Ember.js simplest asset map bundled with app/ tree - no extra downloads

helpers-asset-map.js

import Helper from '@ember/component/helper';
import { inject as service } from '@ember/service';

export default Helper.extend({
  assetMap: service(),
  compute(params) {
    const [path] = params;
    return this.assetMap.resolve(path);
  }
});

index.js

const writeFile = require('broccoli-file-creator');
const MergeTrees = require('broccoli-merge-trees');
const path = require('path');
const glob = require('glob');

treeForApp(tree) {
    const filesList = glob
      .sync(path.join(this.project.root, 'public/**/*'), { nodir: true })
      .map((filePath) => {
        return filePath.split('public').pop();
      }).reduce((obj, currentPath) => {
        const file = path.parse(currentPath);
        obj[path.join(file.dir, file.name)] = currentPath;
        return obj;
      }, {});

    // Final output:
    // export default { '/assets/some-path/my-image': '/assets/some-path/my-image.jpg' }
    // Which gets asset-rev rewrite to
    // export default { '/assets/some-path/my-image': '/assets/some-path/my-image-<hash>.jpg' }
    return new MergeTrees([tree, writeFile('assetsMap.js', 'export default ' + JSON.stringify(filesList))]);
  }

services-asset-map.js

import Service from '@ember/service';
import { getOwner } from '@ember/application';
import { computed, get } from '@ember/object';
import { assert } from '@ember/debug';

export default Service.extend({
  _assetMap: computed(function() {
    return getOwner(this).factoryFor('assetsMap:main').class;
  }).readOnly(),

  resolve(path) {
    const lastDotIndex = path.lastIndexOf('.');
    assert('asset-map path must end with extension', lastDotIndex > -1); // just to keep usage consistent for better dev experience
    const pathWithoutExtension = path.substring(0, path.lastIndexOf('.'));
    return get(this._assetMap, pathWithoutExtension);
  }
});