gistfile1.js

var traceur      = require('traceur');

traceur.options.blockBinding = true;
traceur.options.sourceMaps = true;
//traceur.options.strictSemicolons = true; // @bug: does not work with classes currently
traceur.options.deferredFunctions = true;
traceur.options.modules = true; // 'nodejs'
  
//
// Compile the content from ES6 to ES5
//

var ErrorReporter = traceur.util.ErrorReporter;
var SourceFile = traceur.syntax.SourceFile;
var Parser = traceur.syntax.Parser;
var FromOptionsTransformer = traceur.codegeneration.FromOptionsTransformer;
var TreeWriter = traceur.outputgeneration.TreeWriter;

var errorReporter = new ErrorReporter();
var sourceFile = new SourceFile(relPath, content);
var sourceMapGenerator = new traceur.outputgeneration.SourceMapGenerator({file: relPath});
var parser = new Parser(errorReporter, sourceFile);

var tree = parser.parseModule();
tree.url = relPath;
var transformer = new FromOptionsTransformer(errorReporter);
var transformed = transformer.transform(tree);
var options = {sourceMapGenerator: sourceMapGenerator};
var compiledContent = TreeWriter.write(transformed, options);
var sourceMap = options.sourceMap;