trails/.github/workflows/dependabot-dedupe.yml
Ullrich Schäfer f085b78fd7
Auto-dedupe lockfile on dependabot PRs
pnpm install after a dependabot bump keeps duplicate versions of
packages that happen to be pinned via overlapping semver ranges. For
singleton-ish libraries (i18next, react-i18next) that's a latent bug:
the server's module instance and the client's module instance each
hold their own state, and SSR output doesn't match CSR.

#272 ran into this with an i18next patch bump — the bumped version
stayed on some dep paths while other paths kept the old version. A
manual `pnpm dedupe` collapsed them and hydration worked again.

This workflow fires on every dependabot PR, runs `pnpm dedupe`, and
pushes the resulting lockfile update back to the PR branch so CI
runs against the deduped tree.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
2026-04-19 11:59:33 +02:00

50 lines
1.7 KiB
YAML

name: Dependabot dedupe
# Dependabot opens a PR after a bump, but `pnpm install` alone doesn't
# dedupe peer copies of packages (e.g. two versions of i18next, each
# holding their own singleton state). That split caused a hydration
# mismatch on #272 until a manual `pnpm dedupe` collapsed them.
#
# This workflow fires on every dependabot PR, runs `pnpm dedupe`, and
# pushes the resulting lockfile update back to the PR branch so the
# subsequent CI run tests the deduped tree.
on:
pull_request:
branches: [main]
permissions:
contents: write
jobs:
dedupe:
if: github.actor == 'dependabot[bot]'
runs-on: ubuntu-latest
steps:
- uses: actions/checkout@v6
with:
ref: ${{ github.head_ref }}
# Use a PAT-like token so the follow-up push re-triggers CI
# (pushes made with GITHUB_TOKEN do not trigger workflow runs).
# Falls back to GITHUB_TOKEN in environments that don't have
# the PAT configured — still pushes, just without re-running CI.
token: ${{ secrets.DEPENDABOT_DEDUPE_TOKEN || secrets.GITHUB_TOKEN }}
- uses: pnpm/action-setup@v6
- uses: actions/setup-node@v6
with:
node-version: 24
cache: pnpm
- run: pnpm install --frozen-lockfile=false
- run: pnpm dedupe
- name: Commit dedupe changes
run: |
if [ -n "$(git status --porcelain pnpm-lock.yaml)" ]; then
git config user.name "dependabot[bot]"
git config user.email "49699333+dependabot[bot]@users.noreply.github.com"
git add pnpm-lock.yaml
git commit -m "pnpm dedupe"
git push
echo "Deduped lockfile pushed."
else
echo "Lockfile already deduped."
fi