/** @internal */
export type Mandatory<T extends {}, K extends keyof T> = Omit<T, K> & {
    [MK in K]-?: NonNullable<T[MK]>;
};
/** @internal */
export type MergeTypes<Fields extends Record<string, any>> = {
    [Tag in keyof Fields]: (x: Fields[Tag]) => null;
} extends Record<string, (x: infer U) => null> ? U : never;
export type Merge<T1 extends any, T2 extends any> = ((x: T1) => null) | ((x: T2) => null) extends (x: infer U) => null ? U : never;