import { OnDestroy } from '@angular/core';
import { ControlValueAccessor } from '@angular/forms';
import { Observable, Observer, Subject, Subscription } from 'rxjs';
export declare type OnChangeFn<T> = (value: T | null) => void;
export declare type OnTouchedFn = () => void;
export declare function noop(): void;
export declare abstract class Control<T> implements ControlValueAccessor {
    value: T | null;
    disabled: boolean;
    onChangeFn: OnChangeFn<T>;
    onTouchedFn: OnTouchedFn;
    modelValue$: Subject<T>;
    writeValue(value: T | null): void;
    registerOnChange(fn: (value: T | null) => void): void;
    registerOnTouched(fn: () => void): void;
    updateByAction(value: T | null): void;
    setDisabledState(disabled: boolean): void;
    abstract handleUpdate(self: boolean): void;
    abstract handleDisabled(): void;
}
export declare abstract class CompositeControl<T> extends Control<T> {
    parentComposite?: CompositeControl<T>;
    compositeValue: T;
    compositeStatus$: Subject<void>;
    value: T;
    readonly status$: Subject<void>;
    handleUpdate(self: boolean): void;
    handleDisabled(): void;
}
export declare abstract class ControlItem implements OnDestroy {
    status$$: Subscription;
    abstract ngOnDestroy(): void;
}
export declare abstract class KeyedCompositeControl<K, V, T = K> extends CompositeControl<T> {
    abstract parentComposite?: KeyedCompositeControl<K, V, T>;
    pendingKeyedChanges: Map<K, V>;
    keyedObservers: Map<K, Observer<V>>;
    observeKey(key: K): Observable<V>;
    flushKey(key: K): void;
}