example.drupal.composer.json

{
    "name": "custom-project/drupal-vm",
    "description": "",
    "type": "project",
    "license": "MIT",
    "authors": [
        {
            "name": "",
            "role": ""
        }
    ],
    "repositories": [
        {
            "type": "composer",
            "url": "https://packages.drupal.org/8"
        }
    ],
    "require": {
        "composer/installers": "^1.0.20",
        "drupal-composer/drupal-scaffold": "^2.0.1",
        "drupal/core": "~8.1",
        "drupal/devel": "1.x-dev"
    },
    "replace": {
        "drupal/drupal": "*"
    },
    "minimum-stability": "dev",
    "prefer-stable": true,
    "extra": {
        "installer-paths": {
            "docroot/core": ["type:drupal-core"],
            "docroot/modules/contrib/{$name}": ["type:drupal-module"],
            "docroot/profiles/contrib/{$name}": ["type:drupal-profile"],
            "docroot/themes/contrib/{$name}": ["type:drupal-theme"],
            "drush/contrib/{$name}": ["type:drupal-drush"]
        }
    },
    "config": {
        "process-timeout": 1200
    }
}