How to download and setup diagnostics
Open terminal and run command
                                            git clone https://github.com/nodejs/diagnostics.git
                                        
                                        git clone is used to create a copy or clone of diagnostics repositories.
                                        You pass git clone a repository URL. it supports a few different network protocols and corresponding URL formats.
Also you may download zip file with diagnostics https://github.com/nodejs/diagnostics/archive/master.zip
Or simply clone diagnostics with SSH
                                            [email protected]:nodejs/diagnostics.git                                    
                                    If you have some problems with diagnostics
You may open issue on diagnostics support forum (system) here: https://github.com/nodejs/diagnostics/issuesSimilar to diagnostics repositories
Here you may see diagnostics alternatives and analogs
node next.js pm2 awesome-nodejs mocha ava nuxt NodeBB stdlib reactide brain.js backpack nvm-windows hashmap node-xml2js next-routes nodemon mean validator.js ws shelljs protractor nest apex supertest nock habitica dillinger node-elm vorpal