Merge pull request #6810 from backstage/timbonicus/webpack5-buffer

webpack5: Add Buffer polyfill

.changeset/ninety-ducks-relate.md

@@ -0,0 +1,5 @@
+---
+'@backstage/cli': patch
+---
+
+Add Buffer to `ProvidePlugin` since this is no longer provided in `webpack@5`

packages/cli/package.json

@@ -56,6 +56,7 @@
     "@yarnpkg/lockfile": "^1.1.0",
     "babel-plugin-dynamic-import-node": "^2.3.3",
     "bfj": "^7.0.2",
+    "buffer": "^6.0.3",
     "chalk": "^4.0.0",
     "chokidar": "^3.3.1",
     "commander": "^6.1.0",

packages/cli/src/lib/bundler/config.ts

@@ -119,6 +119,7 @@ export async function createConfig(
   plugins.push(
     new ProvidePlugin({
       process: 'process/browser',
+      Buffer: ['buffer', 'Buffer'],
     }),
   );