export default class ReactiveDependency<T> {
    private _accessor;
    addDependency: (targetObj: Text | HTMLElement, dep: (() => void)) => void;
    get value(): T;
    set value(val: T);
    constructor(_accessor: {
        get: () => T;
        set: (val: T) => void;
    }, addDependency: (targetObj: Text | HTMLElement, dep: (() => void)) => void);
    derive<U>(fn: (value: T) => U): ReactiveDependency<U>;
}