import type { IProtocolMessage } from './protocol.types.js';
/**
 * ProtocolParser parses Protocol V2 messages
 * This class is used by tstest to parse test results from the new protocol format
 */
export declare class ProtocolParser {
    private protocolVersion;
    private inBlock;
    private blockType;
    private blockContent;
    /**
     * Parse a single line and return protocol messages
     */
    parseLine(line: string): IProtocolMessage[];
    /**
     * Parse protocol version header
     */
    private parseProtocolVersion;
    /**
     * Parse TAP version line
     */
    private parseTapVersion;
    /**
     * Parse plan line
     */
    private parsePlan;
    /**
     * Parse bailout
     */
    private parseBailout;
    /**
     * Parse event
     */
    private parseEvent;
    /**
     * Check if line is a comment
     */
    private isComment;
    /**
     * Parse test result line
     */
    private parseTestResult;
    /**
     * Extract inline metadata from line
     */
    private extractInlineMetadata;
    /**
     * Remove inline metadata from line
     */
    private removeInlineMetadata;
    /**
     * Extract protocol data with specific prefix
     */
    private extractProtocolData;
    /**
     * Check if line starts a block
     */
    private isBlockStart;
    /**
     * Check if line ends a block
     */
    private isBlockEnd;
    /**
     * Extract block type from start line
     */
    private extractBlockType;
    /**
     * Finalize current block
     */
    private finalizeBlock;
    /**
     * Escape regex special characters
     */
    private escapeRegex;
    /**
     * Get protocol version
     */
    getProtocolVersion(): string | null;
}