transformy.js

// transformy is an object mapping tool to 
// transform objects to another object defaults
function transformy({ mutate = {}, input = {}, schema = {}, omit = [], loose = true }) {
  return Object.keys(input).map((key) => {
    const mutated = {};
    const tkey    = mutate.hasOwnProperty(key) ? mutate[key] : null;
    if (omit.indexOf(key) !== -1) return mutated;
    if (typeof input[key] !== 'undefined' && schema.hasOwnProperty(tkey)) {
      mutated[tkey] = input[key];
    } else if (typeof schema[key] !== 'undefined') { 
      mutated[key] = schema[key]; 
    } else if (loose === true && typeof input[key] !== 'undefined') {
      mutated[key] = input[key];
    }
    return mutated;
  })
  .filter(obj => Object.keys(obj).length)
  .reduce((a, b) => {
    Object.keys(b).forEach(key => a[key] = b[key]);
    return a;
  }, {});
};
// transformy({
//   mutate: {
//     token: 'token',
//     webApp: 'web',
//     isMaster: 'master',
//     registeredActions: 'actions',
//     fullSchemas: 'schemas',
//     owner: 'ownerId',
//     nodeEnv: 'env'
//   },
//   input: {
//     token: 1234,
//     webApp: true,
//     isMaster: true,
//     web: true,
//     registeredActions: ['herro'],
//     schemas: { example: [] },
//     ownerId: 1337,
//     env: 'production',
//     looseKey: 'gotheem',
//     omitKey: 'lessee'
//   },
//   schema: {
//     token: 0,
//     web: false,
//     master: false,
//     actions: [],
//     schemas: {},
//     room: 1,
//     ownerId: 1,
//     env: 'development'
//   },
//   omit: ['omitKey'],
//   loose: true
// });