Composer JSON with preloadin

composer.json

{
    "name": "application/project",
    "description": "This is my root project.",
    "require": {
        "php": "^7.2",
        "ext-json": "*",
        "symfony/http-client": "5.*",
        "symfony/console": "5.*"
    },
    "autoload": {
        "psr-4": {
            "Application": "app/"
        }
    },
    "preload": {
        "exclude": [
            "symfony/console"
        ],
        "input": [
            "preload.php"
        ],
        "output": "preload-compiled.php"
    }
}