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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -1,3 +1,70 @@ | ||
| import shallowEqual from 'fbjs/lib/shallowEqual' | ||
| /** | ||
| * Copyright (c) 2013-present, Facebook, Inc. | ||
| * | ||
| * This source code is licensed under the MIT license found in the | ||
| * LICENSE file in the root directory of this source tree. | ||
| * | ||
| * @providesModule shallowEqual | ||
| * @typechecks | ||
| */ | ||
|
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| /* eslint-disable no-self-compare */ | ||
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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, y) { | ||
| // 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 | ||
| } | ||
| // 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, objB) { | ||
| 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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| export default shallowEqual |
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