/**
 * Convert title to id which contains [a-z0-9] characters and non-number-prefix.
 * @return:
 *  Hello World => hello_world
 *  000 Hello World => hello_world
 */
export declare const generateId: (title: string, prefix?: string) => string;
/**
 * Convert title to id which contains [a-zA-Z0-9] characters and non-number-prefix.
 * @return:
 *  Hello World => Hello_World
 *  000 Hello World => Hello_World
 */
export declare const convertToId: (text: string) => string;
/**
 * Convert title to string which contains [a-zA-Z0-9] characters and non-number-prefix.
 * @return:
 *  Hello World => Hello World
 *  000 Hello  World => Hello World
 */
export declare const convertToString: (text: string) => string;
