action.yml

name: Setup dependencies
description: Detect package manager, setup Node.js, and install dependencies

inputs:
  node-version-file:
    description: File to read Node.js version from
    default: .nvmrc
  node-version:
    description: Explicit Node.js version; takes precedence over node-version-file when set
    required: false
    default: ""
  pnpm-version:
    description: pnpm version to use if pnpm is detected
    default: "9.15.2"

outputs:
  manager:
    description: Detected package manager (pnpm, yarn, or npm)
    value: ${{ steps.detect.outputs.manager }}
  runner:
    description: Command prefix for running scripts
    value: ${{ steps.detect.outputs.runner }}

runs:
  using: composite
  steps:
    - name: Detect package manager
      id: detect
      shell: bash
      run: |
        if [ -f "pnpm-lock.yaml" ]; then
          echo "manager=pnpm" >> $GITHUB_OUTPUT
          echo "command=install --frozen-lockfile" >> $GITHUB_OUTPUT
          echo "runner=pnpm" >> $GITHUB_OUTPUT
        elif [ -f "yarn.lock" ]; then
          echo "manager=yarn" >> $GITHUB_OUTPUT
          echo "command=install --frozen-lockfile" >> $GITHUB_OUTPUT
          echo "runner=yarn" >> $GITHUB_OUTPUT
        else
          echo "manager=npm" >> $GITHUB_OUTPUT
          echo "command=ci" >> $GITHUB_OUTPUT
          echo "runner=npx --no-install" >> $GITHUB_OUTPUT
        fi

    - name: Setup pnpm
      if: steps.detect.outputs.manager == 'pnpm'
      uses: pnpm/action-setup@v4
      with:
        version: ${{ inputs.pnpm-version }}

    - name: Setup Node.js
      uses: actions/setup-node@v4
      with:
        node-version: ${{ inputs.node-version }}
        node-version-file: ${{ inputs.node-version-file }}
        cache: ${{ steps.detect.outputs.manager }}

    - name: Install dependencies
      shell: bash
      run: ${{ steps.detect.outputs.manager }} ${{ steps.detect.outputs.command }}