sveltejs / svelte

Cybernetically enhanced web apps

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TypeScript

Architecture: compiler-framework

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svelte

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svelte

src

compiler

internal

reactivity

runtime

playgrounds

package.json

Structural Architecture

Svelte 5's new architecture isolates the template parsing compiler logic away from the intensely optimized runtime signal implementations. Svelte essentially organizes as a massive compiler resolving templates seamlessly into its internal vanilla JS runtime.

Compiler-first structuring. Distinct boundaries blocking runtime code from compilation execution paths.

Notable Directories

/packages/svelte

The overarching monorepo structure holding the engine logic.

/packages/svelte/src/compiler

The core AST parser resolving HTML/Svelte elements.

/packages/svelte/src/runtime

The minimalistic reactive signal execution context injected into user code.

Build Your Own Ecosystem

Learn from svelte's structure and craft your own software scaffolding.