/**
 * Checks if string is a valid JSON string
 * @param str{String} - source String
 * @return {Boolean}
 * @example
 * // How to check if string is a JSON?
 * const str = '{ "hello": "world" }';
 * const isStrJSON = isJSON(str);
 * console.log(isStrJSON); // => true
 */
export function isJSON(str: string): boolean;
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