fix: properly compare TypedArrays of all types#15178
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SimenB merged 2 commits intojestjs:mainfrom Jul 11, 2024
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SimenB
commented
Jul 11, 2024
| const a = Uint8Array.from([2, 4]).buffer; | ||
| const b = Uint16Array.from([1, 7]).buffer; | ||
| expect(arrayBufferEquality(a, b)).not.toBeTruthy(); | ||
| expect(arrayBufferEquality(a, b)).toBe(false); |
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this was a separate bug - it returned undefined, not false since Uint16Array.from([1, 7]).buffer instanceOf ArrayBuffer for some reason is `false.
SimenB
commented
Jul 11, 2024
| let dataViewB = b; | ||
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| if (a instanceof ArrayBuffer && b instanceof ArrayBuffer) { | ||
| if (isArrayBuffer(a) && isArrayBuffer(b)) { |
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this is to fix https://github.com/jestjs/jest/pull/15178/files#r1673797042
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Summary
This partially addresses #15176, in that it
toEqualcall drop from 500ms to 100ms (due to us not using the iterator, but iterating "normally" which is 5x faster)toStrictEqualit drops to 3-4 ms, comparable tolodashimplementation (without the changes in this PR, there is no difference betweentoEqualandtoStrictEqual)There might be a case for us to include
arrayBufferEqualityin the custom matchers we use intoEqualhere:jest/packages/expect/src/matchers.ts
Lines 626 to 629 in 76514a8
In that case,
toEqualalso drops down to 3-4 ms runtime.Test plan
Tests added