react-understate/dist/core.d.ts

A lightweight, reactive signals library for React 18+ with automatic dependency tracking and optimized performance

interface State<T> {
    readonly rawValue: T;
    update(fn: (prev: T) => T | Promise<T>): Promise<void>;
    subscribe(fn: () => void): () => void;
    get value(): T;
    set value(newValue: T | ((prev: T) => T | Promise<T>));
    get requiredValue(): NonNullable<T>;
    set requiredValue(newValue: NonNullable<T>);
}
declare function state<T>(initialValue: T, name?: string): State<T>;
declare function batch(fn: () => void, name?: string): void;

declare function derived<T>(computeFn: () => T, name?: string): State<T>;

type EffectOptions = {
    once?: boolean;
    preventOverlap?: boolean;
    preventLoops?: boolean;
};
declare function effect(fn: () => void | (() => void) | Promise<void> | Promise<() => void>, name?: string, options?: EffectOptions): () => void;

export { batch, derived, effect, state };
export type { State };