default-args/dist/default-args.esm.js

A simple function for providing defaults to an options argument. No dependencies, tiny amount of code.

/*!
 * default-args v1.0.1 (https://github.com/victornpb/default-args)
 * Copyright (c) victornpb
 * @license MIT
 */
/**
 * Returns the options object deeply merged with the defaults.
 * Extranous properties are not included in the returned object.
 * @param {object} defaults - The object that contains the default values.
 * @param {object|undefined|null} [options] - The object to be merged into defaultObj. (it does not mutate this argument)
 * @returns {object} the merged object.
 *
 * @example
 * function myFunction(options) {
 *   options = defaults({
 *     foo: true,
 *     bar: {
 *       a: 1,
 *       b: 2,
 *     },
 *   }, options);
 *
 *   // do stuff with options
 * }
 */
function defaultArgs(defaults, options) {
  function isObj(x) {
    return x !== null && typeof x === 'object';
  }

  function hasOwn(obj, prop) {
    return Object.prototype.hasOwnProperty.call(obj, prop);
  }

  if (isObj(options)) for (var prop in defaults) {
    if (hasOwn(defaults, prop) && hasOwn(options, prop) && options[prop] !== undefined) {
      if (isObj(defaults[prop])) defaultArgs(defaults[prop], options[prop]);else defaults[prop] = options[prop];
    }
  }
  return defaults;
}

export { defaultArgs as default };
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