/** @packageDocumentation
 * @module Utilities
 */
/** Uses ECMAScript case transformation (toLowerCase() and toUpperCase()) to check whether or not a given character is a letter.
 * Beyond the English alphabet, this solution will also work for most Greek, Armenian, Cyrillic, and Latin characters.
 * But, it will not work for Chinese or Japanese characters since those languages do not have uppercase and lowercase letters.
 * @alpha
 */
export declare function isLetter(char: string): boolean;
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