Do not query for bind errors if skipLibCheck or skipDefaultLibCheck is set

Author: mhegazy

src/compiler/program.ts

@@ -908,6 +908,13 @@ namespace ts {
 
         function getSemanticDiagnosticsForFileNoCache(sourceFile: SourceFile, cancellationToken: CancellationToken): Diagnostic[] {
             return runWithCancellationToken(() => {
+                // If skipLibCheck is enabled, skip reporting errors if file is a declaration file.
+                // If skipDefaultLibCheck is enabled, skip reporting errors if file contains a
+                // '/// <reference no-default-lib="true"/>' directive.
+                if (options.skipLibCheck && sourceFile.isDeclarationFile || options.skipDefaultLibCheck && sourceFile.hasNoDefaultLib) {
+                    return emptyArray;
+                }
+
                 const typeChecker = getDiagnosticsProducingTypeChecker();
 
                 Debug.assert(!!sourceFile.bindDiagnostics);

tests/cases/compiler/noDefaultLib.ts

@@ -1,3 +1,4 @@
+// @skipDefaultLibCheck: false
 /// <reference no-default-lib="true"/>
 var x;
 

tests/cases/compiler/variableDeclarationInStrictMode1.ts

@@ -1,2 +1,3 @@
+// @skipDefaultLibCheck: false
 "use strict";
 var eval;