feat(dart): Use ts2dart for transpilation in Karma Dart.

Author: mprobst

karma-dart.conf.js

@@ -58,25 +58,14 @@ module.exports = function(config) {
     },
 
     preprocessors: {
-      'modules/**/*.js': ['traceur'],
-      'tools/**/*.js': ['traceur']
+      'modules/**/*.js': ['ts2dart'],
+      'tools/**/*.js': ['ts2dart']
     },
 
-    traceurPreprocessor: {
-      options: {
-        outputLanguage: 'dart',
-        sourceMaps: true,
-        script: false,
-        modules: 'register',
-        memberVariables: true,
-        types: true,
-        // typeAssertions: true,
-        // typeAssertionModule: 'assert',
-        annotations: true
-      },
+    ts2dartPreprocessor: {
       resolveModuleName: file2moduleName,
       transformPath: function(fileName) {
-        return fileName.replace('.js', '.dart');
+        return fileName.replace(/.js$/, '.dart');
       }
     },
 
@@ -91,5 +80,5 @@ module.exports = function(config) {
   });
 
 
-  config.plugins.push(require('./tools/transpiler/karma-traceur-preprocessor'));
+  config.plugins.push(require('./tools/transpiler/karma-ts2dart-preprocessor'));
 };

package.json

@@ -96,6 +96,7 @@
     "ternary-stream": "^1.2.3",
     "through2": "^0.6.1",
     "typescript": "alexeagle/TypeScript#93dbbe2a2d0b42cefd02ac949e4bc8ab6b5b5823",
+    "ts2dart": "^0.2.0",
     "vinyl": "^0.4.6",
     "walk-sync": "^0.1.3",
     "xtend": "^4.0.0",

tools/transpiler/karma-ts2dart-preprocessor.js

@@ -0,0 +1,35 @@
+// Transpiles JavaScript and TypeScript code to Dart using ts2dart.
+
+var ts2dart = require('ts2dart');
+var rundartpackage = require('../build/rundartpackage.js');
+
+module.exports = {
+  'preprocessor:ts2dart': ['factory', createTs2DartPreprocessor]
+};
+
+function createTs2DartPreprocessor(logger, basePath, config, emitter) {
+  var log = logger.create('ts2dart');
+  return function(content, file, done) {
+    try {
+      var moduleName = config.resolveModuleName(file.originalPath);
+      file.path = config.transformPath(file.originalPath);
+      var transpiler = new ts2dart.Transpiler();
+      var transpiledContent = transpiler.translateFile(file.originalPath, moduleName);
+      // TODO(martinprobst): Source maps.
+      done(null, transpiledContent);
+    } catch (errors) {
+      var errorString;
+      if (errors.forEach) {
+        errors.forEach(function(error) { log.error(error); });
+        errorString = errors.join('\n');
+      } else {
+        log.error(errors);
+        errorString = errors;
+      }
+      done(new Error('ts2dart compile errors:\n' + errorString));
+    }
+  };
+}
+
+createTs2DartPreprocessor
+    .$inject = ['logger', 'config.basePath', 'config.ts2dartPreprocessor', 'emitter'];