/**
 * This file contains specific YINI helper functions (utils).
 * @note More general helper functions should go into the dir "src/utils/".
 */
/**
 * Check if the character is a section marker character.
 * @param character A character in a string.
 * @note The string must be of length 1.
 * @throws Will throw if not exactly of length 1.
 */
export declare const isMarkerCharacter: (character: string) => boolean;
/**
 * @returns Returns the beginning up to (but not including) any comments
 * starting with //, #, ; or --.
 * @throws Will throw if consisting more than 1 lines.
 */
export declare const stripCommentsAndAfter: (line: string) => string;
/**
 * Checks if a string conforms to the identifier rules for section headers and
 * member key names as defined by the YINI specification, following
 * the ANTLR4 lexer rule:
 * IDENT: ('a'..'z' | 'A'..'Z' | '_') ('a'..'z' | 'A'..'Z' | '0'..'9' | '_')*

* @throws Will only throw if blank string.
 *
 * @satisfies Should satisfy YINI spec 7, chapter: 3.4. Identifiers, Form 1:
 * Identifier of Simple Form.
 * @link https://github.com/YINI-lang/YINI-spec/blob/develop/YINI-Specification.md#34-identifiers
 */
export declare const isValidSimpleIdent: (str: string) => boolean;
/**
 * Checks if a string is a valid backticked phrase/identifier:
 * - Wrapped in backticks.
 * - No raw tabs, newlines, or control characters (U+0000–U+001F), except as
 *   escaped sequences (e.g., \n).
 * - May contain ordinary spaces.
 * @note Empty is allowed: ``, as in spec (due to conform with the JSON empty key "").
 * @throws Will only throw if missing enclosed backtick(s).
 *
 * @satisfies Should satisfy YINI spec 7, chapter: 3.4. Identifiers, Form 2:
 * Backticked Identifier.
 * @link https://github.com/YINI-lang/YINI-spec/blob/develop/YINI-Specification.md#34-identifiers
 */
export declare const isValidBacktickedIdent: (str: string) => boolean;