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Adds why-did-you-update and example change. (mattermost#512)
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,60 @@ | ||
| 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; | ||
| } | ||
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| // Step 6.a: NaN == NaN | ||
| return x !== x && y !== y; | ||
| } | ||
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| function deepIs(x, y) { | ||
| return JSON.stringify(x) === JSON.stringify(y); | ||
| } | ||
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| /* | ||
| * Adaptation of https://github.com/facebook/fbjs/blob/c69904a511b900266935168223063dd8772dfc40/packages/fbjs/src/core/shallowEqual.js | ||
| * that allows specific keys to use a more expensive deep equality check. | ||
| */ | ||
| function shallowEqualExceptKeys(objA, objB, deepKeys = []) { | ||
| if (is(objA, objB)) { | ||
| return true; | ||
| } | ||
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| 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])) { | ||
| return false; | ||
| } | ||
| if (deepKeys.includes(keysA[i]) && !deepIs(objA[keysA[i]], objB[keysA[i]])) { | ||
| return false; | ||
| } | ||
| if (!deepKeys.includes(keysA[i]) && !is(objA[keysA[i]], objB[keysA[i]])) { | ||
| return false; | ||
| } | ||
| } | ||
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| return true; | ||
| } | ||
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| module.exports = shallowEqualExceptKeys; |
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