klumpen

A universal bundle analyzer for JavaScript projects. Auto-detects your bundler, runs the build, and shows an interactive breakdown in your terminal.

Supported Bundlers

esbuild · Rollup · Vite · webpack · Wrangler

Install

bun add -g klumpen

Usage

cd your-project
klumpen

Klumpen scans for bundler configs, builds your project, and opens an interactive TUI with four views:

• Summary — output size, source size, package & module counts
• Packages — npm packages sorted by contribution to bundle size
• Modules — individual files sorted by size
• Import Chains — how each package is reached from the entry point

Press o to open a treemap visualization in your browser.

Flags

klumpen [target]   Analyze a specific target by name
klumpen --no-tui   Plain text output
klumpen --json     JSON output for scripting

Keys

Key	Action
tab	Switch views
j / k	Navigate
[ / ]	Switch targets
o	Open treemap
q	Quit

How It Works

Klumpen auto-detects bundler targets in your project (including monorepo subdirectories like apps/, packages/, services/), invokes each bundler's native build, parses the output metadata, and renders the results.

License

MIT