import { type InteropObservableHolder } from './interop-observable';
export interface Observer<A> {
    readonly next: (a: A) => void;
}
export interface Subscription {
    readonly unsubscribe: () => void;
}
export interface Observable<A> {
    readonly subscribe: (observer: Observer<A>) => Subscription;
}
export declare const newObservable: <A>(f: (observer: Observer<A>) => () => void) => Observable<A>;
export declare const subscriptionNone: Subscription;
export declare const never: Observable<never>;
export declare function fromInteropObservable<Value>(source: InteropObservableHolder<Value>): Observable<Value>;
export declare function fromInteropObservable<Value>(source: Observable<Value>): Observable<Value>;