import { Component } from './component';

export declare const SUSPENSE_CONTEXT: unique symbol;
export type SuspenseContext = {
    start: () => void;
    end: () => void;
};
/**
 * Track a promise within a suspense boundary.
 *
 * Calls `start()` on the nearest suspense context when invoked,
 * and `end()` when the promise settles (resolves or rejects).
 *
 * The promise is also registered with the destructor tree so that
 * component destruction waits for pending async operations.
 *
 * @param ctx - The component context to find the suspense boundary from
 * @param promise - The promise to track
 * @returns A promise that resolves/rejects with the same value as the input,
 *          but guarantees that `end()` has been called when awaited
 *
 * @example
 * ```ts
 * const data = await followPromise(this, fetch('/api/data'));
 * // At this point, suspense end() has been called
 * ```
 */
export declare function followPromise<T extends Promise<any>>(ctx: Component<any>, promise: T): Promise<Awaited<T>>;