sveltejs/svelte.dev

Tutorial Solution Bug

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#1,954 opened on Apr 27, 2026

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good first issue

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Description

The solution script for the $effects tutorial found at 'apps/svelte.dev/content/tutorial/01-svelte/02-reactivity/05-effects/+assets/app-b/src/lib/App.svelte' has a minor bug: Pressing the slow down button too many times make the counter go up really fast from a certain threshold. I'd guess it is a 32-bit integer overflow.

Contributor guide

Research direction
Inspect the tutorial solution file at apps/svelte.dev/content/tutorial/01 svelte/02 reactivity/05 effects/+assets/app b/src/lib/App.svelte. Look for counter logic where slowdown button might cause integer overflow (likely 32 bit). Check for unguarded decrement or incorrect data type. Fix by using a safe integer or clamping the value.
Tech stack
sveltejavascript
Domain
frontenddocumentation
Issue type
Bug
DifficultyEstimated implementation difficulty for a new contributor, from 1 for very small changes to 5 for expert-level work.
2
Estimated timeA rough time range for an experienced contributor to investigate, implement, test, and prepare a pull request.
1-3 hours
Activity statusHow available the issue appears right now: fresh, active, stale, blocked, or waiting on maintainer input.
Active
ClarityHow clearly the issue explains the expected change, acceptance criteria, and next step.
Clear
Prerequisites
Svelte
Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.
80