GitHub Action to check if all public npm packages in a pnpm workspace exist on npm before publishing.

Useful for npm Trusted Publishing workflows where packages must already exist on npm before the first publish.

- name: Check if packages exist on npm
  uses: directus/npm-package-existence-checker@v1
  with:
    # Optional: Root directory to check (defaults to current directory)
    directory: '.'

1. Checks the root package.json (if public)
2. Looks for pnpm-workspace.yaml
3. Identify all workspace packages
4. Checks if each non-private package exists on npm
5. Fails if any packages are missing

name: Release

on:
  release:
    types: [published]

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

      - name: Check packages exist
        uses: directus/npm-package-existence-checker@v1

  publish:
    needs: check-packages
    runs-on: ubuntu-latest
    steps:
      # ... your publish steps

1. Install dependencies:

   pnpm install

2. Create a .env file (required for local testing):

   cp .env.example .env

Run unit tests:

pnpm test

Test the action locally using the dev script.

Test against the current repository:

pnpm dev

Test against a different project directory:

INPUT_DIRECTORY=../path/to/other/project pnpm dev

Build for distribution:

pnpm build