Possibility change filesystem optionaly in ChunkExtractor

[furryablack]

🚀 Feature Proposal

At now ChunkExtractor uses default node fs package:

// @loadable/server/lib/ChunkExtractor.js
var _fs = _interopRequireDefault(require("fs"));

In development mode with ssr server (aka express) i'm using MFS (memory-fs), but ChunkExtractor knows nothing about it.

What do i think (generalized code parts):

  let loadableServerStats;
  let loadablClientStats;

  ...

  /*
    Server config factory
   */

  const serverConfigCompiler = webpack(serverConfigFactory);

  const mfs = new MFS();

  serverConfigCompiler.outputFileSystem = mfs;

  serverConfigCompiler.watch({}, (err, stats) => {
    if (err) {
      throw err;
    }

    stats = stats.toJson();

    if (stats.errors.length) {
      return;
    }

    loadableServerStats = JSON.parse(readFile(
      mfs,
      loadableServerStatsFilename,
      serverConfigFactory,
    ));
    
    /*
       As example, for client side its will be devMiddleware.fileSystem
       (const devMiddleware = require('webpack-dev-middleware')(clientConfigCompiler))       
    */
    update(mfs);
  });

  ...

  const update = (fsSource) => {
    if (loadableServerStats && loadableClientStats) {
      ready();
      /*
         cb works with ChunkExtractor already
      */
      cb({
        template,
        loadableClientStats,
        loadableServerStats,
        mountId,
        fsSource,
      });
    }
  };

  ...

  createExtractor(stats, fsSource) {
      // at here i want say to extractor "use this source"
      return new ChunkExtractor({ fsSource, stats, entrypoints: this.getEntrypoints() });
   },

Motivation

Makes faster development process

Example

See higher pls

Pitch

We give the opportunity to specify a different fs (mfs) for loading assets.

[gregberge]

Hello @furryablack, good idea, I implement it.

[furryablack]

Wow, so fast =) Thanks a lot