SourceIndex(3)
 ---
 -------------------------------------------------------------------
 emittedFile:/src/third/thirdjs/output/third-output.js
@@ -1240,13 +1286,13 @@ sourceFile:../../../second/second_part2.ts
 1 >
 2 >^^^^^^^^^^^^^^^^^^^->
 1 >
-1 >Emitted(53, 1) Source(1, 1) + SourceIndex(4)
+1 >Emitted(55, 1) Source(1, 1) + SourceIndex(4)
 ---
 >>>    function C() {
 1->^^^^
 2 >    ^^->
 1->
-1->Emitted(54, 5) Source(1, 1) + SourceIndex(4)
+1->Emitted(56, 5) Source(1, 1) + SourceIndex(4)
 ---
 >>>    }
 1->^^^^
@@ -1258,8 +1304,8 @@ sourceFile:../../../second/second_part2.ts
   >    }
   >
 2 >    }
-1->Emitted(55, 5) Source(5, 1) + SourceIndex(4)
-2 >Emitted(55, 6) Source(5, 2) + SourceIndex(4)
+1->Emitted(57, 5) Source(5, 1) + SourceIndex(4)
+2 >Emitted(57, 6) Source(5, 2) + SourceIndex(4)
 ---
 >>>    C.prototype.doSomething = function () {
 1->^^^^
@@ -1269,9 +1315,9 @@ sourceFile:../../../second/second_part2.ts
 1->
 2 >    doSomething
 3 >                           
-1->Emitted(56, 5) Source(2, 5) + SourceIndex(4)
-2 >Emitted(56, 28) Source(2, 16) + SourceIndex(4)
-3 >Emitted(56, 31) Source(2, 5) + SourceIndex(4)
+1->Emitted(58, 5) Source(2, 5) + SourceIndex(4)
+2 >Emitted(58, 28) Source(2, 16) + SourceIndex(4)
+3 >Emitted(58, 31) Source(2, 5) + SourceIndex(4)
 ---
 >>>        console.log("something got done");
 1->^^^^^^^^
@@ -1291,14 +1337,14 @@ sourceFile:../../../second/second_part2.ts
 6 >                    "something got done"
 7 >                                        )
 8 >                                         ;
-1->Emitted(57, 9) Source(3, 9) + SourceIndex(4)
-2 >Emitted(57, 16) Source(3, 16) + SourceIndex(4)
-3 >Emitted(57, 17) Source(3, 17) + SourceIndex(4)
-4 >Emitted(57, 20) Source(3, 20) + SourceIndex(4)
-5 >Emitted(57, 21) Source(3, 21) + SourceIndex(4)
-6 >Emitted(57, 41) Source(3, 41) + SourceIndex(4)
-7 >Emitted(57, 42) Source(3, 42) + SourceIndex(4)
-8 >Emitted(57, 43) Source(3, 43) + SourceIndex(4)
+1->Emitted(59, 9) Source(3, 9) + SourceIndex(4)
+2 >Emitted(59, 16) Source(3, 16) + SourceIndex(4)
+3 >Emitted(59, 17) Source(3, 17) + SourceIndex(4)
+4 >Emitted(59, 20) Source(3, 20) + SourceIndex(4)
+5 >Emitted(59, 21) Source(3, 21) + SourceIndex(4)
+6 >Emitted(59, 41) Source(3, 41) + SourceIndex(4)
+7 >Emitted(59, 42) Source(3, 42) + SourceIndex(4)
+8 >Emitted(59, 43) Source(3, 43) + SourceIndex(4)
 ---
 >>>    };
 1 >^^^^
@@ -1307,8 +1353,8 @@ sourceFile:../../../second/second_part2.ts
 1 >
   >    
 2 >    }
-1 >Emitted(58, 5) Source(4, 5) + SourceIndex(4)
-2 >Emitted(58, 6) Source(4, 6) + SourceIndex(4)
+1 >Emitted(60, 5) Source(4, 5) + SourceIndex(4)
+2 >Emitted(60, 6) Source(4, 6) + SourceIndex(4)
 ---
 >>>    return C;
 1->^^^^
@@ -1316,8 +1362,8 @@ sourceFile:../../../second/second_part2.ts
 1->
   >
 2 >    }
-1->Emitted(59, 5) Source(5, 1) + SourceIndex(4)
-2 >Emitted(59, 13) Source(5, 2) + SourceIndex(4)
+1->Emitted(61, 5) Source(5, 1) + SourceIndex(4)
+2 >Emitted(61, 13) Source(5, 2) + SourceIndex(4)
 ---
 >>>}());
 1 >
@@ -1333,10 +1379,10 @@ sourceFile:../../../second/second_part2.ts
   >         console.log("something got done");
   >     }
   > }
-1 >Emitted(60, 1) Source(5, 1) + SourceIndex(4)
-2 >Emitted(60, 2) Source(5, 2) + SourceIndex(4)
-3 >Emitted(60, 2) Source(1, 1) + SourceIndex(4)
-4 >Emitted(60, 6) Source(5, 2) + SourceIndex(4)
+1 >Emitted(62, 1) Source(5, 1) + SourceIndex(4)
+2 >Emitted(62, 2) Source(5, 2) + SourceIndex(4)
+3 >Emitted(62, 2) Source(1, 1) + SourceIndex(4)
+4 >Emitted(62, 6) Source(5, 2) + SourceIndex(4)
 ---
 -------------------------------------------------------------------
 emittedFile:/src/third/thirdjs/output/third-output.js
@@ -1360,14 +1406,14 @@ sourceFile:../../third_part1.ts
 6 >            C
 7 >             ()
 8 >               ;
-1->Emitted(61, 1) Source(1, 1) + SourceIndex(5)
-2 >Emitted(61, 5) Source(1, 5) + SourceIndex(5)
-3 >Emitted(61, 6) Source(1, 6) + SourceIndex(5)
-4 >Emitted(61, 9) Source(1, 9) + SourceIndex(5)
-5 >Emitted(61, 13) Source(1, 13) + SourceIndex(5)
-6 >Emitted(61, 14) Source(1, 14) + SourceIndex(5)
-7 >Emitted(61, 16) Source(1, 16) + SourceIndex(5)
-8 >Emitted(61, 17) Source(1, 17) + SourceIndex(5)
+1->Emitted(63, 1) Source(1, 1) + SourceIndex(5)
+2 >Emitted(63, 5) Source(1, 5) + SourceIndex(5)
+3 >Emitted(63, 6) Source(1, 6) + SourceIndex(5)
+4 >Emitted(63, 9) Source(1, 9) + SourceIndex(5)
+5 >Emitted(63, 13) Source(1, 13) + SourceIndex(5)
+6 >Emitted(63, 14) Source(1, 14) + SourceIndex(5)
+7 >Emitted(63, 16) Source(1, 16) + SourceIndex(5)
+8 >Emitted(63, 17) Source(1, 17) + SourceIndex(5)
 ---
 >>>c.doSomething();
 1->
@@ -1384,12 +1430,12 @@ sourceFile:../../third_part1.ts
 4 >  doSomething
 5 >             ()
 6 >               ;
-1->Emitted(62, 1) Source(2, 1) + SourceIndex(5)
-2 >Emitted(62, 2) Source(2, 2) + SourceIndex(5)
-3 >Emitted(62, 3) Source(2, 3) + SourceIndex(5)
-4 >Emitted(62, 14) Source(2, 14) + SourceIndex(5)
-5 >Emitted(62, 16) Source(2, 16) + SourceIndex(5)
-6 >Emitted(62, 17) Source(2, 17) + SourceIndex(5)
+1->Emitted(64, 1) Source(2, 1) + SourceIndex(5)
+2 >Emitted(64, 2) Source(2, 2) + SourceIndex(5)
+3 >Emitted(64, 3) Source(2, 3) + SourceIndex(5)
+4 >Emitted(64, 14) Source(2, 14) + SourceIndex(5)
+5 >Emitted(64, 16) Source(2, 16) + SourceIndex(5)
+6 >Emitted(64, 17) Source(2, 17) + SourceIndex(5)
 ---
 >>>function forthirdthird_part1Rest() {
 1->
@@ -1400,9 +1446,9 @@ sourceFile:../../third_part1.ts
   >
 2 >function 
 3 >         forthirdthird_part1Rest
-1->Emitted(63, 1) Source(3, 1) + SourceIndex(5)
-2 >Emitted(63, 10) Source(3, 10) + SourceIndex(5)
-3 >Emitted(63, 33) Source(3, 33) + SourceIndex(5)
+1->Emitted(65, 1) Source(3, 1) + SourceIndex(5)
+2 >Emitted(65, 10) Source(3, 10) + SourceIndex(5)
+3 >Emitted(65, 33) Source(3, 33) + SourceIndex(5)
 ---
 >>>    var _a = { a: 10, b: 30, yy: 30 }, b = _a.b, rest = __rest(_a, ["b"]);
 1->^^^^
@@ -1456,31 +1502,31 @@ sourceFile:../../third_part1.ts
 23>                                                                   { b, ...rest }
 24>                                                                         = { a: 10, b: 30, yy: 30 }
 25>                                                                         ;
-1->Emitted(64, 5) Source(4, 1) + SourceIndex(5)
-2 >Emitted(64, 9) Source(4, 7) + SourceIndex(5)
-3 >Emitted(64, 14) Source(4, 24) + SourceIndex(5)
-4 >Emitted(64, 16) Source(4, 26) + SourceIndex(5)
-5 >Emitted(64, 17) Source(4, 27) + SourceIndex(5)
-6 >Emitted(64, 19) Source(4, 29) + SourceIndex(5)
-7 >Emitted(64, 21) Source(4, 31) + SourceIndex(5)
-8 >Emitted(64, 23) Source(4, 33) + SourceIndex(5)
-9 >Emitted(64, 24) Source(4, 34) + SourceIndex(5)
-10>Emitted(64, 26) Source(4, 36) + SourceIndex(5)
-11>Emitted(64, 28) Source(4, 38) + SourceIndex(5)
-12>Emitted(64, 30) Source(4, 40) + SourceIndex(5)
-13>Emitted(64, 32) Source(4, 42) + SourceIndex(5)
-14>Emitted(64, 34) Source(4, 44) + SourceIndex(5)
-15>Emitted(64, 36) Source(4, 46) + SourceIndex(5)
-16>Emitted(64, 38) Source(4, 48) + SourceIndex(5)
-17>Emitted(64, 40) Source(4, 9) + SourceIndex(5)
-18>Emitted(64, 41) Source(4, 10) + SourceIndex(5)
-19>Emitted(64, 48) Source(4, 10) + SourceIndex(5)
-20>Emitted(64, 50) Source(4, 15) + SourceIndex(5)
-21>Emitted(64, 54) Source(4, 19) + SourceIndex(5)
-22>Emitted(64, 68) Source(4, 7) + SourceIndex(5)
-23>Emitted(64, 73) Source(4, 21) + SourceIndex(5)
-24>Emitted(64, 74) Source(4, 48) + SourceIndex(5)
-25>Emitted(64, 75) Source(4, 49) + SourceIndex(5)
+1->Emitted(66, 5) Source(4, 1) + SourceIndex(5)
+2 >Emitted(66, 9) Source(4, 7) + SourceIndex(5)
+3 >Emitted(66, 14) Source(4, 24) + SourceIndex(5)
+4 >Emitted(66, 16) Source(4, 26) + SourceIndex(5)
+5 >Emitted(66, 17) Source(4, 27) + SourceIndex(5)
+6 >Emitted(66, 19) Source(4, 29) + SourceIndex(5)
+7 >Emitted(66, 21) Source(4, 31) + SourceIndex(5)
+8 >Emitted(66, 23) Source(4, 33) + SourceIndex(5)
+9 >Emitted(66, 24) Source(4, 34) + SourceIndex(5)
+10>Emitted(66, 26) Source(4, 36) + SourceIndex(5)
+11>Emitted(66, 28) Source(4, 38) + SourceIndex(5)
+12>Emitted(66, 30) Source(4, 40) + SourceIndex(5)
+13>Emitted(66, 32) Source(4, 42) + SourceIndex(5)
+14>Emitted(66, 34) Source(4, 44) + SourceIndex(5)
+15>Emitted(66, 36) Source(4, 46) + SourceIndex(5)
+16>Emitted(66, 38) Source(4, 48) + SourceIndex(5)
+17>Emitted(66, 40) Source(4, 9) + SourceIndex(5)
+18>Emitted(66, 41) Source(4, 10) + SourceIndex(5)
+19>Emitted(66, 48) Source(4, 10) + SourceIndex(5)
+20>Emitted(66, 50) Source(4, 15) + SourceIndex(5)
+21>Emitted(66, 54) Source(4, 19) + SourceIndex(5)
+22>Emitted(66, 68) Source(4, 7) + SourceIndex(5)
+23>Emitted(66, 73) Source(4, 21) + SourceIndex(5)
+24>Emitted(66, 74) Source(4, 48) + SourceIndex(5)
+25>Emitted(66, 75) Source(4, 49) + SourceIndex(5)
 ---
 >>>}
 1 >
@@ -1489,8 +1535,8 @@ sourceFile:../../third_part1.ts
 1 >
   >
 2 >}
-1 >Emitted(65, 1) Source(5, 1) + SourceIndex(5)
-2 >Emitted(65, 2) Source(5, 2) + SourceIndex(5)
+1 >Emitted(67, 1) Source(5, 1) + SourceIndex(5)
+2 >Emitted(67, 2) Source(5, 2) + SourceIndex(5)
 ---
 >>>//# sourceMappingURL=third-output.js.map
 
@@ -1511,45 +1557,45 @@ sourceFile:../../third_part1.ts
         },
         {
           "pos": 506,
-          "end": 676,
+          "end": 697,
           "kind": "emitHelpers",
-          "data": "typescript:spread"
+          "data": "typescript:spreadArray"
         },
         {
-          "pos": 678,
-          "end": 1178,
+          "pos": 699,
+          "end": 1199,
           "kind": "emitHelpers",
           "data": "typescript:rest"
         },
         {
-          "pos": 1180,
-          "end": 1330,
+          "pos": 1201,
+          "end": 1351,
           "kind": "prepend",
           "data": "../../../first/bin/first-output.js",
           "texts": [
             {
-              "pos": 1180,
-              "end": 1330,
+              "pos": 1201,
+              "end": 1351,
               "kind": "text"
             }
           ]
         },
         {
-          "pos": 1330,
-          "end": 1831,
+          "pos": 1351,
+          "end": 1919,
           "kind": "prepend",
           "data": "../../../2/second-output.js",
           "texts": [
             {
-              "pos": 1330,
-              "end": 1831,
+              "pos": 1351,
+              "end": 1919,
               "kind": "text"
             }
           ]
         },
         {
-          "pos": 1831,
-          "end": 1984,
+          "pos": 1919,
+          "end": 2072,
           "kind": "text"
         }
       ],
@@ -1576,20 +1622,20 @@ sourceFile:../../third_part1.ts
         },
         {
           "pos": 208,
-          "end": 374,
+          "end": 422,
           "kind": "prepend",
           "data": "../../../2/second-output.d.ts",
           "texts": [
             {
               "pos": 208,
-              "end": 374,
+              "end": 422,
               "kind": "text"
             }
           ]
         },
         {
-          "pos": 374,
-          "end": 444,
+          "pos": 422,
+          "end": 492,
           "kind": "text"
         }
       ]
@@ -1620,13 +1666,14 @@ var __read = (this && this.__read) || function (o, n) {
     return ar;
 };
 ----------------------------------------------------------------------
-emitHelpers: (506-676):: typescript:spread
-var __spread = (this && this.__spread) || function () {
-    for (var ar = [], i = 0; i < arguments.length; i++) ar = ar.concat(__read(arguments[i]));
-    return ar;
+emitHelpers: (506-697):: typescript:spreadArray
+var __spreadArray = (this && this.__spreadArray) || function (to, from) {
+    for (var i = 0, il = from.length, j = to.length; i < il; i++, j++)
+        to[j] = from[i];
+    return to;
 };
 ----------------------------------------------------------------------
-emitHelpers: (678-1178):: typescript:rest
+emitHelpers: (699-1199):: typescript:rest
 var __rest = (this && this.__rest) || function (s, e) {
     var t = {};
     for (var p in s) if (Object.prototype.hasOwnProperty.call(s, p) && e.indexOf(p) < 0)
@@ -1639,9 +1686,9 @@ var __rest = (this && this.__rest) || function (s, e) {
     return t;
 };
 ----------------------------------------------------------------------
-prepend: (1180-1330):: ../../../first/bin/first-output.js texts:: 1
+prepend: (1201-1351):: ../../../first/bin/first-output.js texts:: 1
 >>--------------------------------------------------------------------
-text: (1180-1330)
+text: (1201-1351)
 var s = "Hello, world";
 console.log(s);
 function forfirstfirst_PART1Rest() { }
@@ -1651,9 +1698,9 @@ function f() {
 }
 
 ----------------------------------------------------------------------
-prepend: (1330-1831):: ../../../2/second-output.js texts:: 1
+prepend: (1351-1919):: ../../../2/second-output.js texts:: 1
 >>--------------------------------------------------------------------
-text: (1330-1831)
+text: (1351-1919)
 var N;
 (function (N) {
     function f() {
@@ -1667,7 +1714,8 @@ function secondsecond_part1Spread() {
         b[_i] = arguments[_i];
     }
 }
-secondsecond_part1Spread.apply(void 0, __spread([10, 20, 30]));
+var secondsecond_part1_ar = [20, 30];
+secondsecond_part1Spread.apply(void 0, __spreadArray([10], __read(secondsecond_part1_ar)));
 var C = (function () {
     function C() {
     }
@@ -1678,7 +1726,7 @@ var C = (function () {
 }());
 
 ----------------------------------------------------------------------
-text: (1831-1984)
+text: (1919-2072)
 var c = new C();
 c.doSomething();
 function forthirdthird_part1Rest() {
@@ -1703,20 +1751,21 @@ declare function forfirstfirst_PART1Rest(): void;
 declare function f(): string;
 
 ----------------------------------------------------------------------
-prepend: (208-374):: ../../../2/second-output.d.ts texts:: 1
+prepend: (208-422):: ../../../2/second-output.d.ts texts:: 1
 >>--------------------------------------------------------------------
-text: (208-374)
+text: (208-422)
 declare namespace N {
 }
 declare namespace N {
 }
 declare function secondsecond_part1Spread(...b: number[]): void;
+declare const secondsecond_part1_ar: number[];
 declare class C {
     doSomething(): void;
 }
 
 ----------------------------------------------------------------------
-text: (374-444)
+text: (422-492)
 declare var c: C;
 declare function forthirdthird_part1Rest(): void;
 

tests/baselines/reference/tsxEmit1.js

@@ -41,12 +41,10 @@ var whitespace3 = <div>
 
 
 //// [file.jsx]
-var __spreadArrays = (this && this.__spreadArrays) || function () {
-    for (var s = 0, i = 0, il = arguments.length; i < il; i++) s += arguments[i].length;
-    for (var r = Array(s), k = 0, i = 0; i < il; i++)
-        for (var a = arguments[i], j = 0, jl = a.length; j < jl; j++, k++)
-            r[k] = a[j];
-    return r;
+var __spreadArray = (this && this.__spreadArray) || function (to, from) {
+    for (var i = 0, il = from.length, j = to.length; i < il; i++, j++)
+        to[j] = from[i];
+    return to;
 };
 var p;
 var selfClosed1 = <div />;
@@ -67,10 +65,10 @@ var SomeClass = /** @class */ (function () {
     SomeClass.prototype.f = function () {
         var _this = this;
         var rewrites1 = <div>{function () { return _this; }}</div>;
-        var rewrites2 = <div>{__spreadArrays([p], p, [p])}</div>;
+        var rewrites2 = <div>{__spreadArray(__spreadArray([p], p), [p])}</div>;
         var rewrites3 = <div>{{ p: p }}</div>;
         var rewrites4 = <div a={function () { return _this; }}></div>;
-        var rewrites5 = <div a={__spreadArrays([p], p, [p])}></div>;
+        var rewrites5 = <div a={__spreadArray(__spreadArray([p], p), [p])}></div>;
         var rewrites6 = <div a={{ p: p }}></div>;
     };
     return SomeClass;

tests/baselines/reference/tsxReactEmit1.js

@@ -42,12 +42,10 @@ var whitespace3 = <div>
 
 
 //// [file.js]
-var __spreadArrays = (this && this.__spreadArrays) || function () {
-    for (var s = 0, i = 0, il = arguments.length; i < il; i++) s += arguments[i].length;
-    for (var r = Array(s), k = 0, i = 0; i < il; i++)
-        for (var a = arguments[i], j = 0, jl = a.length; j < jl; j++, k++)
-            r[k] = a[j];
-    return r;
+var __spreadArray = (this && this.__spreadArray) || function (to, from) {
+    for (var i = 0, il = from.length, j = to.length; i < il; i++, j++)
+        to[j] = from[i];
+    return to;
 };
 var p;
 var selfClosed1 = React.createElement("div", null);
@@ -68,10 +66,10 @@ var SomeClass = /** @class */ (function () {
     SomeClass.prototype.f = function () {
         var _this = this;
         var rewrites1 = React.createElement("div", null, function () { return _this; });
-        var rewrites2 = React.createElement("div", null, __spreadArrays([p], p, [p]));
+        var rewrites2 = React.createElement("div", null, __spreadArray(__spreadArray([p], p), [p]));
         var rewrites3 = React.createElement("div", null, { p: p });
         var rewrites4 = React.createElement("div", { a: function () { return _this; } });
-        var rewrites5 = React.createElement("div", { a: __spreadArrays([p], p, [p]) });
+        var rewrites5 = React.createElement("div", { a: __spreadArray(__spreadArray([p], p), [p]) });
         var rewrites6 = React.createElement("div", { a: { p: p } });
     };
     return SomeClass;

tests/baselines/reference/variadicTuples1.js

@@ -405,41 +405,39 @@ type U3 = [...[string, number], boolean];
 //// [variadicTuples1.js]
 "use strict";
 // Variadics in tuple types
-var __spreadArrays = (this && this.__spreadArrays) || function () {
-    for (var s = 0, i = 0, il = arguments.length; i < il; i++) s += arguments[i].length;
-    for (var r = Array(s), k = 0, i = 0; i < il; i++)
-        for (var a = arguments[i], j = 0, jl = a.length; j < jl; j++, k++)
-            r[k] = a[j];
-    return r;
+var __spreadArray = (this && this.__spreadArray) || function (to, from) {
+    for (var i = 0, il = from.length, j = to.length; i < il; i++, j++)
+        to[j] = from[i];
+    return to;
 };
 // Variadics in array literals
 function tup2(t, u) {
-    return __spreadArrays([1], t, [2], u, [3]);
+    return __spreadArray(__spreadArray(__spreadArray(__spreadArray([1], t), [2]), u), [3]);
 }
 var t2 = tup2(['hello'], [10, true]);
 function concat(t, u) {
-    return __spreadArrays(t, u);
+    return __spreadArray(__spreadArray([], t), u);
 }
 var tc1 = concat([], []);
 var tc2 = concat(['hello'], [42]);
 var tc3 = concat([1, 2, 3], sa);
 var tc4 = concat(sa, [1, 2, 3]); // Ideally would be [...string[], number, number, number]
 function concat2(t, u) {
-    return __spreadArrays(t, u); // (T[number] | U[number])[]
+    return __spreadArray(__spreadArray([], t), u); // (T[number] | U[number])[]
 }
 var tc5 = concat2([1, 2, 3], [4, 5, 6]); // (1 | 2 | 3 | 4 | 5 | 6)[]
 function foo2(t1, t2, a1) {
     foo1(1, 'abc', true, 42, 43, 44);
-    foo1.apply(void 0, __spreadArrays(t1, [true, 42, 43, 44]));
-    foo1.apply(void 0, __spreadArrays(t1, t2, [42, 43, 44]));
-    foo1.apply(void 0, __spreadArrays(t1, t2, a1));
+    foo1.apply(void 0, __spreadArray(__spreadArray([], t1), [true, 42, 43, 44]));
+    foo1.apply(void 0, __spreadArray(__spreadArray(__spreadArray([], t1), t2), [42, 43, 44]));
+    foo1.apply(void 0, __spreadArray(__spreadArray(__spreadArray([], t1), t2), a1));
     foo1.apply(void 0, t1); // Error
-    foo1.apply(void 0, __spreadArrays(t1, [45])); // Error
+    foo1.apply(void 0, __spreadArray(__spreadArray([], t1), [45])); // Error
 }
 function foo4(u) {
     foo3(1, 2);
     foo3(1, 'hello', true, 2);
-    foo3.apply(void 0, __spreadArrays([1], u, ['hi', 2]));
+    foo3.apply(void 0, __spreadArray(__spreadArray([1], u), ['hi', 2]));
     foo3(1);
 }
 ft1(['hello', 42]); // (string | number)[]
@@ -473,17 +471,17 @@ function f3(t) {
 var tm1 = fm1([['abc'], [42], [true], ['def']]); // [boolean, string]
 function gx1(u, v) {
     fx1('abc'); // []
-    fx1.apply(void 0, __spreadArrays(['abc'], u)); // U
-    fx1.apply(void 0, __spreadArrays(['abc'], v)); // [...V]
-    fx1.apply(void 0, __spreadArrays(['abc'], u)); // U
-    fx1.apply(void 0, __spreadArrays(['abc'], v)); // Error
+    fx1.apply(void 0, __spreadArray(['abc'], u)); // U
+    fx1.apply(void 0, __spreadArray(['abc'], v)); // [...V]
+    fx1.apply(void 0, __spreadArray(['abc'], u)); // U
+    fx1.apply(void 0, __spreadArray(['abc'], v)); // Error
 }
 function gx2(u, v) {
     fx2('abc'); // []
-    fx2.apply(void 0, __spreadArrays(['abc'], u)); // U
-    fx2.apply(void 0, __spreadArrays(['abc'], v)); // [...V]
-    fx2.apply(void 0, __spreadArrays(['abc'], u)); // U
-    fx2.apply(void 0, __spreadArrays(['abc'], v)); // V
+    fx2.apply(void 0, __spreadArray(['abc'], u)); // U
+    fx2.apply(void 0, __spreadArray(['abc'], v)); // [...V]
+    fx2.apply(void 0, __spreadArray(['abc'], u)); // U
+    fx2.apply(void 0, __spreadArray(['abc'], v)); // V
 }
 // Relations involving variadic tuple types
 function f10(x, y, z) {
@@ -550,7 +548,7 @@ function curry(f) {
         for (var _i = 0; _i < arguments.length; _i++) {
             b[_i] = arguments[_i];
         }
-        return f.apply(void 0, __spreadArrays(a, b));
+        return f.apply(void 0, __spreadArray(__spreadArray([], a), b));
     };
 }
 var fn1 = function (a, b, c, d) { return 0; };
@@ -579,10 +577,10 @@ var fn3 = function () {
 };
 var c20 = curry(fn3); // (...args: string[]) => number
 var c21 = curry(fn3, 'abc', 'def'); // (...args: string[]) => number
-var c22 = curry.apply(void 0, __spreadArrays([fn3], sa)); // (...args: string[]) => number
+var c22 = curry.apply(void 0, __spreadArray([fn3], sa)); // (...args: string[]) => number
 // No inference to [...T, ...U] when there is no implied arity
 function curry2(f, t, u) {
-    return f.apply(void 0, __spreadArrays(t, u));
+    return f.apply(void 0, __spreadArray(__spreadArray([], t), u));
 }
 curry2(fn10, ['hello', 42], [true]);
 curry2(fn10, ['hello'], [42, true]);
@@ -591,7 +589,7 @@ ft([1, 2], [1, 2, 3]);
 ft(['a', 'b'], ['c', 'd']);
 ft(['a', 'b'], ['c', 'd', 42]);
 call('hello', 32, function (a, b) { return 42; });
-call.apply(void 0, __spreadArrays(sa, [function () {
+call.apply(void 0, __spreadArray(__spreadArray([], sa), [function () {
         var x = [];
         for (var _i = 0; _i < arguments.length; _i++) {
             x[_i] = arguments[_i];
@@ -615,7 +613,7 @@ function callApi(method) {
         for (var _i = 0; _i < arguments.length; _i++) {
             args[_i] = arguments[_i];
         }
-        return method.apply(void 0, __spreadArrays(args, [{}]));
+        return method.apply(void 0, __spreadArray(__spreadArray([], args), [{}]));
     };
 }
 callApi(getUser);

tests/baselines/reference/variadicTuples2.js

@@ -134,12 +134,10 @@ const e1 = foo('blah1', 'blah2', 1, 2, 3);  // Error
 //// [variadicTuples2.js]
 "use strict";
 // Declarations
-var __spreadArrays = (this && this.__spreadArrays) || function () {
-    for (var s = 0, i = 0, il = arguments.length; i < il; i++) s += arguments[i].length;
-    for (var r = Array(s), k = 0, i = 0; i < il; i++)
-        for (var a = arguments[i], j = 0, jl = a.length; j < jl; j++, k++)
-            r[k] = a[j];
-    return r;
+var __spreadArray = (this && this.__spreadArray) || function (to, from) {
+    for (var i = 0, il = from.length, j = to.length; i < il; i++, j++)
+        to[j] = from[i];
+    return to;
 };
 tt1 = [5];
 tt1 = ['abc', 5];
@@ -193,14 +191,14 @@ pipe("foo", 123, true, function () {
     }
     x; // [string, number, boolean]
 });
-pipe.apply(void 0, __spreadArrays(sa, [function () {
+pipe.apply(void 0, __spreadArray(__spreadArray([], sa), [function () {
         var x = [];
         for (var _i = 0; _i < arguments.length; _i++) {
             x[_i] = arguments[_i];
         }
         x; // string[]
     }]));
-pipe.apply(void 0, __spreadArrays([1], sa, [2, function () {
+pipe.apply(void 0, __spreadArray(__spreadArray([1], sa), [2, function () {
         var x = [];
         for (var _i = 0; _i < arguments.length; _i++) {
             x[_i] = arguments[_i];