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@saasfe/we-app-sandbox

v1.0.1

Published

we app sandbox

Downloads

2

Readme

微应用沙箱

为微应用提供封闭运行环境的容器。

由两部分构成,

  1. 一个是JS沙箱,提供模拟的window,使用@ice/sandbox;
  2. 一个是UI沙箱,提供模拟的document,基于Shadow DOM。

一般的沙箱,主要会专注于解决JS执行环境的隔离问题,主要在模拟window。JS隔离的几个核心的问题是:全局变量污染、事件监听、定时器等。

但是,对于一个完整的前端应用,除了JS执行环境的隔离,还会样式污染问题,以及由DOM操作带来的副作用(如动态插入元素等)。

样式污染问题,容易想到的解决方案有:CSS Module、Shadow DOM等。

从原理上来说,Shadow DOM提供了天然的样式隔离沙箱。同时,它对与样式对应的HTML也有约束,需要样式、HTML在同一个ShadowRoot中。

HTML的操作,其实就涉及DOM操作了,而元素创建、插入很多与document、document.body相关,所以需要模拟document,否则会出现DOM逃逸。

这样一来,将内容渲染到ShadowDOM里需要对组件库做的修正,就不需要了。因为对于程序来说,整个生命周期都在沙箱里,代码依然在按照自己既定的逻辑执行。