const X= "Hey"
const Y= "See ya"
const Z="Bar"
const myArray=[X,Y,Z]
type TransformArrayToUnion<myArrayOfConstants>"Hey" | "See ya" | "Bar".I attempted it with
type TransformArrayToUnion<T extends readonly string[]>= T[number]
However, in this scenario, I am not passing an array of strings, but the variable name of each constant (which seems to be a tupple), so it fails to function as intended.
Here's a different approach:
let x = 10;
let y = 20;
const sum = x + y;
console.log(sum);
To define a constant array in TypeScript, you can utilize the as const syntax along with the typeof keyword.
const X = "Apple";
const Y = "Banana";
const Z = "Cherry";
const myArray = [X, Y, Z] as const;
type FruitType = typeof myArray[number]; // "Apple" | "Banana" | "Cherry"
let transform = arrayOfConstants as const;
// defining UnionType as a type that contains three specific string literals
type UnionType = typeof transform[number];
Hopefully this information proves useful
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