import { IObservableWithChange, ITransaction } from '../base';
/**
 * Creates a signal that can be triggered to invalidate observers.
 * Signals don't have a value - when they are triggered they indicate a change.
 * However, signals can carry a delta that is passed to observers.
 */
export declare function observableSignal<TDelta = void>(debugName: string): IObservableSignal<TDelta>;
export declare function observableSignal<TDelta = void>(owner: object): IObservableSignal<TDelta>;
export interface IObservableSignal<TChange> extends IObservableWithChange<void, TChange> {
    trigger(tx: ITransaction | undefined, change: TChange): void;
}
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