nodupdeps (No Duplicate Dependencies)

CLI that ensures that there is only a single version of a dependency installed.

Why?

Configuration

I want to use nconf for my config, but I also want to write tons of small modules that share that configuration. If I'm not super careful about specifying semver compatible versions, and running npm dedupe, I could easily load two versions of nconf that don't share the configuration.

Optimizing frontend assets

If I'm using webpack, I probably want to try to only bundle in one version of React to minimize the payload. [Webpack does this for you automatically], but if you have different versions it will bundle in both copies. Use nodupdeps to alert you to possible optimizations.

How?

npm install -g nodupdeps

nodupdeps [packageName ...]

When?

I'd add a post install hook!

package.json

{
  ...
  "scripts": {
    "postinstall": "nodupdeps nconf"
  },
  "devDependencies": {
    "nodupdeps": "*"
  },
  ...
}

Examples

> nodupdeps source-map lodash

Error: Duplicates found.

source-map
   node_modules/babel/node_modules/source-map
   node_modules/babel-core/node_modules/source-map
   node_modules/babel-core/node_modules/source-map-support/node_modules/source-map
   node_modules/css-loader/node_modules/postcss/node_modules/source-map
   node_modules/eslint/node_modules/handlebars/node_modules/source-map
   node_modules/eslint/node_modules/handlebars/node_modules/uglify-js/node_modules/source-map
   node_modules/isparta-loader/node_modules/isparta/node_modules/escodegen/node_modules/source-map
   node_modules/isparta-loader/node_modules/isparta/node_modules/istanbul/node_modules/handlebars/node_modules/source-map
   node_modules/isparta-loader/node_modules/isparta/node_modules/istanbul/node_modules/handlebars/node_modules/uglify-js/node_modules/source-map
   node_modules/isparta-loader/node_modules/isparta/node_modules/source-map
   node_modules/karma/node_modules/source-map
   node_modules/karma-coverage/node_modules/istanbul/node_modules/escodegen/node_modules/source-map
   node_modules/karma-coverage/node_modules/istanbul/node_modules/handlebars/node_modules/source-map
   node_modules/karma-coverage/node_modules/istanbul/node_modules/handlebars/node_modules/uglify-js/node_modules/source-map
   node_modules/karma-coverage/node_modules/source-map
   node_modules/karma-webpack/node_modules/source-map
   node_modules/react/node_modules/envify/node_modules/jstransform/node_modules/source-map
   node_modules/webpack/node_modules/uglify-js/node_modules/source-map
   node_modules/webpack/node_modules/webpack-core/node_modules/source-map

lodash
   node_modules/babel/node_modules/lodash
   node_modules/babel-core/node_modules/lodash
   node_modules/css-loader/node_modules/cssnano/node_modules/postcss-svgo/node_modules/svgo/node_modules/js-yaml/node_modules/argparse/node_modules/lodash
   node_modules/eslint/node_modules/inquirer/node_modules/lodash
   node_modules/eslint/node_modules/js-yaml/node_modules/argparse/node_modules/lodash
   node_modules/isparta-loader/node_modules/isparta/node_modules/istanbul/node_modules/js-yaml/node_modules/argparse/node_modules/lodash
   node_modules/karma/node_modules/lodash
   node_modules/karma-coverage/node_modules/istanbul/node_modules/js-yaml/node_modules/argparse/node_modules/lodash
   node_modules/karma-webpack/node_modules/lodash