How do I use the middleware on a path other than '/' ?

❔ Question

How can I tell the Bundler middleware to serve out of a subdirectory path?

I’d like to serve a Parcel-bundled app as a subdirectory of an Express app. For production I plan on just pointing Nginx to the dist/ folder, but for development I’d like to integrate the Parcel middleware into the main server, with hot-reloading etc. I’ve therefore followed the API docs and attached a new Bundler().middleware() to the existing Express app, and told the Bundler what its public URL is:

app.use('/app/', new Bundler(__dirname+'/../browserclient/src/index.html', {
	publicUrl: '/app/',
}).middleware())

Unfortunately, this just serves the index page for everything under /app/, including the JS and CSS bundles. This appears to be because of https://github.com/parcel-bundler/parcel/blob/0b98eedf2d9cb1a5232329d0d41e36bdef2b87bd/packages/core/parcel-bundler/src/Server.js#L57-L63 which checks if the middleware is serving a known path under options.publicURL. Unfortunately since I’m using app.use(path, ...) the pathname variable is relative to /app/ (that is, it goes /index.deadbeef.js, not /app/index.deadbeef.js) and so never matches, and the bundled code can never be served. If I just tell it to app.use(new Bundler()) then it works, but Parcel also takes over the rest of the server and starts handing out its index instead of 404 pages.

🌍 Your Environment

Software	Version(s)
Parcel	1.12.3
Node	8.9.4
Express	4.13.4

[Kogia-sima]

But this is confusing. It is better if Parcel use req.originalUrl if it is defined, instead of using req.url, with which Parcel cannot detect the middleware is used for root (/) path or another url.

[stale[bot]]

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