We'll use the Angular Generator to create other Angular files such as interfaces and services.
The local development instructions uses the Angular CLI command ng g i interfaces/todo-item to create the interfaces folder and the interface file in one command. Unfortunately, we have to work around a small bug in StackBlitz and create the folder manually.
Right click on the app folder and select New Folder and name the folder interfaces.
Now we can use the Angular Generator. Right click on interfaces and select Angular Generator, then select Interface.
Type todo-item in the text box to create the interface.
Only component files have HTML templates so we don't need to shuffle any code around.