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Dev.to
7/11/2026
Levelo-Js v2: The TypeScript Rebirth

Levelo-Js v2: The TypeScript Rebirth

Short summary

Levelo-Js v2 is a complete rewrite of a lightweight reactive JavaScript framework, now fully in TypeScript with strict type safety, tsup-powered production bundles, and automatic memory-leak prevention via reactive ownership architecture. New features include mount/cleanup lifecycle hooks, improved SPA routing with native 404 handling, and SVG attribute rendering fixes. The framework is available via npm create-levelo-app.

  • Full TypeScript rewrite with strict type safety and tsup production bundles
  • Reactive ownership architecture auto-disposes stale dependencies, keeping memory flat at ~2.5MB
  • New mount/cleanup lifecycle hooks and improved SPA routing with native 404 fallback

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