/**
 * Checks if a string written in snake_case
 * @param str{String} - source string
 * @return {Boolean}
 * @see https://developer.mozilla.org/en-US/docs/Glossary/Snake_case
 * @example
 * // How to check if a string is in snake_case?
 * const str = "my_string";
 * const isSnake = isStrInSnakeCase(str);
 * console.log(isSnake); // => true
 */
export function isStrInSnakeCase(str: string): boolean;
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