Work with Zod Literals and Enums Effectively

In this lesson we make string-based schemas more specific using Zod in TypeScript. We focus on defining allowed values for a room type, showing how to use literals and enums effectively.

Zod's z.literal method allows us to specify a single allowed value for a string schema. For example, if we want to define a room type as "premium" and make it backward-type-safe in TypeScript, we can use z.literal("premium") to ensure that only this value is valid.

z.enum lets us define a set of allowed string values. This is useful when we have multiple options for room types, like "standard", "premium" or "childrenFriendly".

z.enum creates a union of TypeScript-compatible string literals, making it easy to validate against multiple values. Zod enums can be used to extract or exclude specific values from the enum.

Finally, zod's z.nativeEnum a native enum creates an equivalent of TypeScript's native enum ("real enums", we could say).

We can validate against all these values just like we do with literals and enums.