glenjamin/rspack-minify-repro

rspack-repro

• Rspack website
• Rspack repo

A GitHub template for creating a Rspack minimal reproducible example.

Webpack is included for comparing the outputs.

Reproduction Steps

1. npm run build:rspack
2. open rspack-dist/d3.html and rspack-dist/standalone.html
3. Note that in both cases some coordinates are printed to the page
4. npm run build:rspack -- --mode=production
5. Refresh the pages
6. Note that in both cases null is printed to the page

What's happening?

The following construct in the d3 source code

return point = null,
    (lower48Point.point(x, y), point)
    || (alaskaPoint.point(x, y), point)
    || (hawaiiPoint.point(x, y), point);

Is being transpiled/minified to the following in production mode

return (
    e.point(i, u),
    (t = null),
    (n.point(i, u), t) || (o.point(i, u), t)
);

Which is invalid, because the first call to .point() modifies the point var.

versions

    "@rspack/cli": "nightly",
    "webpack-cli": "^5.0.1",
    "webpack": "^5.79.0",

Usages

pnpm run build would both run Webpack and Rspack with config ./config.mjs

• Webpack will emits output in ./webpack-dist
• Rspack will emits output in ./rspack-dist

./webpack-dist and ./rspack-dist are purposely not added to .gitignore. It is recommended to commit these files so we quickly compare the outputs.