Files
Mofei Zhang 91452c1b4b [compiler][playground] parse compiler configs using json5
Compiler config parsing is currently done with new Function(...) which is a XSS vulnerability. Replacing this with json parsing for safety reasons.

Almost all compiler options (except for moduleTypeProvider) are json compatible, so this isn't a big change to capabilities. Previously created playground URLs with non-default configs may not be compatible with this change, but we should be able to get the correct config manually (by reading the JS version)
2026-03-30 12:54:14 -04:00
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React Compiler Playground

An interactive playground to demonstrate, test, and have fun with React Compiler.

Setup

# Build React Compiler from source and install Playground dependencies.
$ yarn

# Or similarly
$ npm install

Development

# Start the local development server with
$ yarn dev

# Or
$ npm run dev

# Rerun the following (in a separate terminal window) when React Compiler
# is changed locally to keep Playground in sync.
$ yarn

Testing

# Install playwright browser binaries
$ npx playwright install --with-deps
# Run tests
$ yarn test

Deployment

This project has been deployed using Vercel. Vercel does the exact same thing as we would locally, by running yarn at the install step in the Playground directory to build React Compiler from source and symlink it as its dependency. This means that Playground is automatically deployed on every push and pull requests will reflect the behaviors of React Compiler of that commit.