What is the difference between using enum and a union of string literals?

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An enum is a type that allows a developer to define a set of named constants, while a union of string literals is a way to define a type that can hold one of several possible string values.

Enums are more powerful than a union of string literals, as they allow for the specification of specific values and can be used for type checking, switch statements, and more. On the other hand, unions of string literals can be useful in certain situations where a fixed set of string values needs to be validated, but where the values themselves do not necessarily have any intrinsic meaning.

Overall, the main difference is that enums provide a more structured way of defining a set of named constants, while unions of string literals provide a more flexible and unstructured way of defining a fixed set of possible string values.