How can I use Buffer, process in Vite app?

Question

I'm using wagmi in typescript react app setup by Vite.

I got some issue ex:

"global is not defined", "buffer is not defined"

And I tried it again with some code in main.tsx:

import { Buffer } from 'buffer';
import process from 'process';

window.global = window;
window.Buffer = Buffer;
window.process = process;

But I still get some error ex: "Module "process" has been externalized for browser compatibility. Cannot access "process.versions" in client code."

Error will occur when I connect to coinbase or walletconnect connector.

My vite.config.ts

import { defineConfig } from 'vite';
import react from '@vitejs/plugin-react';
//import Buffer from 'buffer';

// https://vitejs.dev/config/
export default defineConfig({
  plugins: [react()],
  server: {
    port: 5000,
  },
  resolve: {
    alias: [{ find: '@', replacement: '/src' }],
  },
  define: {
    // global: 'window',
    // Buffer: Buffer,
    // process: process,
  },
});

Answer 1

To get buffer and process working, do the following:

1. install buffer and process: npm install buffer process

2. edit index.html to add some js:

<!-- node // buffer-->
<script>window.global = window;</script>
<script type="module">
    import { Buffer } from "buffer/"; // <-- no typo here ("/")
    import process from "process";
   
    window.Buffer = Buffer;
    window.process = process;
</script>

3. edit your vite.config.js to add resolve.alias options:

export default defineConfig({
  [...]

  resolve: {
    alias: {
      process: "process/browser"
    }
  }
})

4. in your component, import buffer (note the /):

import { Buffer } from 'buffer/'

[...]

Live example on stackblitz, open your console devtools on the preview, and look at the Uint8Array debug line.

You can give a read to my old answer for further setup like for process, events or even crypto.