react-native/Libraries/Promise.js

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/**
* Copyright (c) 2016-present, Facebook, Inc.
* All rights reserved.
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*
* 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.
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*
* @providesModule Promise
* @flow
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*/
'use strict';
const Promise = require('fbjs/lib/Promise.native');
if (__DEV__) {
require('promise/setimmediate/rejection-tracking').enable({
allRejections: true,
onUnhandled: (id, error = {}) => {
let message: string;
let stack: ?string;
const stringValue = Object.prototype.toString.call(error);
if (stringValue === '[object Error]') {
message = Error.prototype.toString.call(error);
stack = error.stack;
} else {
message = require('pretty-format')(error);
}
const warning =
`Possible Unhandled Promise Rejection (id: ${id}):\n` +
`${message}\n` +
(stack == null ? '' : stack);
console.warn(warning);
},
onHandled: (id) => {
const warning =
`Promise Rejection Handled (id: ${id})\n` +
'This means you can ignore any previous messages of the form ' +
`"Possible Unhandled Promise Rejection (id: ${id}):"`;
console.warn(warning);
},
});
}
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module.exports = Promise;