1. use-npm-double-dash.sh

# Use `npm run --` to avoid global installs of modules

# We can use npm scripts to "proxy" to locally installed packages without global
# installations and without appending ./node_modules/... to the command we want 
# to call.

# PROBLEM:

# Calling a locally installed module from the terminal won't work:
$ webpack
webpack: command not found

# Calling a locally installed module using ./node_modules is ugly
$ ./node_modules/webpack/bin/webpack.js --version
2.2.1

2. package.json

{
  "devDependencies": {
    "webpack": "*",
    "karma": "*"
  },
  
  "scripts": {
    "webpack": "webpack",
    "karma": "karma"
  }
}

3. after-double-dash.sh

# Use npm to call webpack with double dash: "npm run --" 
$ npm run webpack -- --version

> [email protected] webpack /home/miguelrincon/myproject
> webpack "--version"

2.2.1

# Use any argument

$ npm run webpack -- stats

> [email protected] webpack /home/miguelrincon/myproject
> webpack "stats"

...
bundle.js  2.02 MB       0  [emitted]  [big]  main
   [1] ../~/webpack/buildin/global.js 509 bytes {0} [built]
+ 26 hidden modules
...