@ram-stack/composition-root/dist/config-loader.js

Babel macro to define application composition root

const _ = require('lodash');
const dot = require('dot-object');

module.exports = {
  loadConfig,
};

function loadConfig(configPath) {
  return parseConfig(require(configPath));
}

function parseConfig(config) {
  const {plugins, rules, compositionRoots} = dot.object(dot.dot(config));
  return {
    plugins,
    rules: preprocessRules(rules),
    compositionRoots,
  };
}

function preprocessRules(rules) {
  return _.chain(rules)
    .pickBy(rule => !rule.isAbstract)
    .mapValues(rule => {
      while (rule.inherit) {
        rule = extendRule(rule, rules[rule.inherit]);
      }
      return rule;
    })
    .value();
}

function extendRule(rule, parent) {
  return _.merge({},
    _.omit(parent, 'isAbstract'),
    _.omit(rule, 'inherit'),
  );
}