What are common mistakes when using types and interfaces in TypeScript?

What are some common mistakes people make when using types and interfaces in TypeScript?

Some common mistakes include using interfaces and types interchangeably, not extending interfaces properly, and forgetting to define optional properties.

Can you explain the difference between types and interfaces?

Yes! Types are more flexible and can represent any valid TypeScript type, while interfaces are specifically for defining object shapes.

When should I use an interface instead of a type?

Use interfaces when you want to define the structure of an object and take advantage of declaration merging. Use types for more complex types or unions.

What happens if I try to extend a type?

You can't extend a type like you can with an interface. Instead, you can create a new type that combines existing types using intersections.

Are there any performance implications of using one over the other?

Generally, there are no significant performance differences. The choice should be based on the use case and code readability.