ivarvong/lantern
Animated, steppable code explainers. Zero-dependency TypeScript, SVG output, browser and Cloudflare Workers.
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README & documentation
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Animated, steppable explainers for code changes. A zero-dependency JS port of manim's core model that renders to SVG: a live DOM in the browser, strings in Cloudflare Workers or Node. Every step is addressable (?scene=&step=), and every scene has a text form and a structured trace for agents. Then: The repo is TypeScript throughout. Node 24 runs the tools and tests as .ts directly (type stripping, so only erasable syntax); tsc compiles the library to dist/. A scene is a class with an async construct(). Steps are markers; this.state is what the explanation is about, and it is what traces record: Register it in scenes/index.ts, then: Diagrams can be text: flowchart(mermaidSource) parses a Mermaid flowchart, lays it out and returns shapes you can animate (docs/FLOWCHART.md). Scenes can also be data: sceneFromDoc(doc) plays a JSON document of nodes, edges, code and ops (docs/DOC-FORMAT.md). Every geometric operation maps a function over the…
Read the full README ↗ · Preview checked 2026-10-29T12:39:28.536Z
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What this repository does
Animated, steppable code explainers. Zero-dependency TypeScript, SVG output, browser and Cloudflare Workers.
Repository facts
- Owner
- ivarvong
- Primary language
- TypeScript
- Stars
- 240
- Forks
- 6
- Open issues + pull requests
- 2
- License
- MIT
- Archived
- No
- Default branch
- main
- Created
- 2026-10-23T22:12:49.000Z
- Last push
- 2026-10-27T13:11:27.000Z
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