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htmlifier

The HTMLifier "converts" Scratch 3.0 projects to an HTML file by putting all the project data and the entire Scratch engine into one enormous file.

It does this by making Scratch VM fetch a project, and in doing so, it tracks the assets it fetches from the project.json. It converts the fetched assets and project.json into a base64 data URI. It also fetches the code for the Scratch VM. It inserts all this in a template HTML file, which has been set up to load the project from the base64 data URIs and do other things that the Scratch VM doesn't take of, which is normally handled by scratch-gui, such as variable/list monitors and ask and wait prompts.

The HTMLifier is also available as an npm package.

Credits

CSS by Mr. Cringe Kid.

The Scratch engine is from scratch-vm.

JSZip for downloading as a zip.

See also

The Scratch mod used by the HTMLifier: E羊icques (Github).

Depending on your use case, the HTMLifier may not be the best option for you. The HTMLifier prioritizes accuracy by using almost the same engine that vanilla Scratch uses, sacrificing speed and editability.

Scratch to JavaScript compilers (best for speed): Phosphorus (Scratch 2.0), Forkphorus (3.0), and TurboWarp (3.0).

Scratch to JavaScript converter (best for learning JavaScript): Leopard

Development

If modifying the files in src/, you'll have to re-bundle everything.

# Build once
deno run --allow-run --allow-read=src --allow-write=index.bundle.min.js \
  --allow-net=sheeptester.github.io bin/build.ts

# Automatically build when the files change (for development)
nodemon --exec "deno run --allow-all" --watch src --watch client \
  --ext ts,css,html,js bin/build.ts -- dev

# Build for Node
deno run --allow-run --allow-read=src --allow-write=node/index.min.js \
  --allow-net=sheeptester.github.io bin/build.ts node