Looking into the Svelte Compiler
summary
Svelte parses .svelte files into an AST (it hands JS to Acorn), analyzes variable scope and dependencies, and emits optimized JS and scoped CSS plus source maps. Runtime size drops by avoiding a virtual DOM (React ~40KB gzipped, Vue 2 ~23KB, Vue 3 ~10KB) because the compiler generates per-component code: an instance with instrumented invalidation, a create fragment recipe object (methods c/m/p/d), and SSR as a simple template-returning function. Reactive behavior comes from reactive declarations and injected variables tracked during analysis.
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chapters (13)
- 0:00Start
- 4:18Reactive Declarations
- 10:40Analyze the Ast
- 12:28Traverse the Template Ast
- 14:32The Rendering Phase
- 14:59Fragment Block
- 18:43Server-Side Rendering Targets
- 19:57The Spell Compilation Process
- 26:10Does Svelte Do any Beybladifying in Outbreak
- 26:58Source Mapping
- 27:51Svelte Is a Good Platform for Learning Javascript
- 31:06Are There Server-Side Rendering Frameworks Specifically for Swelt
- 33:17What Is the Bundle Size Difference between Svelte and Other Frameworks and Libraries
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