Union template literal types are preprended in Typescript

Is there a method to generate specific string types from existing string types with a designated prefix? It's better to acknowledge that it doesn't exist than to dwell on this concept.

type UserField = "id" | "name";
type PostField = "id" | "message" | ("author." + UserField); // Is there a way to do this?
let somePostFields: PostField[] = ["id", "message", "author.name"];

Answer №1

String interpolation in template literal types allows for the combination of union types like seen in this example.

type AnimalType = "dog" | "cat";
type SoundType = "bark" | "meow" | `sound.${AnimalType}`;

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