main.js

/**
 * Copyright 2013-2015, Facebook, Inc.
 * All rights reserved.
 *
 * This source code is licensed under the BSD-style license found in the
 * LICENSE file in the root directory of this source tree. An additional grant
 * of patent rights can be found in the PATENTS file in the same directory.
 */

'use strict';
/*eslint-disable no-undef*/
var visitors = require('./vendor/fbtransform/visitors');
var transform = require('jstransform').transform;
var typesSyntax = require('jstransform/visitors/type-syntax');
var inlineSourceMap = require('./vendor/inline-source-map');

module.exports = {
 transform: function(input, options) {
 options = processOptions(options);
 var output = innerTransform(input, options);
 var result = output.code;
 if (options.sourceMap) {
 var map = inlineSourceMap(
 output.sourceMap,
 input,
 options.filename
 );
 result += '\n' + map;
 }
 return result;
 },
 transformWithDetails: function(input, options) {
 options = processOptions(options);
 var output = innerTransform(input, options);
 var result = {};
 result.code = output.code;
 if (options.sourceMap) {
 result.sourceMap = output.sourceMap.toJSON();
 }
 if (options.filename) {
 result.sourceMap.sources = [options.filename];
 }
 return result;
 }
};

/**
 * Only copy the values that we need. We'll do some preprocessing to account for
 * converting command line flags to options that jstransform can actually use.
 */
function processOptions(opts) {
 opts = opts || {};
 var options = {};

 options.harmony = opts.harmony;
 options.stripTypes = opts.stripTypes;
 options.sourceMap = opts.sourceMap;
 options.filename = opts.sourceFilename;

 if (opts.es6module) {
 options.sourceType = 'module';
 }
 if (opts.nonStrictEs6module) {
 options.sourceType = 'nonStrictModule';
 }

 // Instead of doing any fancy validation, only look for 'es3'. If we have
 // that, then use it. Otherwise use 'es5'.
 options.es3 = opts.target === 'es3';
 options.es5 = !options.es3;

 return options;
}

function innerTransform(input, options) {
 var visitorSets = ['react'];
 if (options.harmony) {
 visitorSets.push('harmony');
 }

 if (options.es3) {
 visitorSets.push('es3');
 }

 if (options.stripTypes) {
 // Stripping types needs to happen before the other transforms
 // unfortunately, due to bad interactions. For example,
 // es6-rest-param-visitors conflict with stripping rest param type
 // annotation
 input = transform(typesSyntax.visitorList, input, options).code;
 }

 var visitorList = visitors.getVisitorsBySet(visitorSets);
 return transform(visitorList, input, options);
}