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After almost 18 months of development, comprising thousands of commits from dozens of contributors, Svelte 5 is finally stable.
It's the most significant release in the project's history. Svelte 5 is a ground-up rewrite: your apps will be faster, smaller and more reliable. You'll be able to write more consistent and idiomatic code. For newcomers to the framework, there's less stuff to learn.
Despite all that, Svelte is almost completely backwards-compatible with Svelte 4 — for the majority of users, the initial upgrade will be completely seamless:
{ "devDependencies": { "@sveltejs/vite-plugin-svelte": "^3.0.0", "svelte": "^4", "@sveltejs/vite-plugin-svelte": "^4.0.0", "svelte": "^5", // … } }
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