/**
 * Perfect Reactivity - Signal
 *
 * Reactive data source that notifies subscribers when its value changes.
 */
import type { Link, SignalNode } from './core';
/**
 * Signal - mutable reactive data source
 *
 * @template T - Value type
 *
 * @example
 * ```ts
 * const count = signal(0);
 * count.write(count.read() + 1);
 * ```
 */
export declare class ISignal<T = any> implements SignalNode {
    value: any;
    subs: Link | null;
    subsTail: Link | null;
    version: number;
    constructor(initialValue: T);
    /**
     * Read signal value and track dependency in current reactive context
     *
     * @returns Current value
     */
    read(): T;
    /**
     * Write new value and propagate changes to subscribers
     *
     * @param value - New value
     */
    write(value: T): void;
    /**
     * Read value without tracking dependency
     *
     * @returns Current value
     */
    peek(): T;
}
/**
 * Create a new signal
 *
 * @template T - Value type
 * @param initialValue - Initial value
 * @returns Signal instance
 *
 * @example
 * ```ts
 * const count = signal(0);
 * const name = signal('Alice');
 * ```
 */
export declare function signal<T>(initialValue: T): ISignal<T>;