name: CI

on:
  push:
    branches: [main]
  pull_request:

permissions:
  contents: read

jobs:
  build:
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@v4

      - uses: actions/setup-node@v4
        with:
          node-version: 20
          cache: npm

      - run: npm ci

      # The build's `prebuild` step fetches a data snapshot from PokéAPI.
      # Cache it so only the first run (or a change to the script) pays that
      # cost; CI only needs *a* snapshot to prove the build compiles.
      - name: Cache PokéAPI snapshot
        uses: actions/cache@v4
        with:
          path: src/data/snapshot.json
          key: pokeapi-snapshot-${{ hashFiles('scripts/build-snapshot.mjs') }}

      - run: npm run build