me-module-utils/lib/env.js

Me Module utils

"use strict";

Object.defineProperty(exports, "__esModule", {
  value: true
});
exports.default = env;

var _path = require("path");

var _browserEnv = _interopRequireDefault(require("browser-env"));

var _meFactory = require("./meFactory");

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

/**
 * Mock browser environment
 *
 * @param {Object} options 配置
 * @param {string} options.basePath 前端脚本根路径
 * @returns {restorePolyfill}
 */
function env({
  basePath
}) {
  const resolve = p => (0, _path.join)(basePath, p); // 初始化之前，重置 `me.js` 状态
  // 主要是重置 `me._modules`, 保存了上一次解析的模块依赖关系


  global.me = (0, _meFactory.createEmptyMe)(); // 删除缓存，重新加载me loader

  delete require.cache[resolve('lib/me.js')];
  delete require.cache[resolve('lib/me.ext.js')];
  delete require.cache[resolve('lib/require.js')];
  delete require.cache[resolve('lib/merge_require.js')];
  delete require.cache[resolve('app/app.js')]; // Polyfill browser env

  (0, _browserEnv.default)(); // `me.js` 加载过程中，`<header>` 中需要一个 `<script>` 标签

  const script = document.createElement('script');
  script.setAttribute('version', '1.0');
  document.head.appendChild(script);
  const restorePolyfill = backupMePolyfill(); // 加载 `me.js`

  require(resolve('lib/me.js'));

  require(resolve('lib/me.ext.js'));

  require(resolve('lib/require.js'));

  require(resolve('lib/merge_require.js'));

  require(resolve('app/app.js'));

  restorePolyfill();
}
/**
 * Backup `me.js` polyfill
 *
 * @returns {restorePolyfill}
 */


function backupMePolyfill() {
  const bind = Function.prototype.bind;
  return function restorePolyfill() {
    Function.prototype.bind = bind;
  };
}