Why can't files introduced by require.context() be dynamically updated in Vue? - vue.js

Question

I am building an static markdown blog website using Vue3,and I am using require.context() to load markdown files.
This is the project structure,and I load files from static/posts.
├── dist
│   ├── assets
│   │   └── static
│   │   └── posts
│   │   ├── dev-first-vue3-todolist.md
│   │   ├── dev-fix-missing-xcrun.md
├── package.json
├── src
│   ├── App.vue
│   ├── main.js
├── static
│   └── posts
│   ├── dev-first-vue3-todolist.md
│   ├── dev-fix-missing-xcrun.md
└── vue.config.js
Here's how I load these markdown files.
let context = require.context("../static/posts", true, /\.md$/, "sync");
let keys = context.keys();
// the markdown file list
const postRawList = [];
keys.forEach((key) => {
const raw = context(key).default;
postRawList.push(raw);
});
It worked well. I can read postRawList from static/posts and render them by markdown parser.
The point is, I want my blog website static, so when I build this Vue app I use copy-webpack-plugin to copy these markdown files from static/posts to dist/assets/static/posts and it worked well.
config.plugins.push(
new CopyWebpackPlugin({
patterns: [
{
from: path.resolve(__dirname, "static/posts"),
to: path.resolve(__dirname, "dist/assets/static/posts"),
},
],
})
);
I want to manage my markdown posts only by adding or deleting markdown files in dist/assets/static/posts.
But after I changing the markdown files in dist/assets/static/posts(like delete dev-first-vue3-todolist.md) ,the markdown object list(postRawList) doesn't be updated.
The markdown list is the same as the markdown list in static/posts , and no matter how I change files in this 2 posts folder,it does't be updated.
I guess it is caused by "require cache", and I had tried to delete cache after changing the files, but it did't work.
delete require.cache[context.id];
So I want to know why the file objects not be updated after I built the app and change the files in markdown directory(loaded by require.context()).
This is my first time asking questions on stackoverflow,and I feel sorry if I didn't make it clear.