composer_repositories_local.txt

// Let's say you have a local package which you want to do some develoment on by including it in another project
/Users/jamesmills/Projects/Packages/larapex-charts

// You can use this one-liner to have composer install it from you local file system
composer config repositories.local '{"type": "path", "url": "/Users/jamesmills/Projects/Packages/larapex-charts"}' --file composer.json

// Which will add this to your composer.json file
"repositories": {
    "local": {
        "type": "path",
        "url": "/Users/jamesmills/Projects/Packages/larapex-charts"
    }
}

// Now the composer require/update etc will use this path for this package
composer require arielmejiadev/larapex-charts 
...
Package operations: 0 installs, 1 update, 0 removals
  - Removing arielmejiadev/larapex-charts (4.0.0)
  - Installing arielmejiadev/larapex-charts (dev-sparklines): Symlinking from /Users/jamesmills/Projects/Packages/larapex-charts