Advanced Typescript

Type Declarations

• Types get stripped out during transpile
• Keeping types available is helpful for third-party use of your library
• You can create your own or install from others

Interfaces and Inheritance

• Just like in Java, describes "inputs" and "outputs" of an object
• Also like Java, classes and interfaces can be extended

Ajax

• fetch() makes an async request, but return is uncertain
• So...a promise is returned instead