Feature Request: Use compiler.outputFileSystem

[mwaldstein]

While less common, I was in a scenario where I wanted to run a development server using a production configuration using webpack-dev-middleware. While native webpack outputs went into its MemoryFS, prerender-spa-plugin still wrote to the native filesystem.

This is a low priority, but it would be nice if the compiler's outputFileSystem were used for writing if set.

References:

• https://webpack.js.org/api/node/#custom-file-systems
• https://github.com/webpack/webpack-dev-middleware/blob/master/lib/fs.js#L56

[JoshTheDerf]

@mwaldstein Hmm, would it be possible to simply replace references to fs with compiler.outputFileSystem? Just curious, as that does seem like a good idea.

[mwaldstein]

I believe so - A rather cursory examination suggests that outputFileSystem has the following interface:

https://github.com/webpack/webpack/blob/eca7bad8de54c39b9cb8b138793362b8a17ac11b/lib/node/NodeOutputFileSystem.js

So I think the changes would be to change the fs.writeFile and mkdirp calls to compiler.outputFileSystem calls...

[JoshTheDerf]

Should be implemented now in 8d1bae9!