parcel-bundler/src/packagers/index.js

<p align="center"> <a href="https://parceljs.org/" target="_blank"> <img alt="Parcel" src="https://user-images.githubusercontent.com/19409/31321658-f6aed0f2-ac3d-11e7-8100-1587e676e0ec.png" width="749"> </a> </p>

const JSPackager = require('./JSPackager');
const CSSPackager = require('./CSSPackager');
const HTMLPackager = require('./HTMLPackager');
const RawPackager = require('./RawPackager');

class PackagerRegistry {
  constructor() {
    this.packagers = new Map();

    this.add('js', JSPackager);
    this.add('css', CSSPackager);
    this.add('html', HTMLPackager);
  }

  add(type, packager) {
    if (typeof packager === 'string') {
      packager = require(packager);
    }

    this.packagers.set(type, packager);
  }

  get(type) {
    return this.packagers.get(type) || RawPackager;
  }
}

module.exports = PackagerRegistry;