import type { OrchestrationInput } from "../types.js";
import { type DurableSessionRuntime } from "./state.js";
/**
 * Put an item back at the HEAD of the FIFO.
 *
 * decide() peeks by popping. When the popped item turns out not to be
 * mergeable it has to go back — and appending it put it BEHIND everything
 * still queued: a FIFO of [kickoff, "do X", "cancel X"] dispatched the
 * kickoff and left ["cancel X", "do X"], so the next turn read the two in
 * the wrong order. The item was just popped from the head of the first
 * non-empty bucket, so the head of that bucket is exactly where it belongs.
 * If it no longer fits there (it always should — the bucket only shrank),
 * fall back to append rather than lose it.
 */
export declare function prependToFifo(runtime: DurableSessionRuntime, item: any): void;
export declare function appendToFifo(runtime: DurableSessionRuntime, newItems: any[]): void;
export declare function drain(runtime: DurableSessionRuntime): Generator<any, void, any>;
export declare function decide(runtime: DurableSessionRuntime): Generator<any, boolean, any>;
export { OrchestrationInput };
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