@hsui/micro-app/lib/sandbox/common.js

Hundsun micro-app framework

/**
 * @author Kuitos
 * @since 2020-04-13
 */
import { isBoundedFunction, isCallable, isConstructable } from '../utils';
// Get native global window with a sandbox disgusted way, thus we could share it between qiankun instances🤪
// eslint-disable-next-line no-new-func
var nativeGlobal = new Function('return this')();
Object.defineProperty(nativeGlobal, '__currentRunningSandboxProxy__', {
  enumerable: false,
  writable: true
});
export function getCurrentRunningSandboxProxy() {
  return nativeGlobal.__currentRunningSandboxProxy__;
}
export function setCurrentRunningSandboxProxy(proxy) {
  // set currentRunningSandboxProxy to global window, as its only use case is for document.createElement from now on, which hijacked by a global way
  nativeGlobal.__currentRunningSandboxProxy__ = proxy;
}
var functionBoundedValueMap = new WeakMap();
export function getTargetValue(target, value) {
  /*
    仅绑定 isCallable && !isBoundedFunction && !isConstructable 的函数对象，如 window.console、window.atob 这类，不然微应用中调用时会抛出 Illegal invocation 异常
    目前没有完美的检测方式，这里通过 prototype 中是否还有可枚举的拓展方法的方式来判断
    @warning 这里不要随意替换成别的判断方式，因为可能触发一些 edge case（比如在 lodash.isFunction 在 iframe 上下文中可能由于调用了 top window 对象触发的安全异常）
   */
  if (isCallable(value) && !isBoundedFunction(value) && !isConstructable(value)) {
    var cachedBoundFunction = functionBoundedValueMap.get(value);
    if (cachedBoundFunction) {
      return cachedBoundFunction;
    }
    var boundValue = Function.prototype.bind.call(value, target);
    // some callable function has custom fields, we need to copy the enumerable props to boundValue. such as moment function.
    // use for..in rather than Object.keys.forEach for performance reason
    // eslint-disable-next-line guard-for-in,no-restricted-syntax
    for (var key in value) {
      boundValue[key] = value[key];
    }
    // copy prototype if bound function not have but target one have
    // as prototype is non-enumerable mostly, we need to copy it from target function manually
    if (value.hasOwnProperty('prototype') && !boundValue.hasOwnProperty('prototype')) {
      // we should not use assignment operator to set boundValue prototype like `boundValue.prototype = value.prototype`
      // as the assignment will also look up prototype chain while it hasn't own prototype property,
      // when the lookup succeed, the assignment will throw an TypeError like `Cannot assign to read only property 'prototype' of function` if its descriptor configured with writable false or just have a getter accessor
      // see https://github.com/umijs/qiankun/issues/1121
      Object.defineProperty(boundValue, 'prototype', {
        value: value.prototype,
        enumerable: false,
        writable: true
      });
    }
    functionBoundedValueMap.set(value, boundValue);
    return boundValue;
  }
  return value;
}
var getterInvocationResultMap = new WeakMap();
export function getProxyPropertyValue(getter) {
  var getterResult = getterInvocationResultMap.get(getter);
  if (!getterResult) {
    var result = getter();
    getterInvocationResultMap.set(getter, result);
    return result;
  }
  return getterResult;
}