Can we create an intersection type of Records by pairing keys with tuples or unions of values in a one-to-one correspondence?

If I have tuples similar to this for keys and values:

type Keys = ['North', 'East', 'South', 'West'];
type Values = ['n', 'e', 's', 'w'];

Is there a way to achieve a structure like this:

type OneToOne<
  K extends [...(string | number | symbol)[]],
  V extends [...unknown[]]
> = Record<K[0], V[0]>
  & Record<K[1], V[1]>
  & Record<K[2], V[2]>
  & Record<K[3], V[3]>;

How can this be adapted for tuples or string unions of any length? The specific format of tuples or unions for K and V doesn't matter as long as they are of the same length.

typescript

Answer №1

To iterate over the keys of Keys and filter out only number keys like "0", "1", etc., a mapped type can be used. The number key can then be used to index into Keys for the property type in the as clause of the mapped type to retrieve the corresponding value from Values:

type Keys = ['North', 'East', 'South', 'West'];
type Values = ['n', 'e', 's', 'w'];

type KetValues<K extends PropertyKey[], V extends Record<keyof K & number, string>> = {
  [P in keyof K as P extends `${number}` ? K[P] & PropertyKey : never]: V extends Record<P, infer Prop> ? Prop: never
}

type x = KetValues<Keys, Values>
// type x = {
//     North: "n";
//     East: "e";
//     South: "s";
//     West: "w";
// }

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