import type { LayoutChangeEvent } from 'react-native';
export type LayoutState = {
    width: number;
    height: number;
    cx: number;
    cy: number;
    radius: number;
};
export declare const useKnobGeometry: (size: number) => {
    layoutState: LayoutState;
    handleLayout: (event: LayoutChangeEvent) => void;
};