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fix: improve array mutation validation warnings #14729

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@trueadm trueadm commented Dec 16, 2024

Closes #14705.

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🦋 Changeset detected

Latest commit: 45875e9

The changes in this PR will be included in the next version bump.

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pnpm add https://pkg.pr.new/svelte@14729

@@ -16,7 +23,7 @@ export function init_array_prototype_warnings() {
array_prototype.indexOf = function (item, from_index) {
const index = indexOf.call(this, item, from_index);

if (index === -1) {
if (index === -1 && is_object(item)) {
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What I don't quite understand is why the proxied version would give a different result - is it not updated yet to the latest value?

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@trueadm trueadm Dec 16, 2024

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We don't modify the original object on mutations to the proxied object, so here the proxied version is [] and the original object is [1], so it triggers the warning because it first checks if the proxied array has it, then checks if the original array has it.

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This doesn't seem right at all. The issue is that we're comparing the proxied array with its target, when we should be comparing the proxied items with their targets. Notice how in this repro the warnings still occur after you've cleared the array.

Opened #14738

@trueadm trueadm closed this Dec 17, 2024
@trueadm trueadm deleted the fix-warning branch December 17, 2024 17:21
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Successfully merging this pull request may close these issues.

Warning: state_proxy_equality_mismatch when checking Array.prototype.includes after emptying the array
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