name: better-setup-node
description: Install a pinned musl Node from the official unofficial-builds (glibc builds cannot exec on musl runners) and optionally activate a pinned pnpm via corepack.
inputs:
  node-version:
    description: Exact Node version to install (e.g. 22.14.0).
    required: true
  pnpm-version:
    description: Optional exact pnpm version to activate via corepack.
    required: false
    default: ""
runs:
  using: composite
  steps:
    - shell: bash
      run: |
        set -euo pipefail
        nv="${{ inputs.node-version }}"
        pv="${{ inputs.pnpm-version }}"
        need_install=0
        node --version 2>/dev/null | grep -q "^v${nv%%.*}\." || need_install=1
        [ "$need_install" = 0 ] && [ -n "$pv" ] && command -v corepack >/dev/null || need_install=1
        if [ "$need_install" = 1 ]; then
          case "$(uname -m)" in
            x86_64|amd64) musl=x64-musl ;;
            aarch64|arm64) musl=arm64-musl ;;
            *) echo "better-setup-node: unsupported arch $(uname -m)" >&2; exit 1 ;;
          esac
          curl -fsSL "https://unofficial-builds.nodejs.org/download/release/v${nv}/node-v${nv}-linux-${musl}.tar.gz" \
            | tar -xz -C /usr/local --strip-components=1
        fi
        node --version
        if [ -n "$pv" ]; then
          corepack enable
          corepack prepare "pnpm@${pv}" --activate
          pnpm --version
        fi