/**
 * Escape special characters in a TEXT property value.
 *
 * Note: This method converts both CRLF and LF to '\n'.
 * @param value The property value to escape.
 * @returns The escaped property value.
 * @see {@link unescapeTextPropertyValue}
 */
export declare function escapeTextPropertyValue(value: string): string;
/**
 * Unescape special characters in a TEXT property value.
 * @param value The property value to unescape.
 * @returns The unescaped property value.
 * @throws If the value contains a bad escaped character, i.e., a character that should not be escaped after a backslash.
 * @see {@link unescapeTextPropertyValue}
 */
export declare function unescapeTextPropertyValue(value: string): string;
/**
 * Escape a property parameter value.
 * @param param The parameter value to escape.
 * @returns The escaped parameter value.
 * @throws If the parameter value contains a DQUOTE (") character.
 * @see {@link unescapePropertyParameterValue}
 */
export declare function escapePropertyParameterValue(param: string): string;
/**
 * Unescape a property parameter value.
 * @param param The parameter value to unescape.
 * @returns The unescaped parameter value.
 * @see {@link escapePropertyParameterValue}
 */
export declare function unescapePropertyParameterValue(param: string): string;
export declare const MAX_LINE_LENGTH = 75;
/**
 * Fold a single line as specified in RFC 5545 3.1.
 * @param line The line to fold.
 * @returns The folded line.
 */
export declare function foldLine(line: string): string;
/**
 * Unfold a single line as specified in RFC 5545 3.1.
 * @param lines The lines to unfold.
 * @returns The unfolded line.
 */
export declare function unfoldLine(lines: string): string;
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