viewding/vuejs-core forked from vuejs/core, forked 之后，仅保留了packages下的两个包：reactivity和shared。
虽然vue提供了单独使用reactivity的包：@vue/reactivity。但是，在viewding中不打算使用computed和ref的功能，所以，fork出来，专门定制一个仅包含更少功能的版本。
在viewding/vuejs-core/packages/reactivity目录下执行下述命令打包：
pnpm install
rollup -c rollup.config.mjs
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