/**
 * A collection of String-based constants.
 * @hidden
 * @ignore Exclude from docs
 */
/**
 * @ignore Exclude from docs
 */
export declare let PX: string;
/**
 * @ignore Exclude from docs
 */
export declare let STRING: string;
/**
 * @ignore Exclude from docs
 */
export declare let NUMBER: string;
/**
 * @ignore Exclude from docs
 */
export declare let DATE: string;
/**
 * @ignore Exclude from docs
 */
export declare let DURATION: string;
/**
 * @ignore Exclude from docs
 */
export declare let PLACEHOLDER: string;
/**
 * @ignore Exclude from docs
 */
export declare let PLACEHOLDER2: string;