composer.md

Using a local package repository

{
	"repositories": {
		"the_module": {
			"type": "path",
			"url": "./Repository/the_module"
		}
    ...
    

Run

composer require myvendor/the_module @dev

Results in

  - Installing myvendor/the_module (dev-whatever-branch-you-are-in): Symlinking from ./Repository/the_module