alias.config.js

const resolve = require('path').resolve;
const fs = require('fs');

const ROOT = resolve(__dirname, '.');
const MODULES_ROOT = resolve(ROOT, 'modules');

const AliasConfig = modulesDir => {
  const mdir = modulesDir || MODULES_ROOT;
  // this function looks into all packages under ./src and creates alias for local dev
  // {@mlvis/some-package: './modules/some-package/src'}
  return () =>
    fs.readdirSync(mdir).reduce((aliasMap, pkg) => {
      // src/some-package
      const packagePath = resolve(mdir, pkg);
      if (!fs.lstatSync(packagePath).isDirectory()) {
        return aliasMap;
      }
      // packages/some-package/package.json
      const packageJsonPath = resolve(packagePath, 'package.json');
      // bypass alias mapping if no package.json exists
      if (!fs.existsSync(packageJsonPath)) {
        return aliasMap;
      }
      const packageInfo = require(packageJsonPath);
      // @mlvis/some-package => some-package
      const packageName = packageInfo.name.replace(/^(@mlvis\/)/, '');
      aliasMap[packageInfo.name] = resolve(mdir, packageName, 'src');
      return aliasMap;
    }, {});
};
module.exports = AliasConfig(MODULES_ROOT);
module.exports.AliasConfig = AliasConfig;