react-stand-in/lib/transferStaticProps.js

'use strict';

exports.__esModule = true;

var _extends = Object.assign || function (target) { for (var i = 1; i < arguments.length; i++) { var source = arguments[i]; for (var key in source) { if (Object.prototype.hasOwnProperty.call(source, key)) { target[key] = source[key]; } } } return target; };

var _shallowequal = require('shallowequal');

var _shallowequal2 = _interopRequireDefault(_shallowequal);

var _utils = require('./utils');

var _constants = require('./constants');

function _interopRequireDefault(obj) { return obj && obj.__esModule ? obj : { default: obj }; }

var RESERVED_STATICS = ['length', 'displayName', 'name', 'arguments', 'caller', 'prototype', 'toString', 'valueOf', _constants.PROXY_KEY, _constants.UNWRAP_PROXY];

function transferStaticProps(ProxyComponent, savedDescriptors, PreviousComponent, NextComponent) {
  Object.getOwnPropertyNames(ProxyComponent).forEach(function (key) {
    if (RESERVED_STATICS.indexOf(key) !== -1) {
      return;
    }

    var prevDescriptor = Object.getOwnPropertyDescriptor(ProxyComponent, key);
    var savedDescriptor = savedDescriptors[key];

    if (!(0, _shallowequal2.default)(prevDescriptor, savedDescriptor)) {
      (0, _utils.safeDefineProperty)(NextComponent, key, prevDescriptor);
    }
  });

  // Copy newly defined static methods and properties
  Object.getOwnPropertyNames(NextComponent).forEach(function (key) {
    if (RESERVED_STATICS.indexOf(key) !== -1) {
      return;
    }

    var prevDescriptor = PreviousComponent && Object.getOwnPropertyDescriptor(ProxyComponent, key);
    var savedDescriptor = savedDescriptors[key];

    // Skip redefined descriptors
    if (prevDescriptor && savedDescriptor && !(0, _shallowequal2.default)(savedDescriptor, prevDescriptor)) {
      (0, _utils.safeDefineProperty)(NextComponent, key, prevDescriptor);
      return;
    }

    if (prevDescriptor && !savedDescriptor) {
      (0, _utils.safeDefineProperty)(ProxyComponent, key, prevDescriptor);
      return;
    }

    var nextDescriptor = _extends({}, Object.getOwnPropertyDescriptor(NextComponent, key), {
      configurable: true
    });

    savedDescriptors[key] = nextDescriptor;
    (0, _utils.safeDefineProperty)(ProxyComponent, key, nextDescriptor);
  });

  // Remove static methods and properties that are no longer defined
  Object.getOwnPropertyNames(ProxyComponent).forEach(function (key) {
    if (RESERVED_STATICS.indexOf(key) !== -1) {
      return;
    }
    // Skip statics that exist on the next class
    if (NextComponent.hasOwnProperty(key)) {
      return;
    }
    // Skip non-configurable statics
    var proxyDescriptor = Object.getOwnPropertyDescriptor(ProxyComponent, key);
    if (proxyDescriptor && !proxyDescriptor.configurable) {
      return;
    }

    var prevDescriptor = PreviousComponent && Object.getOwnPropertyDescriptor(PreviousComponent, key);
    var savedDescriptor = savedDescriptors[key];

    // Skip redefined descriptors
    if (prevDescriptor && savedDescriptor && !(0, _shallowequal2.default)(savedDescriptor, prevDescriptor)) {
      return;
    }

    (0, _utils.safeDefineProperty)(ProxyComponent, key, {
      value: undefined
    });
  });

  return savedDescriptors;
}

exports.default = transferStaticProps;