import { Accessor, Setter } from "./signal.js";
declare global {
  interface SymbolConstructor {
    readonly observable: symbol;
  }
}
interface Observable<T> {
  subscribe(observer: ObservableObserver<T>): {
    unsubscribe(): void;
  };
  [Symbol.observable](): Observable<T>;
}
export type ObservableObserver<T> =
  | ((v: T) => void)
  | {
      next?: (v: T) => void;
      error?: (v: any) => void;
      complete?: (v: boolean) => void;
    };
/**
 * Creates a simple observable from a signal's accessor to be used with the `from` operator of observable libraries like e.g. rxjs
 * ```typescript
 * import { from } from "rxjs";
 * const [s, set] = createSignal(0);
 * const obsv$ = from(observable(s));
 * obsv$.subscribe((v) => console.log(v));
 * ```
 * description https://docs.solidjs.com/reference/reactive-utilities/observable
 */
export declare function observable<T>(input: Accessor<T>): Observable<T>;
type Producer<T> =
  | ((setter: Setter<T>) => () => void)
  | {
      subscribe: (fn: (v: T) => void) =>
        | (() => void)
        | {
            unsubscribe: () => void;
          };
    };
export declare function from<T>(producer: Producer<T>, initalValue: T): Accessor<T>;
export declare function from<T>(producer: Producer<T | undefined>): Accessor<T | undefined>;
export {};