ObjectFromEntries

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题目

Implement the type version of Object.fromEntries

For example:

interface Model {
  name: string;
  age: number;
  locations: string[] | null;
}

type ModelEntries =
  | ["name", string]
  | ["age", number]
  | ["locations", string[] | null];

type result = ObjectFromEntries<ModelEntries>; // expected to be Model

解答

type ObjectFromEntries<T extends [string, any]> = {
  [K in T[0]]: T extends [K, any] ? T[1] : never;
};