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ReactErrorUtils.js
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ReactErrorUtils.js
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/**
* 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.
*
* @providesModule ReactErrorUtils
* @typechecks
*/
'use strict';
var caughtError = null;
var ReactErrorUtils = {
/**
* Call a function while guarding against errors that happens within it.
*
* @param name (?String) name of the guard to use for logging or debugging
* @param func (Function) function to invoke
* @param a (*) a First argument
* @param b (*) b Second argument
*/
invokeGuardedCallback: function(name, func, a, b) {
try {
return func(a, b);
} catch(x) {
if (caughtError === null) {
caughtError = x;
}
return undefined;
}
},
/**
* During execution of guarded functions we will capture the first error which
* we will rethrow to be handled by the top level error handler.
*/
rethrowCaughtError: function() {
if (caughtError) {
var error = caughtError;
caughtError = null;
throw error;
}
},
};
if (__DEV__) {
/**
* To help development we can get better devtools integration by simulating a
* real browser event.
*/
if (typeof window !== 'undefined' &&
typeof window.dispatchEvent === 'function' &&
typeof Event === 'function') {
var fakeNode = document.createElement('react');
ReactErrorUtils.invokeGuardedCallback = function(name, func, a, b) {
var boundFunc = func.bind(null, a, b);
fakeNode.addEventListener(name, boundFunc, false);
fakeNode.dispatchEvent(new Event(name));
fakeNode.removeEventListener(name, boundFunc, false);
};
}
}
module.exports = ReactErrorUtils;