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Removed dependency on fbjs (react-navigation#1698)
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Original file line number | Diff line number | Diff line change |
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@@ -0,0 +1,60 @@ | ||
/** | ||
* Copyright (c) 2013-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 invariant | ||
*/ | ||
|
||
'use strict'; | ||
|
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/** | ||
* Use invariant() to assert state which your program assumes to be true. | ||
* | ||
* Provide sprintf-style format (only %s is supported) and arguments | ||
* to provide information about what broke and what you were | ||
* expecting. | ||
* | ||
* The invariant message will be stripped in production, but the invariant | ||
* will remain to ensure logic does not differ in production. | ||
*/ | ||
|
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var validateFormat = function(format) {}; | ||
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if (__DEV__) { | ||
validateFormat = function(format) { | ||
if (format === undefined) { | ||
throw new Error('invariant requires an error message argument'); | ||
} | ||
}; | ||
} | ||
|
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function invariant(condition, format, a, b, c, d, e, f) { | ||
validateFormat(format); | ||
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if (!condition) { | ||
var error; | ||
if (format === undefined) { | ||
error = new Error( | ||
'Minified exception occurred; use the non-minified dev environment for the full error message and additional helpful warnings.' | ||
); | ||
} else { | ||
var args = [a, b, c, d, e, f]; | ||
var argIndex = 0; | ||
error = new Error( | ||
format.replace(/%s/g, function() { | ||
return args[argIndex++]; | ||
}) | ||
); | ||
error.name = 'Invariant Violation'; | ||
} | ||
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error.framesToPop = 1; // we don't care about invariant's own frame | ||
throw error; | ||
} | ||
} | ||
|
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module.exports = invariant; |
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Original file line number | Diff line number | Diff line change |
---|---|---|
@@ -0,0 +1,75 @@ | ||
/** | ||
* Copyright (c) 2013-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 shallowEqual | ||
* @typechecks | ||
* @flow | ||
*/ | ||
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/*eslint-disable no-self-compare */ | ||
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'use strict'; | ||
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const hasOwnProperty = Object.prototype.hasOwnProperty; | ||
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/** | ||
* inlined Object.is polyfill to avoid requiring consumers ship their own | ||
* https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object/is | ||
*/ | ||
function is(x: mixed, y: mixed): boolean { | ||
// SameValue algorithm | ||
if (x === y) { | ||
// Steps 1-5, 7-10 | ||
// Steps 6.b-6.e: +0 != -0 | ||
// Added the nonzero y check to make Flow happy, but it is redundant | ||
return x !== 0 || y !== 0 || 1 / x === 1 / y; | ||
} else { | ||
// Step 6.a: NaN == NaN | ||
return x !== x && y !== y; | ||
} | ||
} | ||
|
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/** | ||
* Performs equality by iterating through keys on an object and returning false | ||
* when any key has values which are not strictly equal between the arguments. | ||
* Returns true when the values of all keys are strictly equal. | ||
*/ | ||
function shallowEqual(objA: mixed, objB: mixed): boolean { | ||
if (is(objA, objB)) { | ||
return true; | ||
} | ||
if ( | ||
typeof objA !== 'object' || | ||
objA === null || | ||
typeof objB !== 'object' || | ||
objB === null | ||
) { | ||
return false; | ||
} | ||
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const keysA = Object.keys(objA); | ||
const keysB = Object.keys(objB); | ||
|
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if (keysA.length !== keysB.length) { | ||
return false; | ||
} | ||
|
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// Test for A's keys different from B. | ||
for (let i = 0; i < keysA.length; i++) { | ||
if ( | ||
!hasOwnProperty.call(objB, keysA[i]) || | ||
!is(objA[keysA[i]], objB[keysA[i]]) | ||
) { | ||
return false; | ||
} | ||
} | ||
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return true; | ||
} | ||
|
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module.exports = shallowEqual; |
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