/**
 * @param {string} text
 * @returns {string}
 */
export function firstCharToUpperCase(text: string): string;
/**
 * @param {string} string
 * @param {string[]} candidates
 * @returns {string}
 */
export function getLongestSubstring(string: string, candidates: string[]): string;
/**
 * @param {any} s
 * @returns {boolean}
 */
export function isString(s: any): boolean;
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