import { BindObservableOpts } from './bind-observable-options';
/**
 * Binds a property to an observable companion property.
 * The observable companion property will emit on all assignments (including initialization),
 * but will not emit undefined if undefined is not explicitly assigned on initialization.
 */
export declare function BindObservable(observableKeyOrOpts?: string | BindObservableOpts): (target: any, propertyKey: string) => void;