/**
 * Tracks one-shot request/response pairs over the `postMessage` bridge. Each `allocate` reserves a
 * unique `requestId` and stores its resolver. `resolve` finds the pending resolver by `requestId`
 * and calls it, then removes the entry so the same `requestId` cannot be resolved twice.
 */
export declare class PendingRequests<T> {
    private readonly prefix;
    private nextId;
    private readonly entries;
    constructor(prefix: string);
    allocate(resolver: (value: T) => void): string;
    resolve(requestId: string, value: T): boolean;
}
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