From a Broken Dependabot PR to Building My First CI Dev Tool

How a Broken Dependabot PR Inspired Me to Build "Syncmydep"

I was merging a routine pull request from Dependabot when my GitHub Actions workflow suddenly threw a red build error:

At first, I was confused. Everything looked fine in the PR diff, but after some debugging, I realized what happened: Dependabot had updated my package.json, but package-lock.json failed to sync properly. As a result, npm ci crashed during the CI run due to mismatched lockfile integrity.

After resolving the mismatch manually, I went back to building new features for my TUI Portfolio Website. But midway through coding, a thought hit me:

What if there was an automated tool that detects lockfile drift, syncs package.json with package-lock.json, and opens a pull request automatically?

My first reaction was to brush it off, thinking it might be overly complicated to automate. But curiosity took over. I started researching GitHub Actions workflows, lockfile regeneration commands, and automated branch commits. Turns out, it wasn’t just possible—it was surprisingly clean to build.

A few days of building later, Syncmydep was born. 🚀

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What is Syncmydep?

Syncmydep is an automated GitHub Action designed to eliminate CI crashes caused by out-of-sync dependencies and lockfile drift.

Instead of waiting for npm ci or your build pipeline to fail, Syncmydep detects manifest changes, runs fast lockfile updates, handles vulnerability fixes, and keeps your branch clean.

✨ What It Can Do

• 🔄 Multi-Package Manager Sync: Out-of-the-box support for npm, pnpm, yarn (v1 & Berry v2–v4), bun, and deno.
• 🛡️ Vulnerability Remediation: Runs automated security audit fixes (audit fix) to patch known vulnerabilities.
• 🏢 Monorepo & Ghost Lockfile Cleanup: Detects Turborepo, Nx, Lerna, and pnpm workspaces, and purges rogue nested lockfiles that break hoisting.
• 💬 ChatOps Workflow: Comment syncdep on any open PR to trigger an immediate sync and push directly to that branch.
• 🚦 CI Gating: Run in check-only: true mode to catch out-of-sync manifests before merging.
• 🐳 Multi-Arch Docker Ready: Run anywhere via the official ghcr.io container (amd64 and Apple Silicon arm64).

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Key Takeaways from Building It

• Always challenge your "impossible" ideas: A minor developer friction point you face every day is often shared by thousands of other engineers.
• Automate the manual chores: If a CI workflow fails for a predictable, deterministic reason (like lockfile drift), the fix should be automated too.

💝 Showcase

• 🪅 GitHub Action

My GitHub Action Supports this .

• 🐳 Docker Action Local

This is used for check-only CI verification mode.

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Let's Make It Better Together! 🤝

Syncmydep is open-source, and I'd love your feedback, feature ideas, and contributions.

• Check out the repo on GitHub: Syncmydep
• Check out my Astro-Tui-Portfolio: Click me
• Try it in your workflows, drop a star ⭐ if you find it helpful, or open an issue/PR!

Muah 🤍,

Bye bye .

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