/** An SMTP reply — one 3-digit code with one or more continuation lines. */
export interface SmtpReply {
	code: number;
	lines: string[];
	raw: string;
}
/** Incremental parser for SMTP replies. Feed it chunks via `push()`; it
*  invokes `onReply` once per complete reply and leaves any trailing
*  partial line buffered for the next chunk.
*
*  Multi-line replies look like:
*    250-size 10240000\r\n
*    250-auth login plain\r\n
*    250 ok\r\n
*  (Hyphen after the code means "continuation"; space means "last line".)
*/
export declare class ReplyParser {
	private buffer;
	private lines;
	private code;
	private readonly onReply;
	constructor(onReply: (reply: SmtpReply) => void);
	push(chunk: string): void;
	private consumeLine;
	/** Bytes received but not yet forming a complete line — useful for tests. */
	get pending(): string;
}