import { type ObservableLike, Observable } from "./Observable.js";
export declare class TimeoutError extends Error {
    readonly name = "TimeoutError";
}
/**
 * Causes an observable to error if a value is not emitted within the specified
 * timeout limit. The timer resets every time a value is emitted.
 */
export declare function timeout<T>(milliseconds: number, callback?: (error: TimeoutError) => ObservableLike<T>): (observable: ObservableLike<T>) => Observable<T>;
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