/**
 * @param {number} code - a UTF-16 code unit
 * @return {boolean}
 */
export declare function isAsciiDigit(code: number): boolean;
/**
 * @param {string} digits - the text after the `#` of a hash
 * @return {boolean} whether it has the length of a hex colour (3, 4, 6 or 8)
 * and only hexadecimal digits
 */
export declare function isHexColorDigits(digits: string): boolean;
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