import { AsyncHandler } from './AsyncHandler';
/**
 * A wrapper handler that will only run the wrapped handler if it is executed from:
 * * when running multithreaded: either the **primary** or a **worker process**
 * * when running singlethreaded: **the only process** (i.e. always)
 */
export declare class ProcessHandler<TIn, TOut> extends AsyncHandler<TIn, TOut> {
    protected readonly source: AsyncHandler<TIn, TOut>;
    protected readonly executeOnPrimary: boolean;
    protected isSingleThreaded: boolean;
    /**
     * Creates a new ProcessHandler
     *
     * @param source - The wrapped handler
     * @param executeOnPrimary - Whether to execute the source handler when the process is the _primary_ or a _worker_.
     */
    constructor(source: AsyncHandler<TIn, TOut>, executeOnPrimary: boolean);
    canHandle(input: TIn): Promise<void>;
    handle(input: TIn): Promise<TOut>;
    /**
     * Checks if the condition has already been fulfilled.
     */
    protected canExecute(): boolean;
}