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

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+/**
+ * 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
+ *
+ * -- disabled flow due to mysterious validation errors --
+ */
+
+'use strict';
+
+var Promise = require('Promise');
+var RCTSourceCode = require('NativeModules').SourceCode;
+var SourceMapConsumer = require('SourceMap').SourceMapConsumer;
+var SourceMapURL = require('./source-map-url');
+
+var fetch = require('fetch');
+
+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'));
+  }
+
+  return new Promise(RCTSourceCode.getScriptText)
+    .then(extractSourceMapURL)
+    .then(fetch)
+    .then(response => response.text())
+}
+
+function extractSourceMapURL({url, text}): string {
+  var mapURL = SourceMapURL.getFrom(text);
+  var baseURL = url.match(/(.+:\/\/.*?)\//)[1];
+  return baseURL + mapURL;
+}
+
+module.exports = loadSourceMap;