What are the differences between conditional types and union types in TypeScript?

What are the differences between conditional types and union types in TypeScript?

Conditional types allow you to create types based on conditions, while union types combine multiple types into one.

Can you give me an example of a conditional type?

Sure! A conditional type looks like this: T extends U ? X : Y, where T is checked against U.

And how would a union type look?

A union type is defined using the pipe symbol, like this: string | number, meaning it can be either a string or a number.

When should I use conditional types over union types?

Use conditional types when you need to derive a type based on another type's properties, and union types when you want to allow multiple types.