bigape/src/util.js

an bigpipe inpired node structure based on express

/**
 * @desc: util
 * @authors: Yex
 * @date: 2016-10-24 20:45:02
 */

var util = {
  isPromise: function(fn) {
    return fn && typeof fn.then !== 'undefined';
  },

  /**
   * extend
   * @param  {Object} props  子类属性
   *                 constructor: 构造器属性
   *                 static: 静态属性
   * @return {Object}        子类
   */
  extend: function(props) {
    var parent = this;
    var child;

    if (props && props.hasOwnProperty('constructor')) {
      child = function() {
        parent.apply(this, arguments);
        props.constructor.apply(this, arguments);
      };

      //delete props.constructor;
    } else {
      child = function() {
        return parent.apply(this, arguments);
      };
    }

    // staticProps
    Object.assign(child, parent);
    if (props && props.hasOwnProperty('static')) {
      Object.assign(child, props.static);
      delete props.static;
    }

    // extend
    child.prototype = Object.create(this.prototype);

    // child props
    if (props) {
      Object.assign(child.prototype, props);
    }

    // inject props
    // injectChild(child);

    child.__super__ = parent.prototype;

    return child;
  }
};

module.exports = util;