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

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.

使用 @angular/fire compat storage 重現 Angular 20 遷移，並將新的 builder 與 @angular-devkit/build-angular 進行比較。從所參照的 @angular/fire/compat/storage/index.d.ts 中對 firebase/compat 的 import 以及 builder 遷移輸出開始。遷移後的應用程式能夠在沒有 TS2307 的情況下建置即表示完成。

由索引模型根據 Issue 內容生成。