react-native/Libraries/Core/Devtools/getDevServer.js

41 lines
1.1 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 getDevServer
* @flow
*/
'use strict';
const {SourceCode} = require('NativeModules');
let _cachedDevServerURL: ?string;
const FALLBACK = 'http://localhost:8081/';
type DevServerInfo = {
url: string,
bundleLoadedFromServer: boolean,
};
/**
* Many RN development tools rely on the development server (packager) running
* @return URL to packager with trailing slash
*/
function getDevServer(): DevServerInfo {
if (_cachedDevServerURL === undefined) {
const match = SourceCode.scriptURL && SourceCode.scriptURL.match(/^https?:\/\/.*?\//);
_cachedDevServerURL = match ? match[0] : null;
}
return {
url: _cachedDevServerURL || FALLBACK,
bundleLoadedFromServer: _cachedDevServerURL !== null,
};
}
module.exports = getDevServer;