Type Alias HashMapType<D, K>

HashMapType: { [key in D[K] & (string | number)]: D }

Represents a hashmap type constructed from a collection type D.

Keys of the hashmap are derived from the property K of D (which must be a string or number), and values are of type D.

Type Parameters

D extends ObjectType
The object type which must extend ObjectType.
K extends keyof D = StringNumberKeys<D>
The key of D whose values will be used as keys in the hashmap. Defaults to the keys of D whose values are string or number.

Example

type User = { id: number; name: string };
type UserMap = HashMapType<User, 'id'>;
// Equivalent to { [key: number]: User }

Source

export type HashMapType<
  D extends ObjectType,
  K extends keyof D = StringNumberKeys<D>
> = {
  [key in D[K] & (string | number)]: D;
};