Buffer not found in static build using sveltekit and Torus library

还没有人认领这个 Issue。

I need a way to alias Buffer for the browser.

Not sure which module requires this but its probably crypto related.

```
500

Buffer is not defined

@http://localhost:3000/_app/pages/index.svelte-2478ade3.js:1:111754

```

Problem is using Torus node library.

Here is a repo: https://github.com/ralyodio/torus-bufer

```
npm i
npm run build
npm run preview
```

...you will see error. `npm run dev` works fine since node handles requests. Its the browser only environment that is the issue.

The polyfill in `svelte.config.js` appears to not work: https://github.com/ralyodio/torus-bufer/blob/master/svelte.config.js

使用 npm i、npm run build 和 npm run preview 重现链接的 torus-bufer 仓库中的故障。先阅读 svelte.config.js，并将静态预览与 npm run dev 进行比较；当浏览器构建运行时不再出现 Buffer is not defined 错误时，即表示完成。

由索引模型根据 Issue 内容生成。