60 lines
2.6 KiB
TypeScript
60 lines
2.6 KiB
TypeScript
/**
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* @author Kuitos
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* @since 2020-04-13
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*/
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import { isBoundedFunction, isCallable, isConstructable } from '../utils';
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let currentRunningSandboxProxy: WindowProxy | null;
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export function getCurrentRunningSandboxProxy() {
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return currentRunningSandboxProxy;
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}
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export function setCurrentRunningSandboxProxy(proxy: WindowProxy | null) {
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currentRunningSandboxProxy = proxy;
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}
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export function getTargetValue(target: any, value: any): any {
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/*
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仅绑定 isCallable && !isBoundedFunction && !isConstructable 的函数对象，如 window.console、window.atob 这类。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
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@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）
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*/
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if (isCallable(value) && !isBoundedFunction(value) && !isConstructable(value)) {
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const boundValue = Function.prototype.bind.call(value, target);
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// some callable function has custom fields, we need to copy the enumerable props to boundValue. such as moment function.
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// use for..in rather than Object.keys.forEach for performance reason
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// eslint-disable-next-line guard-for-in,no-restricted-syntax
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for (const key in value) {
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boundValue[key] = value[key];
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}
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// copy prototype if bound function not have but target one have
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// as prototype is non-enumerable mostly, we need to copy it from target function manually
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if (value.hasOwnProperty('prototype') && !boundValue.hasOwnProperty('prototype')) {
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// we should not use assignment operator to set boundValue prototype like `boundValue.prototype = value.prototype`
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// as the assignment will also look up prototype chain while it hasn't own prototype property,
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// 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
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// see https://github.com/umijs/qiankun/issues/1121
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Object.defineProperty(boundValue, 'prototype', { value: value.prototype, enumerable: false, writable: true });
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}
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return boundValue;
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}
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return value;
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}
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const getterInvocationResultMap = new WeakMap<CallableFunction, any>();
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export function getProxyPropertyValue(getter: CallableFunction) {
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const getterResult = getterInvocationResultMap.get(getter);
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if (!getterResult) {
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const result = getter();
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getterInvocationResultMap.set(getter, result);
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return result;
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}
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return getterResult;
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}
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