/** A writable reactive signal. Call with no args to read, with a value to write. */
export interface Signal<T> {
    (): T;
    (value: T): void;
    /** Subscribe to future value changes. Returns an unsubscribe function. */
    subscribe(fn: (value: T) => void): () => void;
    /** Read the current value without triggering tracking. */
    peek(): T;
    readonly __isSignal: true;
}
/** A derived, read-only signal. */
export interface ReadonlySignal<T> {
    (): T;
    subscribe(fn: (value: T) => void): () => void;
    peek(): T;
    readonly __isSignal: true;
    readonly __isComputed: true;
}
/**
 * Create a writable signal.
 */
export declare function signal<T>(initial: T, label?: string): Signal<T>;
/**
 * Create a derived read-only signal.
 */
export declare function computed<T>(fn: () => T, label?: string): ReadonlySignal<T>;
/** Type guard — true for both Signal and ReadonlySignal */
export declare function isSignal(value: unknown): value is Signal<unknown> | ReadonlySignal<unknown>;
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