import type { MessageStreamEvent } from "#protocol/message.js";
import type { RuntimeHookRegistry } from "#runtime/hooks/registry.js";
import type { ContextContainer } from "./container.js";
/**
 * Fans one runtime stream event out to every matching subscriber.
 * Authored handler failures are logged independently. Caller must hold an
 * active ALS scope so hooks see the same context as the rest of the step.
 */
export declare function dispatchStreamEventHooks(input: {
    readonly ctx: ContextContainer;
    readonly registry: RuntimeHookRegistry;
    readonly event: MessageStreamEvent;
    /** Stops the running turn for `ctx.cancel()`; `undefined` when this event cannot stop one. */
    readonly cancelTurn: (() => void) | undefined;
}): Promise<void>;