What are some use cases for const assertions in TypeScript?

What are some use cases for const assertions in TypeScript?

Const assertions in TypeScript allow you to specify that a value should be treated as a literal type. This can be useful in various scenarios, such as when defining constant values that should not be changed or when working with complex data structures.

Can you give me an example of how to use const assertions?

Sure! For instance, if you have an array of strings and you want to ensure that its type is a tuple of those strings, you can use a const assertion like this: const colors = ['red', 'green', 'blue'] as const; This way, colors will have the type readonly ['red', 'green', 'blue'].

What are the benefits of using const assertions?

The benefits include improved type safety, preventing accidental mutations, and enabling better type inference for complex data structures.

Are there any limitations to using const assertions?

Yes, one limitation is that const assertions can only be applied to certain types of values, and they may not work as expected with dynamic data.