This is a Node Addon Playground made by myself. I'll soon be making an article about it on my blog.
FIRST OF ALL, CHECK THE NODE-ADDON-API REPOSITORY (HERE)[https://github.com/nodejs/node-addon-api#examples]. It contains initial instructions about the setup and first running of node-gyp with your first addon.
To run all the addons you first need to clone the project and then run npm install or yarn (depending on the package manager you're using). Probably at the end of the node-gyp install process the addons will already be built, but if you don't see a build folder at the root folder of the project, follow this step: Run the build script with npm run build or yarn build to make node-gyp build the addons correctly.