implemented treat warning as errors commandline option (warnaserror).

Author: DickvdBrink

Diff for: src/compiler/commandLineParser.ts

@@ -113,6 +113,11 @@ module ts {
             type: "boolean",
             description: Diagnostics.Print_the_compiler_s_version,
         },
+        {
+            name: "warnAsError",
+            type: "boolean",
+            description: Diagnostics.Report_all_warnings_as_errors,
+        },
         {
             name: "watch",
             shortName: "w",

Diff for: src/compiler/diagnosticInformationMap.generated.ts

@@ -364,6 +364,7 @@ module ts {
         Specifies_the_location_where_debugger_should_locate_TypeScript_files_instead_of_source_locations: { code: 6004, category: DiagnosticCategory.Message, key: "Specifies the location where debugger should locate TypeScript files instead of source locations." },
         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." },
+        Report_all_warnings_as_errors: { code: 6007, category: DiagnosticCategory.Message, key: "Report all warnings as errors." },
         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'" },

Diff for: src/compiler/diagnosticMessages.json

@@ -1456,6 +1456,10 @@
         "category": "Message",
         "code": 6006
     },
+    "Report all warnings as errors.": {
+        "category": "Message",
+        "code": 6007
+    },
     "Do not emit comments to output.": {
         "category": "Message",
         "code": 6009

Diff for: 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.hasEarlyErrors() || (compilerOptions.warnAsError && errors.length > 0)) {
+                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);

Diff for: src/compiler/types.ts

@@ -1092,6 +1092,7 @@ module ts {
         sourceRoot?: string;
         target?: ScriptTarget;
         version?: boolean;
+        warnAsError?: boolean;
         watch?: boolean;
         [option: string]: any;
     }