gofigure/lib/processor/mixin.js

Configuration library for node

const _ = require('lodash');

const mergeMixin = (originalConfig, env, defaultEnv, nodeType) => {
  const mixin = originalConfig.__mixin__ || {};
  if (!mixin) {
    return originalConfig;
  }
  if (!env) {
    return originalConfig;
  }
  const config = {};
  if (_.has(originalConfig, defaultEnv)) {
    _.set(config, defaultEnv, _.merge({}, mixin, originalConfig[defaultEnv]));
  }
  if (_.has(originalConfig, env)) {
    _.set(config, env, _.merge({}, mixin, originalConfig[env]));
  }
  if (_.has(originalConfig, `type.${env}.${nodeType}`)) {
    const nodeTypeEnvPath = `type.${env}.${nodeType}`;
    const nodeTypeConfig = _.get(originalConfig, `type.${env}.${nodeType}`);
    _.set(config, nodeTypeEnvPath, _.merge({}, mixin, nodeTypeConfig));
  }
  return config;
};

const mixin = (config, opts) => {
  const options = opts || {};
  const defaultEnvironment = options.defaultEnvironment || null;
  const environment = options.environment || null;
  const nodeType = options.nodeType || null;
  return mergeMixin(config, environment, defaultEnvironment, nodeType);
};

module.exports = mixin;