react-native/Libraries/JavaScriptAppEngine/Initialization/loadSourceMap.js

67 lines
1.8 KiB
JavaScript

/**
* Copyright (c) 2015-present, 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.
*
* @providesModule loadSourceMap
* @flow
*/
'use strict';
var Promise = require('Promise');
var NativeModules = require('NativeModules');
var SourceMapConsumer = require('SourceMap').SourceMapConsumer;
var SourceMapURL = require('./source-map-url');
var RCTSourceCode = NativeModules.SourceCode;
var RCTNetworking = NativeModules.Networking;
function loadSourceMap(): Promise {
return fetchSourceMap()
.then(map => new SourceMapConsumer(map));
}
function fetchSourceMap(): Promise {
if (global.RAW_SOURCE_MAP) {
return Promise.resolve(global.RAW_SOURCE_MAP);
}
if (!RCTSourceCode) {
return Promise.reject(new Error('RCTSourceCode module is not available'));
}
if (!RCTNetworking) {
// Used internally by fetch
return Promise.reject(new Error('RCTNetworking module is not available'));
}
return new Promise(RCTSourceCode.getScriptText)
.then(extractSourceMapURL)
.then((url) => {
if (url === null) {
return Promise.reject(new Error('No source map URL found. May be running from bundled file.'));
}
return Promise.resolve(url);
})
.then(fetch)
.then(response => response.text());
}
function extractSourceMapURL({url, text, fullSourceMappingURL}): ?string {
if (fullSourceMappingURL) {
return fullSourceMappingURL;
}
var mapURL = SourceMapURL.getFrom(text);
if (!mapURL) {
return null;
}
var baseURL = url.match(/(.+:\/\/.*?)\//)[1];
return baseURL + mapURL;
}
module.exports = loadSourceMap;