blueprint-firebase-scaffold git:20260925.6ec9326A

Immutable. This exact content never changes and is served at /api/v1/blob/96e080fc7ea32e26.

---
name: blueprint-firebase-scaffold
description: "Create the app skeleton: web app, Cloud Functions workspace, emulator config and the rules test harness."
---

# App skeleton

1. Web app: Vite + TypeScript (Vue unless the spec says otherwise). Use `yarn`.
2. `firebase init` for Hosting, Firestore, Functions (TypeScript) and Emulators (Auth, Firestore, Functions,
   Hosting). Copy `infra/firestore.rules`, `infra/firestore.indexes.json` and `infra/firebase.json` from the base
   pack over what init wrote, then merge in anything init generated that they lack.
3. Test harness for rules and functions: `test/blueprint/` with vitest and `@firebase/rules-unit-testing`.
   Every later step adds its own `test/blueprint/<name>.spec.ts`; `checks/emulator-test.sh <name>` runs exactly
   that file against the emulators under the `demo-blueprint` project id, so tests can never touch a real project.
4. `yarn build` must succeed.

Done when the check passes: `firebase.json` configures the emulators, `functions/` exists, `@firebase/rules-unit-testing`
is a dev dependency, `test/blueprint/` exists and `yarn build` succeeds.

## Always

- Read `.blueprint/spec.md` first. It is the agreed specification; do not widen it.
- When you need a decision, ask it through the blueprint question tool and stop. Do not guess.
- Never enable billing, deploy to production, delete data or handle a credential unless this step's gates say the
  user approved exactly that.
- Say you are done by stopping; the executor runs the check. Do not claim success yourself.