File-level attribution
Know that moment landed because of app/page.tsx when you optimize Next.js bundles.
Next.js bundle optimization for Vercel
Optimize Next.js bundle size
before it hits production.
Bundle Cop helps you reduce client JS on Vercel: attribute every kilobyte to the importing file, enforce budgets at build time, and catch regressions on every deploy.
bundle-cop-vercel-pluginv0.1.3
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Vercel optimization that runs in the build
Install the adapter and ship. Bundle Cop parses Next.js build output on Vercel, diffs against production, and highlights the biggest culprit — so performance work is tied to a real file, not a vague chunk name.
pnpm add bundle-cop-vercel-plugin
Built for shipping on Vercel
Attribution, budgets, and deploy reports — without another dashboard to babysit.
Bundle budgets
Warn or fail from bundle-cop.config.json before an oversize merge hits Vercel production.
Deploy reports
Webhook + Checks on every ship so Vercel performance regressions surface in CI.
Common questions
Straight answers for teams searching how to optimize Next.js on Vercel.
How do I optimize Next.js bundle size on Vercel?
Install bundle-cop-vercel-plugin, point Next.js adapterPath at the adapter, and deploy. Bundle Cop analyzes build output on Vercel, attributes large modules to the importing file, and can fail the build when budgets are exceeded.
What causes Next.js bundles to grow on Vercel?
Heavy dependencies such as moment, lodash, or chart libraries often land through a single import. Without attribution, teams only notice after slower LCP or higher bandwidth. Bundle Cop shows the culprit file on every deploy.
Is Bundle Cop a webpack-bundle-analyzer alternative for Vercel?
Yes for shipping workflows. Instead of a local analyzer UI only, Bundle Cop runs in the Next.js build, writes bundle-report.json, diffs against production, and can post Vercel Checks so regressions are caught in CI.
Can I enforce a Next.js bundle budget on deploy?
Yes. Add bundle-cop.config.json with path budgets and set enforce to warn or error. Error fails the build when the client bundle exceeds your limit.
Deep dive: Optimize Next.js bundle size on Vercel.
Open source. Ready to install.
MIT licensed. Published on npm as bundle-cop-vercel-plugin.