extensions option not passed to parser

[garthenweb]

🐛 bug report

I tried to override an asset via extensions options. It did not work because the options passed to the Parser are normalized before, and losing this information. See https://github.com/parcel-bundler/parcel/blob/master/packages/core/parcel-bundler/src/Bundler.js#L36

Maybe this is intended and not a bug, I expeted this to work. Let me know your thoughts.

🎛 Configuration (.babelrc, package.json, cli command)

const bundler = new Bundler('index.html', {
  extensions: {
    '.js': JSAsset,
    '.jsx': JSAsset,
    '.es6': JSAsset,
    '.jsm': JSAsset,
    '.mjs': JSAsset,
  }
})

🤔 Expected Behavior

Should allow overriding the Asset via extensions option.

😯 Current Behavior

Does not override the asset but uses the default asset.

💁 Possible Solution

For now, the following works as expected. But looks like I am using private functions now.

bundler.parser.registerExtension('js', JSAsset)
bundler.parser.registerExtension('jsx', JSAsset)
bundler.parser.registerExtension('es6', JSAsset)
bundler.parser.registerExtension('jsm', JSAsset)
bundler.parser.registerExtension('mjs', JSAsset)

I guess it would be possible to just return extensions from the normalizeOptions call.

🔦 Context

I try to unblock myself and fix #2583 locally for parcel v1.11.

💻 Code Sample

See the configuration section.

🌍 Your Environment

Software	Version(s)
Parcel	1.11
Node	10.14.2
npm/Yarn	6.5.0/ 1.12.3
Operating System	Windows (WSL)

[garthenweb]

Small update about the bundler.parser.registerExtension: Looks like its not working. Sometimes the registered file is used, sometimes not.

[garthenweb]

Closing as v2 will have a different api for things like this.