composer.json

{
    "require": {
        "africastalking/africastalking": "^3.0",
        "composer/installers": "^2.2",
        "chartjs/chartjs": "2.7.2",
        "php-flasher/flasher-toastr": "^1.7",
        "tamtamchik/simple-flash": "^2.0"
    },
    "config": {
        "allow-plugins": {
            "composer/installers": true
        }
    },

    "extra": {
        "installer-paths": {
            "libraries/{$name}": ["type:drupal-library"]
        }
    },


    "repositories": [
        {
            "type": "package",
            "package": {
                "name": "chartjs/chartjs",
                "version": "v2.7.2",
                "type": "drupal-library",
                "extra": {
                    "installer-name": "chartjs"
                },
                "dist": {
                    "url": "https://www.chartjs.org/dist/2.7.2/Chart.bundle.js",
                    "type": "file"
                }
            }
        }
    ]

}