Unpack a bundle

npx wakaru bundle.js --unpack -o out/

Wakaru detects the bundle format automatically, splits the bundle into one file per module, and decompiles each module.

Supported bundlers

You don't have to pass a format flag for any of these:

• webpack 4/5
• @vercel/ncc
• Rollup / Vite scope-hoisted ESM output (heuristic)
• esbuild / Bun
• Metro (React Native)
• Browserify, including Cocos Creator 2.x
• Closure ModuleManager
• SystemJS
• AMD/UMD wrappers

Bun single-file executables work too. See Bun single-file executable.

Inputs

npx wakaru entry.js chunk.js --unpack -o out/   # multiple explicit files
npx wakaru dist/ --unpack -o out/               # recursively scan a directory

Directory inputs recursively scan .js, .mjs, and .cjs files. Hidden paths and node_modules are skipped. Only files detected as bundles or chunks are included.

Output

One file per module. A small production webpack bundle with four modules comes out like this:

out/
├── entry.js
├── module-184.js
├── module-611.js
└── module-823.js

Module filenames come from the best available evidence. When the bundle still carries real paths, such as webpack string IDs or Browserify dependency maps, Wakaru uses them. Other modules get stable generated names like module-184.js above, where the number is the bundle's own module ID. Name collisions receive numeric suffixes.

The output directory must be new or empty unless you pass --force.

Variants

npx wakaru bundle.js --unpack --raw -o out/       # raw split, no readability transforms
npx wakaru bundle.js --unpack=strict -o out/      # structural detection only, no heuristic fallback
npx wakaru bundle.js --unpack=inspect -o out/     # finer boundaries for static inspection

--raw splits the bundle without any readability rewrites. Module names stay provisional, and the result is not a usable module graph.

--unpack=inspect splits at finer boundaries for static inspection. The result may not preserve initialization order. Do not treat it as runnable code.

See the CLI reference for the full option list.