import type { ObservableOptions, Observable } from '../types.js';
declare function observable<T>(): Observable<T | undefined>;
declare function observable<T>(value: undefined, options?: ObservableOptions<T | undefined>): Observable<T | undefined>;
declare function observable<T extends boolean>(value: boolean, options?: ObservableOptions<T>): Observable<T>;
declare function observable<T extends number>(value: number, options?: ObservableOptions<T>): Observable<T>;
declare function observable<T extends string>(value: string, options?: ObservableOptions<T>): Observable<T>;
declare function observable<T>(value: T, options?: ObservableOptions<T>): Observable<T>;
export default observable;