/**
 * Fired on the {@link Engine} when a signal is delivered to a workflow via
 * `engine.signal` or `handle.signal`. Read `e.workflowId`, `e.signalName`,
 * and `e.payload` to observe signal delivery.
 *
 * @example
 * ```ts
 * import { Engine, SignalReceivedEvent } from '@lostgradient/weft';
 *
 * const engine = new Engine();
 * engine.addEventListener(SignalReceivedEvent.type, (event) => {
 *   console.log(event.workflowId, 'received signal', event.signalName);
 * });
 * ```
 */
export declare class SignalReceivedEvent extends Event {
    static readonly type: "signal:received";
    readonly workflowId: string;
    readonly signalName: string;
    readonly payload: unknown;
    constructor(workflowId: string, signalName: string, payload: unknown);
}
/**
 * Fired on the {@link Engine} when a pending `waitForSignal` operation in a
 * workflow is resolved by the delivered signal. Emitted after the signal
 * unblocks the workflow and resumes execution.
 *
 * @example
 * ```ts
 * import { Engine, SignalDeliveredEvent } from '@lostgradient/weft';
 *
 * const engine = new Engine();
 * engine.addEventListener(SignalDeliveredEvent.type, (event) => {
 *   console.log('signal', event.signalName, 'delivered to', event.workflowId);
 * });
 * ```
 */
export declare class SignalDeliveredEvent extends Event {
    static readonly type: "signal:delivered";
    readonly workflowId: string;
    readonly signalName: string;
    constructor(workflowId: string, signalName: string);
}