keys = [firstName, lastName, email,...] //this is an ever-changing array of keys.I am looking to generate a TypeScript interface dynamically based on the keys array provided.
interface User {
firstName : string;
lastName : string;
email : string;
...
}
Any suggestions on how to achieve this?
It can be challenging to pinpoint this precisely as it hinges on the typing of your variables such as key1.
To determine the typeof values in keyArray, we use (typeof keyArray)[number] and establish a type with those types as keys and string as the respective value:
type FromKeys = Record<(typeof keyArray)[number], string>
However, the key type pertains to the type of key1, not the actual value. If the type of key1 is a string literal, this aligns with what you need. Yet, if the type is simply string, then the FromKeys type will permit any string property, rendering it less practical.
type FromKeys<T extends readonly PropertyKey[]> = Record<T[number], string>
declare function makeObject<T extends readonly PropertyKey[]>(keyArray: T): FromKeys<T>;
const obj1 = makeObject(["a", "b", "c"]); // Record<string, string>
const obj2 = makeObject(["a", "b", "c"] as const); // Record<"a" | "b" | "c", string>
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