{
    "name": "pike/slim-jade",
    "description": "A helper for slim framework view to allow the use of phpJade as a template engine",
    "type": "library",
    "require": {
        "kylekatarnls/jade-php": "dev-master",
        "slim/slim": "^3.0.0@beta"
    },
    "require-dev": {
        "kylekatarnls/jade-php": "dev-master",
        "slim/slim": "^3.0.0@beta"
    },
    "license": "MIT",
    "authors": [
        {
            "name": "William Pike",
            "email": "pikewb@gmail.com"
        }
    ],
    "autoload": {
        "psr-4": {
            "Slim\\Views\\": "src"
        }
    },
    "minimum-stability": "dev"
}

{
    "name": "pike/slim-jade",
    "description": "A helper for slim framework view to allow the use of phpJade as a template engine",
    "type": "library",
    "require": {
        "kylekatarnls/jade-php": "dev-master",
        "slim/slim": "^3.0.0@beta"
    },
    "require-dev": {
        "pug-php/pug": "^2.4",
        "slim/slim": "^3.0.0@beta"
    },
    "license": "MIT",
    "authors": [
        {
            "name": "William Pike",
            "email": "pikewb@gmail.com"
        }
    ],
    "autoload": {
        "psr-4": {
            "Slim\\Views\\": "src"
        }
    },
    "minimum-stability": "dev"
}

Use Pug (Jade new name)
Use Pug (Jade new name)

I recommand to use the official Pug repository https://github.com/pug-php/pug,
kylekatarnls/jade-php is now just a mirror and I do not garantee I will continue to maintain it.

Moreover, I encourage you to use the new version 2.