export type Mutable<T> = {
    -readonly [P in keyof T]: T[P];
};
export type ValueOf<T> = T[keyof T];
export type Merge<M, N> = Omit<M, keyof N> & N;
/** utility type to assert that the second type is a subtype of the first type.
 * Returns the subtype. */
export type SubtypeOf<Supertype, Subtype extends Supertype> = Subtype;
export type ResolutionType<T extends (...args: any) => any> = T extends (...args: any) => Promise<infer R> ? R : any;
export type MarkOptional<T, K extends keyof T> = Omit<T, K> & Partial<Pick<T, K>>;
export type MarkRequired<T, RK extends keyof T> = Exclude<T, RK> & Required<Pick<T, RK>>;
export type MarkNonNullable<T, K extends keyof T> = {
    [P in K]-?: P extends K ? NonNullable<T[P]> : T[P];
} & {
    [P in keyof T]: T[P];
};
export type NonOptional<T> = Exclude<T, undefined>;
export type SignatureType<T> = T extends (...args: infer R) => any ? R : never;
export type CallableType<T extends (...args: any[]) => any> = (...args: SignatureType<T>) => ReturnType<T>;
export type ForwardRef<T, P = any> = Parameters<CallableType<React.ForwardRefRenderFunction<T, P>>>[1];
export type ExtractSetType<T extends Set<any>> = T extends Set<infer U> ? U : never;
export type SameType<T, U> = T extends U ? (U extends T ? true : false) : false;
export type Assert<T extends true> = T;
export type NestedKeyOf<T, K = keyof T> = K extends keyof T & (string | number) ? `${K}` | (T[K] extends object ? `${K}.${NestedKeyOf<T[K]>}` : never) : never;