import type { Storage } from '../../storage/interface.ts';
import type { TimerEntry } from '../types.ts';
export type ScannedTimerEntry = {
    key: string;
    entry: TimerEntry;
};
export type TimerSource = {
    iterator: AsyncIterator<[string, Uint8Array]>;
    next: ScannedTimerEntry | null;
    readNext: (iterator: AsyncIterator<[string, Uint8Array]>, storage: Storage) => Promise<ScannedTimerEntry | null>;
};
export declare function compareScannedTimerEntries(left: ScannedTimerEntry, right: ScannedTimerEntry): number;
export declare function readNextScannedTimerEntry(iterator: AsyncIterator<[string, Uint8Array]>, storage: Storage): Promise<ScannedTimerEntry | null>;
export declare function readNextTerminalCleanupTimerEntry(iterator: AsyncIterator<[string, Uint8Array]>, storage: Storage): Promise<ScannedTimerEntry | null>;
export declare function readNextTeardownTimerEntry(iterator: AsyncIterator<[string, Uint8Array]>, storage: Storage): Promise<ScannedTimerEntry | null>;
export declare function advanceTimerSource(timerSource: TimerSource, storage: Storage): Promise<void>;
export declare function selectNextTimerSource(timerSources: TimerSource[]): TimerSource | undefined;
/**
 * `true` for a timer kind whose `timer-idx:` reverse-index entry is safe to
 * delete unconditionally on fire, with no read-and-compare first.
 * `'terminal-cleanup'`/`'teardown'` get no reverse index at all (never
 * cancelled out-of-band). `'schedule'`/`'sleep'`/`'wait-condition'` are
 * EXCLUDED even though this function's signature still accepts them —
 * `scheduler-class.ts`'s `#buildTimerIndexDeleteOperation` checks those three
 * kinds and routes them through the lookup-and-compare path BEFORE ever
 * calling this function, because each can have its deterministic id re-armed
 * by a legitimate successor (schedule's own re-arm-on-every-tick; a
 * `start-new` replacement reusing a sleep/wait-condition id) while the
 * original fire is still being cleaned up.
 */
export declare function shouldDeleteTimerIndexWithoutLookup(entry: TimerEntry): boolean;