import { ValidationErrors, ValidatorFn } from '@angular/forms';
import { BehaviorSubject, Observable, ReplaySubject, Subject } from 'rxjs';
export declare class UserErrorSubject<T> extends BehaviorSubject<T> {
}
export declare class UserValueSubject<T> extends ReplaySubject<T> {
}
export declare class UserTriggerSubject<T> extends Subject<T> {
}
export declare function userValue<T>(value?: Observable<T> | T): UserValueSubject<T>;
export declare function userTrigger<T = any>(): UserTriggerSubject<T>;
export declare function userError(): UserValueSubject<ValidationErrors | null>;
export interface UserInputOptions {
    validators?: ValidatorFn[];
    /** Whether to emit values despite failing validation. */
    emitInvalid?: boolean;
}