Make old behavior toggleable, disable outside testing for continued perf comparisons

Herebyfile.mjs

@@ -175,6 +175,7 @@ async function runDtsBundler(entrypoint, output) {
  * @property {boolean} [exportIsTsObject]
  * @property {boolean} [treeShaking]
  * @property {boolean} [usePublicAPI]
+ * @property {boolean} [tsgoCompat]
  * @property {() => void} [onWatchRebuild]
  */
 function createBundler(entrypoint, outfile, taskOptions = {}) {
@@ -196,6 +197,9 @@ function createBundler(entrypoint, outfile, taskOptions = {}) {
             treeShaking: taskOptions.treeShaking,
             packages: "external",
             logLevel: "warning",
+            define: {
+                __TSGO_COMPAT__: taskOptions.tsgoCompat ? "true" : "false",
+            },
             // legalComments: "none", // If we add copyright headers to the source files, uncomment.
         };
 
@@ -232,7 +236,8 @@ function createBundler(entrypoint, outfile, taskOptions = {}) {
             const require = "require";
             const fakeName = "Q".repeat(require.length);
             const fakeNameRegExp = new RegExp(fakeName, "g");
-            options.define = { [require]: fakeName };
+            options.define ||= {};
+            options.define[require] = fakeName;
 
             // For historical reasons, TypeScript does not set __esModule. Hack esbuild's __toCommonJS to be a noop.
             // We reference `__copyProps` to ensure the final bundle doesn't have any unreferenced code.
@@ -541,6 +546,7 @@ const { main: tests, watch: watchTests } = entrypointBuildTask({
     output: testRunner,
     mainDeps: [generateLibs],
     bundlerOptions: {
+        tsgoCompat: true,
         // Ensure we never drop any dead code, which might be helpful while debugging.
         treeShaking: false,
         onWatchRebuild() {

src/compiler/checker.ts

@@ -84,6 +84,7 @@ import {
     compareComparableValues,
     compareDiagnostics,
     comparePaths,
+    compareValues,
     Comparison,
     CompilerOptions,
     ComputedPropertyName,
@@ -5394,7 +5395,7 @@ export function createTypeChecker(host: TypeCheckerHost): TypeChecker {
     }
 
     function createTypeofType() {
-        return getUnionType(map([...typeofNEFacts.keys()].sort(), getStringLiteralType));
+        return getUnionType(map(__TSGO_COMPAT__ ? [...typeofNEFacts.keys()].sort() : arrayFrom(typeofNEFacts.keys()), getStringLiteralType));
     }
 
     function createTypeParameter(symbol?: Symbol) {
@@ -5420,7 +5421,7 @@ export function createTypeChecker(host: TypeCheckerHost): TypeChecker {
                 (result || (result = [])).push(symbol);
             }
         });
-        result?.sort(compareSymbols);
+        sortSymbolsIfTSGoCompat(result);
         return result || emptyArray;
     }
 
@@ -17653,11 +17654,11 @@ export function createTypeChecker(host: TypeCheckerHost): TypeChecker {
     }
 
     function containsType(types: readonly Type[], type: Type): boolean {
-        return binarySearch(types, type, identity, compareTypes) >= 0;
+        return __TSGO_COMPAT__ ? binarySearch(types, type, identity, compareTypes) >= 0 : binarySearch(types, type, getTypeId, compareValues) >= 0;
     }
 
     function insertType(types: Type[], type: Type): boolean {
-        const index = binarySearch(types, type, identity, compareTypes);
+        const index = __TSGO_COMPAT__ ? binarySearch(types, type, identity, compareTypes) : binarySearch(types, type, getTypeId, compareValues);
         if (index < 0) {
             types.splice(~index, 0, type);
             return true;
@@ -17678,7 +17679,8 @@ export function createTypeChecker(host: TypeCheckerHost): TypeChecker {
                 if (!(getObjectFlags(type) & ObjectFlags.ContainsWideningType)) includes |= TypeFlags.IncludesNonWideningType;
             }
             else {
-                const index = binarySearch(typeSet, type, identity, compareTypes);
+                const len = typeSet.length;
+                const index = __TSGO_COMPAT__ ? binarySearch(typeSet, type, identity, compareTypes) : (len && type.id > typeSet[len - 1].id ? ~len : binarySearch(typeSet, type, getTypeId, compareValues));
                 if (index < 0) {
                     typeSet.splice(~index, 0, type);
                 }
@@ -34717,7 +34719,7 @@ export function createTypeChecker(host: TypeCheckerHost): TypeChecker {
         // So the table *contains* `x` but `x` isn't actually in scope.
         // However, resolveNameHelper will continue and call this callback again, so we'll eventually get a correct suggestion.
         if (symbol) return symbol;
-        let candidates = arrayFrom(symbols.values()).sort(compareSymbols);
+        let candidates = arrayFrom(symbols.values());
         if (symbols === globals) {
             const primitives = mapDefined(
                 ["string", "number", "boolean", "object", "bigint", "symbol"],
@@ -34725,8 +34727,9 @@ export function createTypeChecker(host: TypeCheckerHost): TypeChecker {
                     ? createSymbol(SymbolFlags.TypeAlias, s as __String) as Symbol
                     : undefined,
             );
-            candidates = concatenate(candidates, primitives);
+            candidates = concatenate(primitives, candidates);
         }
+        sortSymbolsIfTSGoCompat(candidates);
         return getSpellingSuggestionForName(unescapeLeadingUnderscores(name), candidates, meaning);
     }
     function getSuggestedSymbolForNonexistentSymbol(location: Node | undefined, outerName: __String, meaning: SymbolFlags): Symbol | undefined {
@@ -34736,7 +34739,7 @@ export function createTypeChecker(host: TypeCheckerHost): TypeChecker {
     }
 
     function getSuggestedSymbolForNonexistentModule(name: Identifier, targetModule: Symbol): Symbol | undefined {
-        return targetModule.exports && getSpellingSuggestionForName(idText(name), getExportsOfModuleAsArray(targetModule).sort(compareSymbols), SymbolFlags.ModuleMember); // eslint-disable-line local/no-array-mutating-method-expressions
+        return targetModule.exports && getSpellingSuggestionForName(idText(name), sortSymbolsIfTSGoCompat(getExportsOfModuleAsArray(targetModule)), SymbolFlags.ModuleMember);
     }
 
     function getSuggestionForNonexistentIndexSignature(objectType: Type, expr: ElementAccessExpression, keyedType: Type): string | undefined {
@@ -52850,6 +52853,15 @@ export function createTypeChecker(host: TypeCheckerHost): TypeChecker {
         return specifier;
     }
 
+    function sortSymbolsIfTSGoCompat(array: Symbol[]): Symbol[];
+    function sortSymbolsIfTSGoCompat(array: Symbol[] | undefined): Symbol[] | undefined;
+    function sortSymbolsIfTSGoCompat(array: Symbol[] | undefined): Symbol[] | undefined {
+        if (__TSGO_COMPAT__ && array) {
+            return array.sort(compareSymbols);
+        }
+        return array;
+    }
+
     function compareSymbols(s1: Symbol | undefined, s2: Symbol | undefined): number {
         if (s1 === s2) return 0;
         if (s1 === undefined) return 1;

src/compiler/corePublic.ts

@@ -5,6 +5,12 @@ export const versionMajorMinor = "5.7";
 /** The version of the TypeScript compiler release */
 export const version: string = `${versionMajorMinor}.0-dev`;
 
+declare global {
+    var __TSGO_COMPAT__: boolean | undefined;
+}
+
+globalThis.__TSGO_COMPAT__ ??= false;
+
 /**
  * Type of objects whose values are all of the same type.
  * The `in` and `for-in` operators can *not* be safely used,