@angular/build: TS2307: Cannot find module 'firebase/compat'

[rala72]

I currently have an Angular 20 application with storage.
I tried to migrate to the new builder system and after running the migration script I get:

X [ERROR] TS2307: Cannot find module 'firebase/compat' or its corresponding type declarations. [plugin angular-compiler]

node_modules/.pnpm/@angular+fire@20.0.1_b3d6211399b528bde26c95436c0ed9a1/node_modules/@angular/fire/compat/storage/index.d.ts:9:33:
  9 │ import * as firebase_compat from 'firebase/compat';
    ╵                                  ~~~~~~~~~~~~~~~~~

With @angular-devkit/build-angular it works fine.