Keep comments in production tsserverlibrary builds (#18913)

Author: weswigham

Gulpfile.ts

@@ -505,7 +505,7 @@ const tsserverLibraryFile = path.join(builtLocalDirectory, "tsserverlibrary.js")
 const tsserverLibraryDefinitionFile = path.join(builtLocalDirectory, "tsserverlibrary.d.ts");
 
 gulp.task(tsserverLibraryFile, /*help*/ false, [servicesFile, typesMapJson], (done) => {
-    const serverLibraryProject = tsc.createProject("src/server/tsconfig.library.json", getCompilerSettings({}, /*useBuiltCompiler*/ true));
+    const serverLibraryProject = tsc.createProject("src/server/tsconfig.library.json", getCompilerSettings({ removeComments: false }, /*useBuiltCompiler*/ true));
     const {js, dts}: { js: NodeJS.ReadableStream, dts: NodeJS.ReadableStream } = serverLibraryProject.src()
         .pipe(sourcemaps.init())
         .pipe(newer(tsserverLibraryFile))

Jakefile.js

@@ -647,7 +647,7 @@ compileFile(
     [builtLocalDirectory, copyright, builtLocalCompiler].concat(languageServiceLibrarySources).concat(libraryTargets),
     /*prefixes*/[copyright],
     /*useBuiltCompiler*/ true,
-    { noOutFile: false, generateDeclarations: true, stripInternal: true, preserveConstEnums: true },
+    { noOutFile: false, generateDeclarations: true, stripInternal: true, preserveConstEnums: true, keepComments: true },
     /*callback*/ function () {
         prependFile(copyright, tsserverLibraryDefinitionFile);