Function clone

tools/ngd-graphs.js:218–232

let i = 0,
    failedRepositories = [],
    clone = repo => {
        return new Promise(function(resolve, reject) {
            exec(
                'git clone https://github.com/' + repo.maintainer + '/' + repo.name,
                (error, stdout, stderr) => {
                    if (error) {
                        console.error(`exec error: ${error}`);
                        reject();
                    } else {
                        resolve();
                    }
                }
            );
        });
    },
    generateGraph = repo => {
        return new Promise(function(resolve, reject) {
            var tsconfig = 'tsconfig.json';