/**
 * Get the first character of a value.
 *
 * Is aware of astral characters (such as emoji).
 *
 * @param {string} value
 *   Value.
 * @returns {string}
 *   First character; empty if `value` is empty.
 */
export function firstCharacter(value: string): string;
/**
 * Get the last character of a value.
 *
 * Is aware of astral characters (such as emoji).
 *
 * @param {string} value
 *   Value.
 * @returns {string}
 *   Last character; empty if `value` is empty.
 */
export function lastCharacter(value: string): string;
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