index.js

import { dirname, resolve, basename } from 'node:path';
import { fileURLToPath } from 'node:url';
import { promisify } from 'node:util';

import globber from 'glob';
import lodash from 'lodash';

const promisedGlob = promisify(globber);

export default async function importer(url, options = {}) {
  const results = {};
  const promises = [];
  const path = fileURLToPath(url);
  const root = dirname(path);
  const caller = basename(path);
  const {
    glob = promisedGlob,
    extensions = ['.mjs', '.cjs', '.js'],
    exclude = [],
    template = (exts) => `**/*{${exts.join(',')}}`,
    collector = (mod) => mod.default
  } = options;
  const pattern = await template(extensions);
  const files = await glob(pattern, { cwd: root });
  for (const file of files) {
    if (file !== caller && !exclude?.includes(file))
      promises.push(add(root, file, results, collector));
  }
  await Promise.all(promises);
  return results;
}

export function locationToPath(location) {
  return location.substring(0, location.lastIndexOf('.')).split('/');
}

export async function add(root, file, results, collector) {
  const props = locationToPath(file);
  const result = await import(resolve(root, file));
  lodash.set(results, props, collector(result));
}