/**
 * Parses a single CSV line into an array of fields.
 * Handles quoted fields, escaped quotes, and custom delimiters.
 *
 * @param input - The CSV line to parse.
 * @param delimiter - Field delimiter (default: ",").
 * @param quote - Quote character (default: '"').
 * @returns An array of parsed fields.
 *
 * @throws {Error} If input is empty.
 * @throws {Error} If delimiter or quote is not exactly one character.
 * @throws {Error} If quotes are not properly closed.
 *
 * @example
 * // Basic usage
 * parseCSVLine("a,b,c"); // Returns ["a", "b", "c"]
 *
 * @example
 * // Quoted fields
 * parseCSVLine('a,"b,c",d'); // Returns ["a", "b,c", "d"]
 *
 * @example
 * // Escaped quotes
 * parseCSVLine('a,"b""c",d'); // Returns ["a", 'b"c', "d"]
 *
 * @example
 * // Custom delimiter
 * parseCSVLine("a|b|c", "|"); // Returns ["a", "b", "c"]
 *
 * @example
 * // Empty fields
 * parseCSVLine("a,,c"); // Returns ["a", "", "c"]
 *
 * @note This function follows RFC 4180 CSV parsing rules.
 * Quoted fields can contain delimiters and newlines.
 * Quotes within quoted fields must be escaped by doubling them.
 *
 * @complexity Time: O(n), Space: O(n) - Where n is the length of input string
 */
export declare function parseCSVLine(input: string, delimiter?: string, quote?: string): string[];
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