interface Members {
    [key: string]: unknown;
}
declare type Constructor<Args extends unknown[], Return extends unknown> = new (...args: Args) => Return;
declare type AnyConstructor = Constructor<any[], any>;
/**
 * A representation of a constructor and its recursively-defined parent relationships
 * and its `next` method (potentially supplied a different key).
 */
declare type Chainable<Source extends AnyConstructor, NextKey extends string, LastMembers extends Members = {
    [Key in keyof Source]: Source[Key];
}> = Constructor<ConstructorParameters<Source>, InstanceType<Source>> & LastMembers & Record<NextKey, <NewMembers extends Members, NextMembers extends Members = {
    [Key in Exclude<keyof LastMembers, keyof NewMembers>]: LastMembers[Key];
} & NewMembers>(newMembers: NewMembers & ThisType<NextMembers>) => Chainable<Source, NextKey, NextMembers>>;
/**
 * Extends from a constructor and casts the new class as an instance of `Chainable`.
 *
 * @param source - The constructor to extend and coerce into a chainable.
 * @param key - The name of the method for moving down the chain.
 */
export declare const Chainable: <Source extends Constructor<any[], any>, NextKey extends string = "next">(source: Source, key?: NextKey | undefined) => Chainable<Source, NextKey, { [Key in keyof Source]: Source[Key]; }>;
export {};
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