interface String {
	/**
	 * @from `@dulysse1/better-node`
	 * ### Capitalize your string
	 * @param firstChar Does the first character have to be capitalized ?
	 * @default true
	 * @param sep Your capitalize separator
	 * @returns {string} Your string capitalized
	 */
	capitalized<T extends "-" | "_" | " ">(sep?: T, firstChar?: boolean): string;
}