old_contents: // Copyright 2014 Traceur Authors.
  //
  // Licensed under the Apache License, Version 2.0 (the "License");
  // you may not use this file except in compliance with the License.
  // You may obtain a copy of the License at
  //
  //      http://www.apache.org/licenses/LICENSE-2.0
  //
  // Unless required by applicable law or agreed to in writing, software
  // distributed under the License is distributed on an "AS IS" BASIS,
  // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  // See the License for the specific language governing permissions and
  // limitations under the License.
  
  // Node.js API
  //
  // This is what you get when you `require('traceur')`.
  // It's suppose to be used by custom scripts or tools such as Grunt or Karma.
  
  'use strict';
  
  var path = require('path');
  var fs = require('fs');
  var util = require('./file-util.js');
  var writeFile = util.writeFile;
  var traceur = require('./traceur.js');
  
  var Compiler = traceur.Compiler;
  
  function NodeCompiler(options, sourceRoot) {
    sourceRoot = sourceRoot || process.cwd();
    Compiler.call(this, options, sourceRoot);
  }
  
  NodeCompiler.prototype = {
    __proto__: Compiler.prototype,
  
    writeTreeToFile: function(tree, filename) {
      filename = this.normalize(filename);
      var compiledCode = this.write(tree, filename);
      if (this.options_.sourceMaps === 'file') {
        var sourcemap = this.getSourceMap();
        if (sourcemap) {
          writeFile(this.sourceMappingURL(filename), sourcemap);
        }
      }
  
      writeFile(filename, compiledCode);
    },
  
    compileSingleFile: function(inputFilePath, outputFilePath, errback) {
      inputFilePath = this.normalize(inputFilePath);
      outputFilePath = this.normalize(outputFilePath);
      fs.readFile(inputFilePath, function(err, contents) {
        if (err) {
          errback(err);
          return;
        }
  
        this.writeTreeToFile(this.transform(
            this.parse(contents.toString(), inputFilePath)), outputFilePath);
      }.bind(this));
    },
  
    sourceMappingURL: function(filename) {
      if (this.options_.sourceMaps === 'inline') {
        var base64sm = new Buffer(this.getSourceMap()).toString('base64');
        return 'data:application/json;base64,' + base64sm;
      }
      return Compiler.prototype.sourceMappingURL.call(this, filename);
    }
  };
  
  
  module.exports = {
    NodeCompiler: NodeCompiler
  };
  
new_contents: // Copyright 2014 Traceur Authors.
  //
  // Licensed under the Apache License, Version 2.0 (the "License");
  // you may not use this file except in compliance with the License.
  // You may obtain a copy of the License at
  //
  //      http://www.apache.org/licenses/LICENSE-2.0
  //
  // Unless required by applicable law or agreed to in writing, software
  // distributed under the License is distributed on an "AS IS" BASIS,
  // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  // See the License for the specific language governing permissions and
  // limitations under the License.
  
  // Node.js API
  //
  // This is what you get when you `require('traceur')`.
  // It's suppose to be used by custom scripts or tools such as Grunt or Karma.
  
  'use strict';
  
  var path = require('path');
  var fs = require('fs');
  var util = require('./file-util.js');
  var writeFile = util.writeFile;
  var traceur = require('./traceur.js');
  
  var Compiler = traceur.Compiler;
  
  function NodeCompiler(options, sourceRoot) {
    sourceRoot = sourceRoot || process.cwd();
    Compiler.call(this, options, sourceRoot);
    this.moduleName = options.moduleName;
  }
  
  NodeCompiler.prototype = {
    __proto__: Compiler.prototype,
  
    writeTreeToFile: function(tree, filename) {
      filename = this.normalize(filename);
      var compiledCode = this.write(tree, filename);
      if (this.options_.sourceMaps === 'file') {
        var sourcemap = this.getSourceMap();
        if (sourcemap) {
          writeFile(this.sourceMappingURL(filename), sourcemap);
        }
      }
  
      writeFile(filename, compiledCode);
    },
  
    compileSingleFile: function(inputFilePath, outputFilePath, errback) {
      inputFilePath = this.normalize(inputFilePath);
      outputFilePath = this.normalize(outputFilePath);
      fs.readFile(inputFilePath, function(err, contents) {
        if (err) {
          errback(err);
          return;
        }
  
        var moduleName = null;
        if (typeof this.moduleName === 'string') {
          moduleName = this.moduleName;
        } else if (this.moduleName) {
          moduleName = inputFilePath;
        }
        var parsed = this.parse(contents.toString(), inputFilePath);
        this.writeTreeToFile(this.transform(parsed, moduleName), outputFilePath);
      }.bind(this));
    },
  
    sourceMappingURL: function(filename) {
      if (this.options_.sourceMaps === 'inline') {
        var base64sm = new Buffer(this.getSourceMap()).toString('base64');
        return 'data:application/json;base64,' + base64sm;
      }
      return Compiler.prototype.sourceMappingURL.call(this, filename);
    }
  };
  
  
  module.exports = {
    NodeCompiler: NodeCompiler
  };
  
subject: Support passing a moduleName for a single file compiles.