/** The checkContrast function returns the status of a contrast ratio based on
 * the WCAG 2.1 standards.  WCAG Level AA requires a contrast ratio of at least
 * 4.5:1 for normal text and 3:1 for large text. WCAG Level AAA requires a
 * contrast ratio of at least 7:1 for normal text and 4.5:1 for large text. */
export declare const checkContrast: (ratio: any) => any[];