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fix: respect the unidirectional nature of time #14541

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merged 2 commits into from
Dec 4, 2024
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fix: respect the unidirectional nature of time #14541

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520a140
fix: respect the unidirectional nature of time
Rich-Harris Dec 4, 2024
556eec9
note to our future selves
Rich-Harris Dec 4, 2024
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5 changes: 5 additions & 0 deletions .changeset/sixty-tables-fold.md
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Original file line number Diff line number Diff line change
@@ -0,0 +1,5 @@
---
'svelte': patch
---

fix: respect the unidirectional nature of time
7 changes: 5 additions & 2 deletions packages/svelte/src/internal/client/loop.js
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Expand Up @@ -4,10 +4,13 @@ import { raf } from './timing.js';
// TODO move this into timing.js where it probably belongs

/**
* @param {number} now
* @returns {void}
*/
function run_tasks(now) {
function run_tasks() {
// use `raf.now()` instead of the `requestAnimationFrame` callback argument, because
// otherwise things can get wonky https://github.com/sveltejs/svelte/pull/14541
const now = raf.now();

raf.tasks.forEach((task) => {
if (!task.c(now)) {
raf.tasks.delete(task);
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