export type WaitUntil = (promise: Promise<unknown>) => void;
export declare const BACKGROUND_DEADLINE_MS = 250;
/**
 * The platform's waitUntil for this request. Nitro's Netlify entry drops the
 * function context, but the runtime still keeps it in the AsyncLocalStorage
 * that `getContext()` from `@netlify/functions` reads, under this global symbol.
 */
export declare function platformWaitUntil(req?: unknown): WaitUntil | undefined;
/**
 * Keeps work alive past the response without holding it: handed to the
 * platform when it has waitUntil, otherwise awaited for at most
 * BACKGROUND_DEADLINE_MS. Work still running after the deadline keeps running
 * in this process, but a freeze can cut it short, so only best-effort work
 * belongs here. Writes that a polling client reads back are awaited instead.
 */
export declare function runInBackground(work: Promise<unknown>, waitUntil: WaitUntil | undefined): Promise<void>;