action.yml

name: Setup Node
description: General setup of node
inputs:
  node-version:
    default: 24
  save-cache:
    description: Whether to save the pnpm store cache on main (still restored either way)
    default: 'true'

runs:
  using: composite
  steps:

    - name: Setup pnpm
      uses: pnpm/action-setup@v5

    - name: Setup Node.js
      uses: actions/setup-node@v6
      with:
        node-version: ${{ inputs.node-version }}

    - name: Get pnpm store path
      id: pnpm-store
      shell: bash
      run: echo "path=$(pnpm store path --silent)" >> "$GITHUB_OUTPUT"

    # Restore-keys fall back to the closest prior store even when the lockfile
    # hash doesn't match exactly, so PRs reuse main's store instead of
    # installing from scratch.
    - name: Restore pnpm store
      uses: actions/cache/restore@v4
      with:
        path: ${{ steps.pnpm-store.outputs.path }}
        key: pnpm-store-${{ runner.os }}-${{ hashFiles('pnpm-lock.yaml') }}
        restore-keys: |
          pnpm-store-${{ runner.os }}-

    - name: Install dependencies
      shell: bash
      run: pnpm install --frozen-lockfile

    # Cache keys are immutable, so every lockfile change saves a brand-new
    # store on top of the previous one and old package versions never get
    # dropped. Pruning here keeps the saved cache scoped to what this
    # lockfile actually needs instead of growing unbounded.
    - name: Prune pnpm store
      shell: bash
      run: pnpm store prune

    # Only main writes new cache entries — PRs restore-and-reuse but never
    # save, so open PRs stop each spawning their own throwaway ~700MB entry.
    - name: Save pnpm store
      if: github.ref == 'refs/heads/main' && inputs.save-cache == 'true'
      uses: actions/cache/save@v4
      with:
        path: ${{ steps.pnpm-store.outputs.path }}
        key: pnpm-store-${{ runner.os }}-${{ hashFiles('pnpm-lock.yaml') }}