fix(build): revert to 5.4.x build output for CJS & add configurable s…

[jasonaden]

…upport for ESM

I had attempted to make a fully non-breaking change where we resolve modules through a package.json file (one package.json file for every module distributed). As it turns out, this doesn't work due to differences between case sensitive and insensitive file systems (and TypeScript configuration options to make case insensitive file systems resolve files with case sensitivity).

This PR makes the basic output the same as it was previously. But it adds distribution of ESM5 and ESM2015 build artifacts. It also dynamically generates a file that can be imported and used in Webpack to resolve to the ESM distribution.

Usage looks like this:

// webpack.config.js

const path = require('path');
const rxPaths = require('rxjs/_esm5/path-mapping');

var config = {
  resolve: {
    alias: rxPaths(path.resolve(__dirname, 'node_modules'))
  }
}

[rxjs-bot]

	Messages
📖

CJS: 1341.6KB, global: 739.6KB (gzipped: 138.7KB), min: 146.0KB (gzipped: 31.2KB)

Generated by 🚫 dangerJS

[coveralls]

Coverage remained the same at 97.477% when pulling b44c06c on jasonaden:revert_package_changes into e8d8c08 on ReactiveX:master.

[benlesh]

This should close #2876

[lock]

This thread has been automatically locked since there has not been any recent activity after it was closed. Please open a new issue for related bugs.