export type Nullable<T> = T | null | undefined;

export type Shape<T> = Pick<T, keyof T>;

type ObjectKeyType = string | number | symbol;

export type Diff<T extends ObjectKeyType, U extends ObjectKeyType> = ({
  [P in T]: P;
} & { [P in U]: never } & { [x: string]: never })[T];

export type Override<T, U> = Pick<T, Diff<keyof T, keyof U>> & U;

export type Entries<T, K> = (o: { [k: string]: K }) => Array<[T, K]>;