implemented treat warning as errors commandline option.

src/compiler/checker.ts

@@ -109,7 +109,7 @@ module ts {
             getAliasedSymbol: resolveImport,
             isUndefinedSymbol: symbol => symbol === undefinedSymbol,
             isArgumentsSymbol: symbol => symbol === argumentsSymbol,
-            hasEarlyErrors: hasEarlyErrors
+            isEmitBlocked: isEmitBlocked
         };
 
         var undefinedSymbol = createSymbol(SymbolFlags.Property | SymbolFlags.Transient, "undefined");
@@ -8984,6 +8984,12 @@ module ts {
             return getDiagnostics().length > 0 || getGlobalDiagnostics().length > 0;
         }
 
+        function isEmitBlocked(sourceFile?: SourceFile): boolean {
+            return program.getDiagnostics(sourceFile).length !== 0 ||
+                hasEarlyErrors(sourceFile) ||
+                (compilerOptions.noEmitOnError && getDiagnostics(sourceFile).length !== 0);
+        }
+
         function hasEarlyErrors(sourceFile?: SourceFile): boolean {
             return forEach(getDiagnostics(sourceFile), d => d.isEarly);
         }
@@ -9080,7 +9086,7 @@ module ts {
                 getEnumMemberValue: getEnumMemberValue,
                 isTopLevelValueImportWithEntityName: isTopLevelValueImportWithEntityName,
                 hasSemanticErrors: hasSemanticErrors,
-                hasEarlyErrors: hasEarlyErrors,
+                isEmitBlocked: isEmitBlocked,
                 isDeclarationVisible: isDeclarationVisible,
                 isImplementationOfOverload: isImplementationOfOverload,
                 writeTypeAtLocation: writeTypeAtLocation,

src/compiler/commandLineParser.ts

@@ -54,6 +54,11 @@ module ts {
             paramType: Diagnostics.KIND,
             error: Diagnostics.Argument_for_module_option_must_be_commonjs_or_amd
         },
+        {
+            name: "noEmitOnError",
+            type: "boolean",
+            description: Diagnostics.Do_not_emit_outputs_if_any_type_checking_errors_were_reported,
+        },
         {
             name: "noImplicitAny",
             type: "boolean",

src/compiler/diagnosticInformationMap.generated.ts

@@ -373,6 +373,7 @@ module ts {
         Watch_input_files: { code: 6005, category: DiagnosticCategory.Message, key: "Watch input files." },
         Redirect_output_structure_to_the_directory: { code: 6006, category: DiagnosticCategory.Message, key: "Redirect output structure to the directory." },
         Do_not_erase_const_enum_declarations_in_generated_code: { code: 6007, category: DiagnosticCategory.Message, key: "Do not erase const enum declarations in generated code." },
+        Do_not_emit_outputs_if_any_type_checking_errors_were_reported: { code: 6008, category: DiagnosticCategory.Message, key: "Do not emit outputs if any type checking errors were reported." },
         Do_not_emit_comments_to_output: { code: 6009, category: DiagnosticCategory.Message, key: "Do not emit comments to output." },
         Specify_ECMAScript_target_version_Colon_ES3_default_ES5_or_ES6_experimental: { code: 6015, category: DiagnosticCategory.Message, key: "Specify ECMAScript target version: 'ES3' (default), 'ES5', or 'ES6' (experimental)" },
         Specify_module_code_generation_Colon_commonjs_or_amd: { code: 6016, category: DiagnosticCategory.Message, key: "Specify module code generation: 'commonjs' or 'amd'" },

src/compiler/diagnosticMessages.json

@@ -1490,6 +1490,10 @@
         "category": "Message",
         "code": 6007
     },
+    "Do not emit outputs if any type checking errors were reported.": {
+        "category": "Message",
+        "code": 6008
+    },
     "Do not emit comments to output.": {
         "category": "Message",
         "code": 6009

src/compiler/emitter.ts

@@ -3463,10 +3463,10 @@ module ts {
         }
 
         var hasSemanticErrors = resolver.hasSemanticErrors();
-        var hasEarlyErrors = resolver.hasEarlyErrors(targetSourceFile);
+        var isEmitBlocked = resolver.isEmitBlocked(targetSourceFile);
 
         function emitFile(jsFilePath: string, sourceFile?: SourceFile) {
-            if (!hasEarlyErrors) {
+            if (!isEmitBlocked) {
                 emitJavaScript(jsFilePath, sourceFile);
                 if (!hasSemanticErrors && compilerOptions.declaration) {
                     emitDeclarations(jsFilePath, sourceFile);
@@ -3510,7 +3510,7 @@ module ts {
 
         // Check and update returnCode for syntactic and semantic
         var returnCode: EmitReturnStatus;
-        if (hasEarlyErrors) {
+        if (isEmitBlocked) {
             returnCode = EmitReturnStatus.AllOutputGenerationSkipped;
         } else if (hasEmitterError) {
             returnCode = EmitReturnStatus.EmitErrorsEncountered;

src/compiler/tsc.ts

@@ -362,17 +362,17 @@ module ts {
             var checker = program.getTypeChecker(/*fullTypeCheckMode*/ true);
             var checkStart = new Date().getTime();
             errors = checker.getDiagnostics();
-            if (!checker.hasEarlyErrors()) {
+            if (checker.isEmitBlocked()) {
+                exitStatus = EmitReturnStatus.AllOutputGenerationSkipped;
+            }
+            else {
                 var emitStart = new Date().getTime();
                 var emitOutput = checker.emitFiles();
                 var emitErrors = emitOutput.errors;
                 exitStatus = emitOutput.emitResultStatus;
                 var reportStart = new Date().getTime();
                 errors = concatenate(errors, emitErrors);
             }
-            else {
-                exitStatus = EmitReturnStatus.AllOutputGenerationSkipped;
-            }
         }
 
         reportDiagnostics(errors);

src/compiler/types.ts

@@ -731,8 +731,8 @@ module ts {
         getSignatureFromDeclaration(declaration: SignatureDeclaration): Signature;
         isImplementationOfOverload(node: FunctionLikeDeclaration): boolean;
         isUndefinedSymbol(symbol: Symbol): boolean;
-        isArgumentsSymbol(symbol: Symbol): boolean;
-        hasEarlyErrors(sourceFile?: SourceFile): boolean;
+        isArgumentsSymbol(symbol: Symbol): boolean;
+        isEmitBlocked(sourceFile?: SourceFile): boolean;
         // Returns the constant value of this enum member, or 'undefined' if the enum member has a computed value.
         getEnumMemberValue(node: EnumMember): number;
         isValidPropertyAccess(node: PropertyAccess, propertyName: string): boolean;
@@ -823,7 +823,7 @@ module ts {
         isImportDeclarationEntityNameReferenceDeclarationVisibile(entityName: EntityName): SymbolAccessiblityResult;
         // Returns the constant value this property access resolves to, or 'undefined' for a non-constant
         getConstantValue(node: PropertyAccess | IndexedAccess): number;
-        hasEarlyErrors(sourceFile?: SourceFile): boolean;
+        isEmitBlocked(sourceFile?: SourceFile): boolean;
     }
 
     export const enum SymbolFlags {
@@ -1156,6 +1156,7 @@ module ts {
         locale?: string;
         mapRoot?: string;
         module?: ModuleKind;
+        noEmitOnError?: boolean;
         noErrorTruncation?: boolean;
         noImplicitAny?: boolean;
         noLib?: boolean;

src/harness/compilerRunner.ts

@@ -175,7 +175,12 @@ class CompilerBaselineRunner extends RunnerBase {
             it('Correct sourcemap content for ' + fileName, () => {
                 if (options.sourceMap) {
                     Harness.Baseline.runBaseline('Correct sourcemap content for ' + fileName, justName.replace(/\.ts$/, '.sourcemap.txt'), () => {
-                        return result.getSourceMapRecord();
+                        var record = result.getSourceMapRecord();
+                        if (options.noEmitOnError && result.errors.length !== 0 && record === undefined) {
+                            // Because of the noEmitOnError option no files are created. We need to return null because baselining isn't required.
+                            return null;
+                        }
+                        return record;
                     });
                 }
             });
@@ -246,6 +251,12 @@ class CompilerBaselineRunner extends RunnerBase {
                     }
 
                     Harness.Baseline.runBaseline('Correct Sourcemap output for ' + fileName, justName.replace(/\.ts/, '.js.map'), () => {
+                        if (options.noEmitOnError && result.errors.length !== 0 && result.sourceMaps.length === 0) {
+                            // We need to return null here or the runBaseLine will actually create a empty file.
+                            // Baselining isn't required here because there is no output.
+                            return null;
+                        }
+
                         var sourceMapCode = '';
                         for (var i = 0; i < result.sourceMaps.length; i++) {
                             sourceMapCode += '//// [' + Harness.Path.getFileName(result.sourceMaps[i].fileName) + ']\r\n';

src/harness/harness.ts

@@ -700,6 +700,10 @@ module Harness {
                             }
                             break;
 
+                        case 'noemitonerror':
+                            options.noEmitOnError = !!setting.value;
+                            break;
+
                         case 'noresolve':
                             options.noResolve = !!setting.value;
                             break;
@@ -794,16 +798,14 @@ module Harness {
                     options.target,
                     useCaseSensitiveFileNames));
 
-                var hadParseErrors = program.getDiagnostics().length > 0;
-
                 var checker = program.getTypeChecker(/*fullTypeCheckMode*/ true);
                 checker.checkProgram();
 
-                var hasEarlyErrors = checker.hasEarlyErrors();
+                var isEmitBlocked = checker.isEmitBlocked();
 
                 // only emit if there weren't parse errors
                 var emitResult: ts.EmitResult;
-                if (!hadParseErrors && !hasEarlyErrors) {
+                if (!isEmitBlocked) {
                     emitResult = checker.emitFiles();
                 }
 
@@ -1148,7 +1150,7 @@ module Harness {
         var optionRegex = /^[\/]{2}\s*@(\w+)\s*:\s*(\S*)/gm;  // multiple matches on multiple lines
 
         // List of allowed metadata names
-        var fileMetadataNames = ["filename", "comments", "declaration", "module", "nolib", "sourcemap", "target", "out", "outdir", "noimplicitany", "noresolve", "newline", "newlines", "emitbom", "errortruncation", "usecasesensitivefilenames", "preserveconstenums"];
+        var fileMetadataNames = ["filename", "comments", "declaration", "module", "nolib", "sourcemap", "target", "out", "outdir", "noemitonerror","noimplicitany", "noresolve", "newline", "newlines", "emitbom", "errortruncation", "usecasesensitivefilenames", "preserveconstenums"];
 
         function extractCompilerSettings(content: string): CompilerSetting[] {
 

tests/baselines/reference/noEmitOnError.errors.txt

@@ -0,0 +1,9 @@
+tests/cases/compiler/noEmitOnError.ts(2,5): error TS2322: Type 'string' is not assignable to type 'number'.
+
+
+==== tests/cases/compiler/noEmitOnError.ts (1 errors) ====
+
+    var x: number = "";
+        ~
+!!! error TS2322: Type 'string' is not assignable to type 'number'.
+

tests/cases/compiler/noEmitOnError.ts

@@ -0,0 +1,5 @@
+// @noemitonerror: true
+// @sourcemap: true
+// @declaration: true
+
+var x: number = "";