export type StateChannelListener<T> = (value: T) => void;
export interface StateChannelSubscription {
    unsubscribe: () => void;
}
export declare class StateChannel<T> {
    private value;
    private listeners;
    constructor(value: T);
    getValue(): T;
    setValue(value: T): void;
    update(updater: (current: T) => T): void;
    subscribe(listener: StateChannelListener<T>): StateChannelSubscription;
    private emit;
}