import { Get } from './Get';
import { Optional } from './Types';
export type Constructor<T = unknown> = {
    new (...args: any[]): T;
};
export type Construct<Out, In = any> = Get<Out, In> | Constructor<Out>;
export declare const isConstructor: <T>(c?: unknown) => c is Constructor<T>;
export declare const isInstance: <T>(ctor: Constructor<T>, o?: unknown) => o is T;
export declare const ofConstruct: <T>(c: Construct<T>, ...args: unknown[]) => T;
export declare const toName: (subject?: unknown, postfix?: string) => string;
export declare const on: <T, R>(t: T, f: (t: T) => R) => R extends Promise<unknown> ? Promise<T> : T;
export declare const use: <T, Out>(t: T, f: (t: T) => Out) => Out;
export declare const ifA: <T>(c: Constructor<T>, t?: unknown, alt?: unknown) => Optional<T>;
export type RequireAtLeastOne<T, Keys extends keyof T = keyof T> = Pick<T, Exclude<keyof T, Keys>> & {
    [K in Keys]-?: Required<Pick<T, K>> & Partial<Pick<T, Exclude<Keys, K>>>;
}[Keys];