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“The Svelte compiler transforms Single File Components into optimized JavaScript modules. It consists of a Lexer/Parser, an AST Analyzer, an Optimizer, and Code Generators for both Client DOM and Server-Side Rendering (SSR).”
The journey from .svelte SFC to optimized ESM JavaScript and CSS artifacts.
// Component source
<script>
let name = $state('World');
</script>
<h1>Hello {name}!</h1>
<style>
h1 { color: #ff3e00; }
</style>Modify the state variable below to watch the signal update the output without VDOM diffing:
Dead-code elimination strips any unused runtime helpers, resulting in initial bundle sizes under 15KB.