Allow declarationMap to be emitted when transpiling declarations and option is enabled (#59337)

src/compiler/builderState.ts

@@ -5,6 +5,7 @@ import {
     computeSignatureWithDiagnostics,
     CustomTransformers,
     Debug,
+    EmitOnly,
     EmitOutput,
     emptyArray,
     GetCanonicalFileName,
@@ -418,7 +419,7 @@ export namespace BuilderState {
                 );
             },
             cancellationToken,
-            /*emitOnly*/ true,
+            EmitOnly.BuilderSignature,
             /*customTransformers*/ undefined,
             /*forceDtsEmit*/ true,
         );

src/compiler/commandLineParser.ts

@@ -467,7 +467,6 @@ export const commonOptionsWithBuild: CommandLineOption[] = [
         affectsBuildInfo: true,
         showInSimplifiedHelpView: true,
         category: Diagnostics.Emit,
-        transpileOptionValue: undefined,
         defaultValueDescription: false,
         description: Diagnostics.Create_sourcemaps_for_d_ts_files,
     },

src/compiler/emitter.ts

@@ -907,7 +907,7 @@ export function emitFiles(
                 module: compilerOptions.module,
                 moduleResolution: compilerOptions.moduleResolution,
                 target: compilerOptions.target,
-                sourceMap: !forceDtsEmit && compilerOptions.declarationMap,
+                sourceMap: emitOnly !== EmitOnly.BuilderSignature && compilerOptions.declarationMap,
                 inlineSourceMap: compilerOptions.inlineSourceMap,
                 extendedDiagnostics: compilerOptions.extendedDiagnostics,
                 onlyPrintJsDocStyle: true,

src/compiler/types.ts

@@ -4648,6 +4648,7 @@ export type FilePreprocessingDiagnostics = FilePreprocessingLibReferenceDiagnost
 export const enum EmitOnly {
     Js,
     Dts,
+    BuilderSignature,
 }
 
 /** @internal */

src/testRunner/transpileRunner.ts

@@ -48,7 +48,11 @@ enum TranspileKind {
 }
 
 class TranspileTestCase {
-    static varyBy = [];
+    static varyBy = [
+        "declarationMap",
+        "sourceMap",
+        "inlineSourceMap",
+    ];
 
     static getConfigurations(file: string): TranspileTestCase[] {
         const ext = vpath.extname(file);
@@ -104,6 +108,13 @@ class TranspileTestCase {
                 if (!result.outputText.endsWith("\n")) {
                     baselineText += "\r\n";
                 }
+                if (result.sourceMapText) {
+                    baselineText += `//// [${ts.changeExtension(unit.name, kind === TranspileKind.Module ? this.getJsOutputExtension(unit.name) : ts.getDeclarationEmitExtensionForPath(unit.name))}.map] ////\r\n`;
+                    baselineText += result.sourceMapText;
+                    if (!result.outputText.endsWith("\n")) {
+                        baselineText += "\r\n";
+                    }
+                }
                 if (result.diagnostics && result.diagnostics.length) {
                     baselineText += "\r\n\r\n//// [Diagnostics reported]\r\n";
                     baselineText += Compiler.getErrorBaseline([{ content: unit.content, unitName: unit.name }], result.diagnostics, !!opts.pretty);