/**
 * Checks if a string is a valid JSON string.
 *
 * @param {string} v - The string to be checked.
 * @param {boolean=} almost - If true, only checks if the string is almost JSON-like. Defaults to false.
 * @returns {boolean} - Returns true if the string is valid JSON, false otherwise.
 *
 * @example
 * isJson('{"name": "John", "age": 30}'); // true
 * isJson('[1, 2, 3]'); // true
 * isJson('{"name": "John", "age": 30'); // false
 * isJson('This is not a JSON string.'); // false
 */
export function isJson(v: string, almost?: boolean | undefined): boolean;
export default isJson;