[Feature]: Support moment-locales-webpack-plugin

[SyMind]

What problem does this feature solve?

Easily remove unused Moment.js locales when building with webpack.

https://www.npmjs.com/package/moment-locales-webpack-plugin

What does the proposed API of configuration look like?

const MomentLocalesPlugin = require('moment-locales-webpack-plugin');

module.exports = {
    plugins: [
        // To strip all locales except “en”
        new MomentLocalesPlugin(),
 
        // Or: To strip all locales except “en”, “es-us” and “ru”
        // (“en” is built into Moment and can’t be removed)
        new MomentLocalesPlugin({
            localesToKeep: ['es-us', 'ru'],
        }),
    ],
};

[escaton]

This actually enables ContextReplacementPlugin which is indicated as Unsupported yet here 🎉 Great work!

[obennett-m]

This actually enables ContextReplacementPlugin which is indicated as Unsupported yet here 🎉 Great work!

It doesn't based on my testing. The below still fails :-(

const rspack = require('@rspack/core')
...

  plugins: [
    new rspack.ContextReplacementPlugin(/moment[\/\\]locale$/, /(da|de|fr|es|en|it|nl|pt|sv)$/),
  ],
...

[escaton]

Works for me: new webpack.ContextReplacementPlugin

[obennett-m]

Works for me: new webpack.ContextReplacementPlugin

It seems you still have webpack installed in your project. If you use the same require line: const rspack = require('@rspack/core') what happens then?
Here are the version I'm using btw:

    "@rspack/cli": "^0.7.5",
    "@rspack/core": "^0.7.5",

with the error:

rspack --config rspack/build-dev.config.babel.mjs --watch
(node:1357) ExperimentalWarning: Importing JSON modules is an experimental feature and might change at any time
(Use `node --trace-warnings ...` to show where the warning was created)
TypeError: rspack.ContextReplacementPlugin is not a constructor

Which makes sense to me as I didn't see any code for a ContextReplacementPlugin in this PR.

[escaton]

If you look under the hood of moment-locales-webpack-plugin it uses webpack.ContextReplacementPlugin. it doesn't mean that the whole webpack is used there. Just one of its built-in plugins works thanks for the changes in this PR.

[obennett-m]

If you look under the hood of moment-locales-webpack-plugin it uses webpack.ContextReplacementPlugin. it doesn't mean that the whole webpack is used there. Just one of its built-in plugins works thanks for the changes in this PR.

I did look under the hood when I didn't get this working with only @rspack/core installed. This is how I know webpack needs to still be installed in order for this to work. rspack isn't providing ContextReplacementPlugin, so what is documented at https://www.rspack.dev/plugins/webpack/index is still correct.

If you were to completely uninstall webpack from your project you would see the same issues I do.
TypeError: rspack.ContextReplacementPlugin is not a constructor means it is not implemented in @rspack/core.