Publish npm

GitHub Actions — Auto-publish npm package on Release

Canonical implementation: phucbm/publish-npm-action — a composite action that handles install → test → build → version sync → commit artifacts → publish.

Two auth methods

Method	Secret needed	Provenance
npm token	NPM_TOKEN in repo secrets	No
OIDC trusted publishing	None	Auto (attestations)

OIDC is preferred — no long-lived secret, short-lived job-scoped token.

Minimal workflow — npm token

name: Publish on Release

on:
  release:
    types: [published]
  workflow_dispatch:

permissions:
  contents: write

jobs:
  publish:
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@v6
        with:
          ref: main
          token: ${{ secrets.GITHUB_TOKEN }}
          fetch-depth: 0

      - uses: phucbm/publish-npm-action@v1
        with:
          npm-token: ${{ secrets.NPM_TOKEN }}

Minimal workflow — OIDC (no token)

name: Publish on Release

on:
  release:
    types: [published]
  workflow_dispatch:

permissions:
  contents: write
  id-token: write

jobs:
  publish:
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@v6
        with:
          ref: main
          token: ${{ secrets.GITHUB_TOKEN }}
          fetch-depth: 0

      - uses: phucbm/publish-npm-action@v1
        # no npm-token — OIDC is used automatically

One-time npmjs.com setup for OIDC:

1. Go to your package on npmjs.com → Settings → Trusted Publishers
2. Click GitHub Actions, enter: org/user, repo name, workflow filename, environment (leave blank if none)

What the action does

1. Setup pnpm + Node.js (configures registry-url for auth)
2. Install dependencies
3. Auto-detect and run tests (skips gracefully if no test script)
4. Extract version from release tag (v1.2.3 → 1.2.3)
5. npm version <ver> --no-git-tag-version --allow-same-version
6. Run build command
7. Commit package.json + output-dir (force-added) back to main
8. Publish to npm

Inputs

Input	Default	Notes
npm-token	``	Leave empty to use OIDC
node-version	20
pnpm-version	8
build-command	pnpm build	Set '' to skip build
install-command	pnpm install --no-frozen-lockfile
test-command	pnpm test
publish-access	public
skip-tests	false
output-dir	dist/	Force-committed even if in .gitignore
target-branch	main	Branch artifacts are pushed to
commit-files	``	Extra files/patterns to commit

Outputs

package-name, version, npm-url, tests-run

Critical gotchas (learned the hard way)

• Checkout ref: main, not the tag. The action commits build artifacts back — checking out the tag leaves you in detached HEAD and the push fails.
• fetch-depth: 0 is required. When triggered by workflow_dispatch, the action calls gh release list to find the version. Shallow clone breaks this.
• OIDC and NODE_AUTH_TOKEN conflict. setup-node with registry-url writes an .npmrc that sets _authToken=${NODE_AUTH_TOKEN}. If NODE_AUTH_TOKEN is empty, npm falls back to OIDC — but only if you don't set the env var at all. Never pass an empty NODE_AUTH_TOKEN in the OIDC path.
• npm >= 11.5.1 required for OIDC. The action runs npm install -g npm@latest before publishing via OIDC. GitHub-hosted runners ship with an older npm that doesn't support trusted publishing.
• actions/checkout@v6 + actions/setup-node@v6. The npm OIDC guide specifies these versions; older versions don't wire OIDC correctly.
• --allow-same-version prevents errors when package.json already has the release version (e.g. you pre-bumped it manually).
• Build artifacts in .gitignore. The dist/ commit step uses git add --force — without it, ignored build output is silently skipped and the publish has stale files.

References

• npm Trusted Publishers — official docs
• npm trusted publishing with OIDC is generally available — GitHub Changelog, July 2025
• Feature discussion: Publish packages to npm via OIDC — GitHub Community