Fix rwc (#7895)

* Fix RWC

* Fix RWC

* Addres PR

src/compiler/program.ts

@@ -44,15 +44,6 @@ namespace ts {
         return compilerOptions.traceModuleResolution && host.trace !== undefined;
     }
 
-    function startsWith(str: string, prefix: string): boolean {
-        return str.lastIndexOf(prefix, 0) === 0;
-    }
-
-    function endsWith(str: string, suffix: string): boolean {
-        const expectedPos = str.length - suffix.length;
-        return str.indexOf(suffix, expectedPos) === expectedPos;
-    }
-
     function hasZeroOrOneAsteriskCharacter(str: string): boolean {
         let seenAsterisk = false;
         for (let i = 0; i < str.length; i++) {

src/compiler/utilities.ts

@@ -2927,4 +2927,13 @@ namespace ts {
     export function isParameterPropertyDeclaration(node: ParameterDeclaration): boolean {
         return node.flags & NodeFlags.AccessibilityModifier && node.parent.kind === SyntaxKind.Constructor && isClassLike(node.parent.parent);
     }
+
+    export function startsWith(str: string, prefix: string): boolean {
+        return str.lastIndexOf(prefix, 0) === 0;
+    }
+
+    export function endsWith(str: string, suffix: string): boolean {
+        const expectedPos = str.length - suffix.length;
+        return str.indexOf(suffix, expectedPos) === expectedPos;
+    }
 }

src/harness/fourslash.ts

@@ -221,7 +221,7 @@ namespace FourSlash {
 
             function tryAdd(path: string) {
                 const inputFile = inputFiles[path];
-                if (inputFile && !Harness.isLibraryFile(path)) {
+                if (inputFile && !Harness.isDefaultLibraryFile(path)) {
                     languageServiceAdapterHost.addScript(path, inputFile);
                     return true;
                 }
@@ -298,7 +298,7 @@ namespace FourSlash {
             else {
                 // resolveReference file-option is not specified then do not resolve any files and include all inputFiles
                 ts.forEachKey(this.inputFiles, fileName => {
-                    if (!Harness.isLibraryFile(fileName)) {
+                    if (!Harness.isDefaultLibraryFile(fileName)) {
                         this.languageServiceAdapterHost.addScript(fileName, this.inputFiles[fileName]);
                     }
                 });

src/harness/harness.ts

@@ -816,8 +816,7 @@ namespace Harness {
         };
 
         export function getDefaultLibrarySourceFile(fileName = defaultLibFileName): ts.SourceFile {
-            if (!isLibraryFile(fileName)) {
-                assert(!isLibraryFile(fileName), "Expected library fileName");
+            if (!isDefaultLibraryFile(fileName)) {
                 return undefined;
             }
 
@@ -1157,7 +1156,7 @@ namespace Harness {
                 // then they will be added twice thus triggering 'total errors' assertion with condition
                 // 'totalErrorsReportedInNonLibraryFiles + numLibraryDiagnostics + numTest262HarnessDiagnostics, diagnostics.length
 
-                if (!error.file || !isLibraryFile(error.file.fileName)) {
+                if (!error.file || !isDefaultLibraryFile(error.file.fileName)) {
                     totalErrorsReportedInNonLibraryFiles++;
                 }
             }
@@ -1236,7 +1235,7 @@ namespace Harness {
             });
 
             const numLibraryDiagnostics = ts.countWhere(diagnostics, diagnostic => {
-                return diagnostic.file && (isLibraryFile(diagnostic.file.fileName) || isBuiltFile(diagnostic.file.fileName));
+                return diagnostic.file && (isDefaultLibraryFile(diagnostic.file.fileName) || isBuiltFile(diagnostic.file.fileName));
             });
 
             const numTest262HarnessDiagnostics = ts.countWhere(diagnostics, diagnostic => {
@@ -1623,10 +1622,10 @@ namespace Harness {
         }
     }
 
-    // Regex for check if the give filePath is a library file
-    const libRegex = /lib(\.\S+)*\.d\.ts/;
-    export function isLibraryFile(filePath: string): boolean {
-        return !!libRegex.exec(Path.getFileName(filePath));
+    export function isDefaultLibraryFile(filePath: string): boolean {
+        // We need to make sure that the filePath is prefixed with "lib." not just containing "lib." and end with ".d.ts"
+        const fileName = Path.getFileName(filePath);
+        return ts.startsWith(fileName, "lib.") && ts.endsWith(fileName, ".d.ts");
     }
 
     export function isBuiltFile(filePath: string): boolean {

src/harness/projectsRunner.ts

@@ -412,7 +412,7 @@ class ProjectRunner extends RunnerBase {
 
         function getErrorsBaseline(compilerResult: CompileProjectFilesResult) {
             const inputFiles = compilerResult.program ? ts.map(ts.filter(compilerResult.program.getSourceFiles(),
-                sourceFile => !Harness.isLibraryFile(sourceFile.fileName)),
+                sourceFile => !Harness.isDefaultLibraryFile(sourceFile.fileName)),
                 sourceFile => {
                     return {
                         unitName: ts.isRootedDiskPath(sourceFile.fileName) ?

src/harness/rwcRunner.ts

@@ -95,13 +95,13 @@ namespace RWC {
                             continue;
                         }
 
-                        if (!Harness.isLibraryFile(fileRead.path)) {
+                        if (!Harness.isDefaultLibraryFile(fileRead.path)) {
                             if (inInputList) {
                                 continue;
                             }
                             otherFiles.push(getHarnessCompilerInputUnit(fileRead.path));
                         }
-                        else if (!opts.options.noLib && Harness.isLibraryFile(fileRead.path)) {
+                        else if (!opts.options.noLib && Harness.isDefaultLibraryFile(fileRead.path)) {
                             if (!inInputList) {
                                 // If useCustomLibraryFile is true, we will use lib.d.ts from json object
                                 // otherwise use the lib.d.ts from built/local