import DataSource from './data-source';
export declare class Watcher {
    private dataSource;
    private middleware;
    private actionListeners;
    private entryListeners;
    private cancellers;
    constructor(dataSource: DataSource);
    resolveEntity(entityName: string, resolver: () => string | Promise<string>): void;
    /**
     * Watches for actions with the specified entry id and action label.
     * @param entryId Id of `Entry` to watch for.
     * @param actionKey Label of action to watch for.
     * @param listener Handler for when a match is found.
     */
    watchAction(entryId: string, actionKey: string, listener: (data: any) => boolean | Promise<boolean>): void;
    stop(): void;
}
export declare type WatchCancellation = () => void;
export declare function watch(dataSource: DataSource, handler: (watcher: Watcher) => void): WatchCancellation;
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