To make development easier and test that the code is reliable, we have a few extra files in this directory. We use the javascript development tool yarn to interact with them.
Install the node dependencies for testing and serving our files:
yarn install
Start a server where you can view the index.html page:
yarn start
You should now be able to see the sample map at localhost:8080.
If you don't see a map, make sure you have added your access token in index.html.