Rethinking Reactivity
summary
Spelt compiles declarative components to imperative vanilla JavaScript and moves reactivity into the build step, using labelled $ declarations for reactive bindings and emitting small update functions that run in topological order. Benchmarks show specific wins (roughly 35× faster than React and 50× faster than Vue on a microtest) and real deployments include ~200,000 point‑of‑sale terminals and smart TV apps. Built features include scoped CSS, accessibility warnings, CSS-driven transitions and early WebGL integration, all without runtime dependency tracking.
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chapters (9)
- 0:00The history of reactivity
- 2:06Virtual DOM and React
- 5:42Introducing Svelte
- 8:35Reactivity in Svelte
- 12:52The destiny operator
- 16:02Svelte performance
- 20:03Real-world applications
- 22:10Accessibility and styling
- 27:16Future of Svelte
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