npm-dedupe
reduces duplication in the package tree by moving dependencies higher
TLDR
Deduplicate dependencies
$ npm dedupe
Dry run (show what would change)$ npm dedupe --dry-run
Include dev dependencies$ npm dedupe --include=dev
Dedupe with legacy bundling$ npm dedupe --legacy-bundling
SYNOPSIS
npm dedupe [options]
DESCRIPTION
npm dedupe reduces duplication in the package tree by moving dependencies higher in the tree where they can be shared. This can reduce node_modules size significantly.
The command restructures but doesn't change package-lock.json versions.
PARAMETERS
--dry-run
Show changes without applying.--include type
Include dependency type.--omit type
Omit dependency type.--legacy-bundling
Use legacy algorithm.--strict-peer-deps
Fail on peer dep issues.
EXAMPLE
$ # Before dedupe
node_modules/
├── a/
│ └── node_modules/lodash@4.0.0
└── b/
└── node_modules/lodash@4.0.0
# After dedupe
node_modules/
├── a/
├── b/
└── lodash@4.0.0
node_modules/
├── a/
│ └── node_modules/lodash@4.0.0
└── b/
└── node_modules/lodash@4.0.0
# After dedupe
node_modules/
├── a/
├── b/
└── lodash@4.0.0
CAVEATS
May not reduce size if version ranges differ. Run after npm install. Restructures tree only.
HISTORY
npm dedupe was introduced to help manage the duplicate dependency problem common in npm's nested node_modules structure.
SEE ALSO
npm(1), npm-prune(1), npm-install(1)