Use monorepos with App Hosting

With monorepos, you can organize and manage multiple projects in a single directory. This guide describes how to get started deploying Nx-based apps with App Hosting.

Deploy monorepos with the Firebase console

Monorepo support is built into the graphical backend setup flow in the Firebase console. When prompted for a "Root directory" under "Deployment settings," specify the path to the application you want to deploy inside the monorepo:

Deploy monorepos with the Firebase CLI

Monorepo support is built into the backend setup flow invoked by the Firebase CLI command apphosting:backends:create. After you enter this flow and specify your chosen GitHub repository, you are prompted to specify your app's root directory relative to your repository; at this prompt, pass the path to the application you want to deploy inside the monorepo:

$ firebase apphosting:backends:create --project [project-name]
i  === Import a GitHub repository
✔  Connected with GitHub successfully

? Which GitHub repo do you want to deploy? gh-username/nx-monorepo
? Specify your app's root directory relative to your repository path/to/app

For example, here are the assets that would be deployed given the following Nx project structure and "target-app" as the application you want to build and deploy:

.
    ├── lib
    ├── apps
    │   └── target-app
    │       ├── project.json
    │       └── src
    │           └── ...
    ├── nx.json
    ├── package-lock.json
    └── package.json

The app's root directory relative to your repository is apps/target-app.

Troubleshooting monorepo deployment

• If you do not specify the "root directory" field, then the build will fail and display a message that App Hosting cannot find a project to target inside the Nx monorepo.
• For Nx + Angular applications, you must use the Angular application builder to build the application. The Angular application builder is specified in project.json