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What are the user-defined types in typescript?

Besides built-in data types, the user can also define his own data type using classes, interfaces, arrays, Enumerations (enum) and tuple.

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What is typescript? Advantages of using typescript. Who developed typescript? Drawbacks of typescript. Inbuilt datatypes in typescript. What are the user-defined types in typescript? Difference between Typescript and Javascript. Does typescript support abstract class? Does JavaScript support modules like typescript? How do I install typescript in my computer? How do I compile typescript files? What are Modules in Typescript? Explain interface in typescript. Does typescript support all object oriented paradigm? How do I compile typescript files automatically with changes to file in real-time? What is class in typescript? What is namespace in Typescript? What does the question mark (?) on a typescript variable/parameter name denote? What is debouncing? What is the difference between Subject and BehaviorSubject? Dynamic vs Static Typing. What is the Difference Between '!:' and '?:' in TypeScript object definitions?

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