ReferenceError: Buffer is not defined

[tomatoboy]

when i use gray-matter in vite react project, found this error:

react_devtools_backend.js:3973 ReferenceError: Buffer is not defined
    at Object.exports2.toBuffer (utils.js:36:38)
    at module2.exports (to-file.js:28:36)
    at matter (index.js:34:14)
    at getFile (Docs.jsx:154:17)

how to fix

[tomatoboy]

Install this library

yarn add @esbuild-plugins/node-globals-polyfill

add this import to your vite.config.js

and add this in your vite.config.js

import { NodeGlobalsPolyfillPlugin } from '@esbuild-plugins/node-globals-polyfill'
export default defineConfig({
    // ...other config settings
    optimizeDeps: {
        esbuildOptions: {
            // Node.js global to browser globalThis
            define: {
                global: 'globalThis'
            },
            // Enable esbuild polyfill plugins
            plugins: [
                NodeGlobalsPolyfillPlugin({
                    buffer: true
                })
            ]
        }
    }
}

[Teemu Koivisto]

Wow rarely I find solutions that work straight away, thanks @tomatobybike !

[Segev Finer]

Would be nicer if this library was compatible with the browser to begin with, or add a browser build defined in the package.json

[Segev Finer]

It seems optimizeDeps isn't run on vite build...

[Andrew See]

vite-plugin-node-polyfills should solve both dev/build problem.
See: https://www.npmjs.com/package/vite-plugin-node-polyfills