pull/16161/head
raythurnvoid 3 months ago
parent a012b1d1e0
commit 50da9268c3

@ -0,0 +1,33 @@
import { flushSync } from 'svelte';
import { test } from '../../test';
export default test({
/**
* Ensure that mutating an array with push inside an $effect
* does not cause an infinite re-execution loop.
*/
test({ assert, target }) {
const button = target.querySelector('button');
// initial render — effect should have run once
assert.htmlEqual(
target.innerHTML,
`
<button>inc</button>
<p>0</p>
`
);
// increment count; effect should append one new entry only
flushSync(() => button?.click());
assert.htmlEqual(
target.innerHTML,
`
<button>inc</button>
<p>0</p>
<p>1</p>
`
);
}
});

@ -0,0 +1,17 @@
<script>
let count = $state(0);
let log = $state([]);
$effect(() => {
log.push(count);
});
function inc() {
count += 1;
}
</script>
<button on:click={inc}>inc</button>
{#each log as item}
<p>{item}</p>
{/each}
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