cz-conventional-changelog-befe/lib/memoize.js

cz adaptor for baidu BEFE

'use strict';

/**
 * @file memoize
 * @author Cuttle Cong
 * @date 2018/10/24
 *
 */

var iseq = require('lodash.isequalwith');
var memoize = require('./memfn');

function allowFnEq(a, b) {
  var rlt = iseq(a, b, function (oldV, newV) {
    if (typeof oldV === 'function' && typeof newV === 'function') {
      return oldV.toString() === newV.toString();
    }
  });
  return rlt;
}

module.exports = function (fn) {
  var update = function update() {
    return mfn = memoize(fn, {
      eq: allowFnEq
    });
  };
  var mfn = void 0;
  update();

  function wrapfn() {
    var rlt = void 0;
    try {
      rlt = mfn.apply(this, arguments);
    } catch (err) {
      update();
      throw err;
    }
    if (rlt && typeof rlt.then === 'function') {
      return rlt.catch(function (err) {
        update();
        throw err;
      });
    }
    return rlt;
  }

  var ctx = {
    fn: wrapfn,
    cancel: function cancel() {
      return ctx.fn = fn;
    }
  };
  return ctx;
};