Following the guide from: https://aurelia.io/docs/tutorials

• Doing the TypeScript approach.

Issues

• documentation says its okay to use *.js extension to write the /src scripts but actually if you choose TypeScript approach you'll have to use .ts extension
• also, simply loading index.html to browser won't work, you'll hit CORS policy, better choose webservers like PHP's php -s localhost:8888
• the web component's file, i.e. app.html should also reside inside /src folder same folder as its module app.js

Apps

• Todo App => /todo-app