/** 
based on framer-motion@4.1.17,
Copyright (c) 2018 Framer B.V.
*/
/**
 * Check whether a prop name is a valid `MotionProp` key.
 *
 * @param key - Name of the property to check
 * @returns `true` is key is a valid `MotionProp`.
 *
 * @public
 */
export declare function isValidMotionProp(key: string): boolean;