Install the Azure storage emulator and the Azure storage explorer and run them. You should see Emulator - Default Ports (Key) under storage accounts.
npm i
Open BlobTrigger/index.js and hit F5, you should get a message saying it's running locally.
Create a new blob container called 'samples-workitems' in the explorer and upload a text file. If all is well, it should log to the console.
npm run test
The project was generated using the Azure Functions Core tools and the Azure Functions VSCode extension. Instructions for setting up a basic hello-world type project can be found here.