Add noCheck API option (#57934)

src/compiler/checker.ts

@@ -8797,6 +8797,7 @@ export function createTypeChecker(host: TypeCheckerHost): TypeChecker {
             }
 
             function serializeSymbol(symbol: Symbol, isPrivate: boolean, propertyAsAlias: boolean): void {
+                void getPropertiesOfType(getTypeOfSymbol(symbol)); // resolve symbol's type and properties, which should trigger any required merges
                 // cache visited list based on merged symbol, since we want to use the unmerged top-level symbol, but
                 // still skip reserializing it if we encounter the merged product later on
                 const visitedSym = getMergedSymbol(symbol);
@@ -48893,6 +48894,7 @@ export function createTypeChecker(host: TypeCheckerHost): TypeChecker {
                 if (!sym) {
                     return !node.locals ? [] : nodeBuilder.symbolTableToDeclarationStatements(node.locals, node, flags, tracker);
                 }
+                resolveExternalModuleSymbol(sym); // ensures cjs export assignment is setup
                 return !sym.exports ? [] : nodeBuilder.symbolTableToDeclarationStatements(sym.exports, node, flags, tracker);
             },
             isImportRequiredByAugmentation,

src/compiler/commandLineParser.ts

@@ -772,6 +772,20 @@ const commandOptionsWithoutBuild: CommandLineOption[] = [
         defaultValueDescription: false,
         description: Diagnostics.Disable_emitting_comments,
     },
+    {
+        name: "noCheck",
+        type: "boolean",
+        showInSimplifiedHelpView: false,
+        category: Diagnostics.Compiler_Diagnostics,
+        description: Diagnostics.Disable_full_type_checking_only_critical_parse_and_emit_errors_will_be_reported,
+        transpileOptionValue: undefined,
+        defaultValueDescription: false,
+        affectsSemanticDiagnostics: true,
+        affectsBuildInfo: true,
+        extraValidation() {
+            return [Diagnostics.Unknown_compiler_option_0, "noCheck"];
+        },
+    },
     {
         name: "noEmit",
         type: "boolean",

src/compiler/diagnosticMessages.json

@@ -6388,6 +6388,10 @@
         "category": "Message",
         "code": 6804
     },
+    "Disable full type checking (only critical parse and emit errors will be reported).": {
+        "category": "Message",
+        "code": 6805
+    },
 
     "one of:": {
         "category": "Message",

src/compiler/emitter.ts

@@ -848,8 +848,8 @@ export function emitFiles(resolver: EmitResolver, host: EmitHost, targetSourceFi
         const filesForEmit = forceDtsEmit ? sourceFiles : filter(sourceFiles, isSourceFileNotJson);
         // Setup and perform the transformation to retrieve declarations from the input files
         const inputListOrBundle = compilerOptions.outFile ? [factory.createBundle(filesForEmit)] : filesForEmit;
-        if (emitOnly && !getEmitDeclarations(compilerOptions)) {
-            // Checker wont collect the linked aliases since thats only done when declaration is enabled.
+        if ((emitOnly && !getEmitDeclarations(compilerOptions)) || compilerOptions.noCheck) {
+            // Checker wont collect the linked aliases since thats only done when declaration is enabled and checking is performed.
             // Do that here when emitting only dts files
             filesForEmit.forEach(collectLinkedAliases);
         }

src/compiler/program.ts

@@ -4425,6 +4425,15 @@ export function createProgram(rootNamesOrOptions: readonly string[] | CreateProg
             }
         }
 
+        if (options.noCheck) {
+            if (options.noEmit) {
+                createDiagnosticForOptionName(Diagnostics.Option_0_cannot_be_specified_with_option_1, "noCheck", "noEmit");
+            }
+            if (!options.emitDeclarationOnly) {
+                createDiagnosticForOptionName(Diagnostics.Option_0_cannot_be_specified_without_specifying_option_1, "noCheck", "emitDeclarationOnly");
+            }
+        }
+
         if (
             options.emitDecoratorMetadata &&
             !options.experimentalDecorators

src/compiler/types.ts

@@ -7270,6 +7270,7 @@ export interface CompilerOptions {
     moduleDetection?: ModuleDetectionKind;
     newLine?: NewLineKind;
     noEmit?: boolean;
+    /** @internal */ noCheck?: boolean;
     /** @internal */ noEmitForJsFiles?: boolean;
     noEmitHelpers?: boolean;
     noEmitOnError?: boolean;

src/compiler/utilities.ts

@@ -9967,6 +9967,7 @@ export function skipTypeChecking(sourceFile: SourceFile, options: CompilerOption
     // '/// <reference no-default-lib="true"/>' directive.
     return (options.skipLibCheck && sourceFile.isDeclarationFile ||
         options.skipDefaultLibCheck && sourceFile.hasNoDefaultLib) ||
+        options.noCheck ||
         host.isSourceOfProjectReferenceRedirect(sourceFile.fileName);
 }