export interface ReadableStore<T> {
    /** Svelte store contract: subscribe, get an unsubscribe back. */
    subscribe: (run: (value: T) => void) => () => void;
}
export interface WritableStore<T> extends ReadableStore<T> {
    set: (value: T) => void;
    get: () => T;
}
/**
 * `onActiveChange` mirrors Svelte's own start/stop notifier: it is called with
 * `true` when the store gains its first subscriber and `false` when it loses
 * its last (e.g. the `$store` auto-subscription of a destroyed component).
 */
export declare const writable: <T>(initial?: T, onActiveChange?: (active: boolean) => void) => WritableStore<T>;
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