How to cache pnpm ?

[seepine]

jobs:
  test:
    runs-on: ubuntu-latest
    env:
      RUNNER_TOOL_CACHE: /toolcache
    steps:
      - name: Checkout
        uses: actions/checkout@v3

      - name: Setup Pnpm
        uses: pnpm/action-setup@v2
        with:
          version: 7.30.0

      - name: Setup Node
        uses: actions/setup-node@v3
        with:
          node-version: 16
          cache: 'pnpm'

      - name: Dependent installation
        run: pnpm i

It download pnpm every time.

[belgattitude]

I tested few approaches.

The one that works for me is in this gist: https://gist.github.com/belgattitude/838b2eba30c324f1f0033a797bab2e31.

It generally gives amost a 2x boost (see benchmarks https://github.com/belgattitude/compare-package-managers)

With cache

CI Scenario	Install	CI fetch cache	Total	Cache size	CI persist cache
yarn4 no compression	26s	2s	28s	155Mb	(±8s)
pnpm8.5.1	16s	9s	25s	253Mb	(±30s)

Without cache

CI Scenario	Install	Diff with cached run
yarn4 no compression / no cache	±45s	< 2x slower
pnpm8 / no cache	±48s	2x slower