import type { NotAnErrorBox } from "@lazy-promise/core";
import { LazyPromise } from "@lazy-promise/core";
import type { ReactiveNode } from "alien-signals/system";
export declare const getActiveSub: () => ReactiveNode | undefined;
export declare const setActiveSub: (sub?: ReactiveNode) => ReactiveNode | undefined;
export declare const isSignal: (fn: () => void) => boolean;
export declare const isComputed: (fn: () => void) => boolean;
export declare const isEffect: (fn: () => void) => boolean;
export declare const isEffectScope: (fn: () => void) => boolean;
export declare function signal<T>(): {
    (): T | undefined;
    (value: T | undefined): void;
};
export declare function signal<T>(initialValue: T): {
    (): T;
    (value: T): void;
};
export declare const computed: <T>(getter: (previousValue?: T) => T extends LazyPromise<any, any> ? LazyPromise<NotAnErrorBox, undefined> : T) => (() => T);
export declare const effect: (fn: () => void | (() => void) | LazyPromise<NotAnErrorBox, undefined>) => (() => void);
export declare const effectScope: (fn: () => void) => (() => void);
export declare const trigger: (fn: () => void) => void;
export declare const unbox: <T extends NotAnErrorBox>(getter: () => LazyPromise<T, undefined>) => (() => T | undefined);