Merge pull request #1501 from Arnavion/no-emit

Add -noEmit compiler flag that skips the emit stage in ts.compile()

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: "noEmit",
+            type: "boolean",
+            description: Diagnostics.Do_not_emit_outputs,
+        },
         {
             name: "noEmitOnError",
             type: "boolean",

src/compiler/diagnosticInformationMap.generated.ts

@@ -380,6 +380,8 @@ module ts {
         Could_not_write_file_0_Colon_1: { code: 5033, category: DiagnosticCategory.Error, key: "Could not write file '{0}': {1}" },
         Option_mapRoot_cannot_be_specified_without_specifying_sourcemap_option: { code: 5038, category: DiagnosticCategory.Error, key: "Option mapRoot cannot be specified without specifying sourcemap option." },
         Option_sourceRoot_cannot_be_specified_without_specifying_sourcemap_option: { code: 5039, category: DiagnosticCategory.Error, key: "Option sourceRoot cannot be specified without specifying sourcemap option." },
+        Option_noEmit_cannot_be_specified_with_option_out_or_outDir: { code: 5040, category: DiagnosticCategory.Error, key: "Option noEmit cannot be specified with option out or outDir." },
+        Option_noEmit_cannot_be_specified_with_option_declaration: { code: 5041, category: DiagnosticCategory.Error, key: "Option noEmit cannot be specified with option declaration." },
         Concatenate_and_emit_output_to_single_file: { code: 6001, category: DiagnosticCategory.Message, key: "Concatenate and emit output to single file." },
         Generates_corresponding_d_ts_file: { code: 6002, category: DiagnosticCategory.Message, key: "Generates corresponding '.d.ts' file." },
         Specifies_the_location_where_debugger_should_locate_map_files_instead_of_generated_locations: { code: 6003, category: DiagnosticCategory.Message, key: "Specifies the location where debugger should locate map files instead of generated locations." },
@@ -389,6 +391,7 @@ module ts {
         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." },
+        Do_not_emit_outputs: { code: 6010, category: DiagnosticCategory.Message, key: "Do not emit outputs." },
         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'" },
         Print_this_message: { code: 6017, category: DiagnosticCategory.Message, key: "Print this message." },

src/compiler/diagnosticMessages.json

@@ -1616,6 +1616,14 @@
         "category": "Error",
         "code": 5039
     },
+    "Option noEmit cannot be specified with option out or outDir.": {
+        "category": "Error",
+        "code": 5040
+    },
+    "Option noEmit cannot be specified with option declaration.": {
+        "category": "Error",
+        "code": 5041
+    },
     "Concatenate and emit output to single file.": {
         "category": "Message",
         "code": 6001
@@ -1652,6 +1660,10 @@
         "category": "Message",
         "code": 6009
     },
+    "Do not emit outputs.": {
+        "category": "Message",
+        "code": 6010
+    },
     "Specify ECMAScript target version: 'ES3' (default), 'ES5', or 'ES6' (experimental)": {
         "category": "Message",
         "code": 6015

src/compiler/parser.ts

@@ -5126,6 +5126,16 @@ module ts {
                     commonSourceDirectory += directorySeparator;
                 }
             }
+
+            if (options.noEmit) {
+                if (options.out || options.outDir) {
+                    errors.push(createCompilerDiagnostic(Diagnostics.Option_noEmit_cannot_be_specified_with_option_out_or_outDir));
+                }
+
+                if (options.declaration) {
+                    errors.push(createCompilerDiagnostic(Diagnostics.Option_noEmit_cannot_be_specified_with_option_declaration));
+                }
+            }
         }
     }
 }

src/compiler/tsc.ts

@@ -296,6 +296,9 @@ module ts {
             if (checker.isEmitBlocked()) {
                 exitStatus = EmitReturnStatus.AllOutputGenerationSkipped;
             }
+            else if (compilerOptions.noEmit) {
+                exitStatus = EmitReturnStatus.Succeeded;
+            }
             else {
                 var emitStart = new Date().getTime();
                 var emitOutput = checker.emitFiles();

src/compiler/types.ts

@@ -959,7 +959,7 @@ module ts {
 
     // Return code used by getEmitOutput function to indicate status of the function
     export enum EmitReturnStatus {
-        Succeeded = 0,                      // All outputs generated as requested (.js, .map, .d.ts), no errors reported
+        Succeeded = 0,                      // All outputs generated if requested (.js, .map, .d.ts), no errors reported
         AllOutputGenerationSkipped = 1,     // No .js generated because of syntax errors, nothing generated
         JSGeneratedWithSemanticErrors = 2,  // .js and .map generated with semantic errors
         DeclarationGenerationSkipped = 3,   // .d.ts generation skipped because of semantic errors or declaration emitter specific errors; Output .js with semantic errors
@@ -1434,6 +1434,7 @@ module ts {
         locale?: string;
         mapRoot?: string;
         module?: ModuleKind;
+        noEmit?: boolean;
         noEmitOnError?: boolean;
         noErrorTruncation?: boolean;
         noImplicitAny?: boolean;

tests/cases/fourslash/fourslash.ts

@@ -34,7 +34,7 @@ declare var FourSlash;
 // Return code used by getEmitOutput function to indicate status of the function
 // It is a duplicate of the one in types.ts to expose it to testcases in fourslash
 enum EmitReturnStatus {
-    Succeeded = 0,                      // All outputs generated as requested (.js, .map, .d.ts), no errors reported
+    Succeeded = 0,                      // All outputs generated if requested (.js, .map, .d.ts), no errors reported
     AllOutputGenerationSkipped = 1,     // No .js generated because of syntax errors, or compiler options errors, nothing generated
     JSGeneratedWithSemanticErrors = 2,  // .js and .map generated with semantic errors
     DeclarationGenerationSkipped = 3,   // .d.ts generation skipped because of semantic errors or declaration emitter specific errors; Output .js with semantic errors