Parcel

import {Transformer} from '@parcel/plugin';

export default new Transformer({
  async transform({asset}) {
    let source = asset.getCode();
    let sourceMap = asset.getMap();

    let {code, map} = compile(source, sourceMap);
    asset.setCode(code, map);
  }
});

import {Resolver} from '@parcel/plugin';
import path from 'path';

export default new Resolver({
  async resolve({specifier}) {
    if (specifier === 'special-module') {
      return {
        filePath: path.join(__dirname, 'special-module.js'),
        code: 'export default "This is a special module!";'
      };
    }
  }
});

import {Namer} from '@parcel/plugin';
import path from 'path';

export default new Namer({
  name({bundle}) {
    if (bundle.type === 'png' || bundle.type === 'jpg') {
      let filePath = bundle.getMainEntry().filePath;
      return `images/${path.basename(filePath)`;
    }
  }
});

import {Optimizer} from '@parcel/plugin';

export default new Optimizer({
  async optimize({contents, map}) {
    let {code, sourceMap} = optimize(contents, map);
    return {
      contents: code,
      map: sourceMap
    };
  }
});

import {Reporter} from '@parcel/plugin';

export default new Reporter({
  buildSuccess({event}) {
    let bundles = event.bundleGraph.getBundles();
    console.log(`✨ Built ${bundles.length} bundles in ${event.buildTime}ms!`);
  }
});