RFC: support bundle new URL using parser.javascript.bundleNewUrl

[JSerFeng]

Provide a parser config to bundle URL dependency. For example:

Motivation

const foo = new URL('./foo.ts', import.meta.url)

Current behavior is to treat foo as asset module, and do not transform it at all, leaves the .ts file in output ontouched.

It's very helpful if we make it a unique async entry, so that the ref module can be transformed and bundled by Rspack during the same compilation.

Usage

The one possible config is

module.exports = {
  module: {
    parser: {
      javascript: {
        bundleNewUrl: true
      }
    }
  }
}

Rspack will make an async entry if meet syntax like

const url = new URL('./foo.ts', import.meta.url)

So all dependencies in foo.ts can be bundled into single file, and returns the file path in runtime.

Implementation

Currently JavascriptParser already supports parsing syntax like new URL('./foo', import.meta.url), the syntax will become a URLdependency.

The URL dependency will resolve treat ref module as asset module. We can make it a entry block instead, with entryOptions: { chunkLoading: false }, so that it becomes the single file in the last.

URL dependency can be treated as a entry block. When building chunk graph, all entry block generates an async entrypoint chunkGroup.

We disable its chunkLoading and asyncChunks, so that the ref module results in only 1 file at last.

Using with parser.javascript.url

It can work with parser.javascript.url. If parser.javascript.url equals:

• false: Rspack won't parse new URL syntax at all.
• 'relative' and 'new-url-relative' are 2 ways to render the returned value of new URL.