initial support for system module

Author: vladima

Diff for: src/compiler/checker.ts

@@ -10616,9 +10616,15 @@ module ts {
 
             checkExternalModuleExports(container);
 
-            if (node.isExportEquals && languageVersion >= ScriptTarget.ES6) {
-                // export assignment is deprecated in es6 or above
-                grammarErrorOnNode(node, Diagnostics.Export_assignment_cannot_be_used_when_targeting_ECMAScript_6_or_higher_Consider_using_export_default_instead);
+            if (node.isExportEquals) {
+                if (languageVersion >= ScriptTarget.ES6) {
+                    // export assignment is deprecated in es6 or above
+                    grammarErrorOnNode(node, Diagnostics.Export_assignment_cannot_be_used_when_targeting_ECMAScript_6_or_higher_Consider_using_export_default_instead);
+                }
+                else if (compilerOptions.module === ModuleKind.System) {
+                    // system modules does not support export assignment
+                    grammarErrorOnNode(node, Diagnostics.Export_assignment_is_not_supported_with_module_flag_is_system);
+                }
             }
         }
 
@@ -11432,9 +11438,11 @@ module ts {
 
         function getExportNameSubstitution(symbol: Symbol, location: Node, getGeneratedNameForNode: (Node: Node) => string): string {
             if (isExternalModuleSymbol(symbol.parent)) {
-                // If this is es6 or higher, just use the name of the export
+                // 1. If this is es6 or higher, just use the name of the export
                 // no need to qualify it.
-                if (languageVersion >= ScriptTarget.ES6) {
+                // 2. export mechanism for System modules is different from CJS\AMD
+                // and it does not need qualifications for exports
+                if (languageVersion >= ScriptTarget.ES6 || compilerOptions.module === ModuleKind.System) {
                     return undefined;
                 }
                 return "exports." + unescapeIdentifier(symbol.name);

Diff for: src/compiler/commandLineParser.ts

@@ -50,11 +50,12 @@ module ts {
             shortName: "m",
             type: {
                 "commonjs": ModuleKind.CommonJS,
-                "amd": ModuleKind.AMD
+                "amd": ModuleKind.AMD,
+                "system": ModuleKind.System,
             },
-            description: Diagnostics.Specify_module_code_generation_Colon_commonjs_or_amd,
+            description: Diagnostics.Specify_module_code_generation_Colon_commonjs_system_or_amd,
             paramType: Diagnostics.KIND,
-            error: Diagnostics.Argument_for_module_option_must_be_commonjs_or_amd
+            error: Diagnostics.Argument_for_module_option_must_be_commonjs_system_or_amd
         },
         {
             name: "noEmit",

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

@@ -161,14 +161,15 @@ module ts {
         A_type_annotation_on_an_export_statement_is_only_allowed_in_an_ambient_external_module_declaration: { code: 1201, category: DiagnosticCategory.Error, key: "A type annotation on an export statement is only allowed in an ambient external module declaration." },
         Import_assignment_cannot_be_used_when_targeting_ECMAScript_6_or_higher_Consider_using_import_Asterisk_as_ns_from_mod_import_a_from_mod_or_import_d_from_mod_instead: { code: 1202, category: DiagnosticCategory.Error, key: "Import assignment cannot be used when targeting ECMAScript 6 or higher. Consider using 'import * as ns from \"mod\"', 'import {a} from \"mod\"' or 'import d from \"mod\"' instead." },
         Export_assignment_cannot_be_used_when_targeting_ECMAScript_6_or_higher_Consider_using_export_default_instead: { code: 1203, category: DiagnosticCategory.Error, key: "Export assignment cannot be used when targeting ECMAScript 6 or higher. Consider using 'export default' instead." },
-        Cannot_compile_external_modules_into_amd_or_commonjs_when_targeting_es6_or_higher: { code: 1204, category: DiagnosticCategory.Error, key: "Cannot compile external modules into amd or commonjs when targeting es6 or higher." },
+        Cannot_compile_external_modules_into_amd_system_or_commonjs_when_targeting_es6_or_higher: { code: 1204, category: DiagnosticCategory.Error, key: "Cannot compile external modules into amd, system or commonjs when targeting es6 or higher." },
         Decorators_are_only_available_when_targeting_ECMAScript_5_and_higher: { code: 1205, category: DiagnosticCategory.Error, key: "Decorators are only available when targeting ECMAScript 5 and higher." },
         Decorators_are_not_valid_here: { code: 1206, category: DiagnosticCategory.Error, key: "Decorators are not valid here." },
         Decorators_cannot_be_applied_to_multiple_get_Slashset_accessors_of_the_same_name: { code: 1207, category: DiagnosticCategory.Error, key: "Decorators cannot be applied to multiple get/set accessors of the same name." },
         Cannot_compile_non_external_modules_when_the_separateCompilation_flag_is_provided: { code: 1208, category: DiagnosticCategory.Error, key: "Cannot compile non-external modules when the '--separateCompilation' flag is provided." },
         Ambient_const_enums_are_not_allowed_when_the_separateCompilation_flag_is_provided: { code: 1209, category: DiagnosticCategory.Error, key: "Ambient const enums are not allowed when the '--separateCompilation' flag is provided." },
         Invalid_use_of_0_Class_definitions_are_automatically_in_strict_mode: { code: 1210, category: DiagnosticCategory.Error, key: "Invalid use of '{0}'. Class definitions are automatically in strict mode." },
         A_class_declaration_without_the_default_modifier_must_have_a_name: { code: 1211, category: DiagnosticCategory.Error, key: "A class declaration without the 'default' modifier must have a name" },
+        Export_assignment_is_not_supported_with_module_flag_is_system: { code: 1212, category: DiagnosticCategory.Error, key: "Export assignment is not supported with '--module' flag is 'system'." },
         Duplicate_identifier_0: { code: 2300, category: DiagnosticCategory.Error, key: "Duplicate identifier '{0}'." },
         Initializer_of_instance_member_variable_0_cannot_reference_identifier_1_declared_in_the_constructor: { code: 2301, category: DiagnosticCategory.Error, key: "Initializer of instance member variable '{0}' cannot reference identifier '{1}' declared in the constructor." },
         Static_members_cannot_reference_class_type_parameters: { code: 2302, category: DiagnosticCategory.Error, key: "Static members cannot reference class type parameters." },
@@ -456,7 +457,7 @@ module ts {
         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'" },
+        Specify_module_code_generation_Colon_commonjs_system_or_amd: { code: 6016, category: DiagnosticCategory.Message, key: "Specify module code generation: 'commonjs', 'system' or 'amd'" },
         Print_this_message: { code: 6017, category: DiagnosticCategory.Message, key: "Print this message." },
         Print_the_compiler_s_version: { code: 6019, category: DiagnosticCategory.Message, key: "Print the compiler's version." },
         Compile_the_project_in_the_given_directory: { code: 6020, category: DiagnosticCategory.Message, key: "Compile the project in the given directory." },
@@ -477,7 +478,7 @@ module ts {
         Generates_corresponding_map_file: { code: 6043, category: DiagnosticCategory.Message, key: "Generates corresponding '.map' file." },
         Compiler_option_0_expects_an_argument: { code: 6044, category: DiagnosticCategory.Error, key: "Compiler option '{0}' expects an argument." },
         Unterminated_quoted_string_in_response_file_0: { code: 6045, category: DiagnosticCategory.Error, key: "Unterminated quoted string in response file '{0}'." },
-        Argument_for_module_option_must_be_commonjs_or_amd: { code: 6046, category: DiagnosticCategory.Error, key: "Argument for '--module' option must be 'commonjs' or 'amd'." },
+        Argument_for_module_option_must_be_commonjs_system_or_amd: { code: 6046, category: DiagnosticCategory.Error, key: "Argument for '--module' option must be 'commonjs', 'system' or 'amd'." },
         Argument_for_target_option_must_be_es3_es5_or_es6: { code: 6047, category: DiagnosticCategory.Error, key: "Argument for '--target' option must be 'es3', 'es5', or 'es6'." },
         Locale_must_be_of_the_form_language_or_language_territory_For_example_0_or_1: { code: 6048, category: DiagnosticCategory.Error, key: "Locale must be of the form <language> or <language>-<territory>. For example '{0}' or '{1}'." },
         Unsupported_locale_0: { code: 6049, category: DiagnosticCategory.Error, key: "Unsupported locale '{0}'." },

Diff for: src/compiler/diagnosticMessages.json

@@ -635,7 +635,7 @@
         "category": "Error",
         "code": 1203
     },
-    "Cannot compile external modules into amd or commonjs when targeting es6 or higher.": {
+    "Cannot compile external modules into amd, system or commonjs when targeting es6 or higher.": {
         "category": "Error",
         "code": 1204
     },
@@ -667,6 +667,10 @@
         "category": "Error",
         "code": 1211
     },
+    "Export assignment is not supported with '--module' flag is 'system'.": {
+        "category": "Error",
+        "code": 1212
+    },
     "Duplicate identifier '{0}'.": {
         "category": "Error",
         "code": 2300
@@ -1816,7 +1820,7 @@
         "category": "Message",
         "code": 6015
     },
-    "Specify module code generation: 'commonjs' or 'amd'": {
+    "Specify module code generation: 'commonjs', 'system' or 'amd'": {
         "category": "Message",
         "code": 6016
     },
@@ -1900,7 +1904,7 @@
         "category": "Error",
         "code": 6045
     },
-    "Argument for '--module' option must be 'commonjs' or 'amd'.": {
+    "Argument for '--module' option must be 'commonjs', 'system' or 'amd'.": {
         "category": "Error",
         "code": 6046
     },