/**
 * Runs one task at a time; a task scheduled while another runs replaces any
 * task still waiting, so only the newest request starts next. Editors use it
 * for projection loads: replaying a long history emits one revision per
 * committed transaction, and composing a projection for each of them at once
 * would overrun the artifact Worker's bounded request queue.
 */
export declare function createLatestTaskRunner(): (task: () => Promise<void>) => void;
/**
 * One runner per artifact session. A composition still pending on a replaced
 * session (for example one whose Worker stopped answering) must never hold up
 * the next session's first load, so the runner is scoped to the session object
 * rather than to the component.
 */
export declare function useLatestTaskRunner(session: object): (task: () => Promise<void>) => void;