interface DedupeAsyncOptions<TArgs extends unknown[]> {
    /**
     * Optional callback invoked when a duplicate call is detected. The first
     * caller's invocation runs normally; this fires for the 2nd, 3rd, …
     * Useful for logging "shutdown already in progress; ignoring duplicate
     * signal".
     *
     * Receives the *duplicate* call's args (not the first call's). The first
     * call's args are what the wrapped function actually ran with — duplicates
     * are intentionally short-circuited and their args are dropped from
     * execution but surfaced here for logging.
     */
    onDuplicate?: (...args: TArgs) => void;
}
export declare function dedupeAsync<TArgs extends unknown[], TResult>(fn: (...args: TArgs) => Promise<TResult>, options?: DedupeAsyncOptions<TArgs>): (...args: TArgs) => Promise<TResult>;
export {};
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