/**
 * Output Compression Service
 *
 * RTK-style content-aware compression for terminal command output.
 * Applies per-command intelligent filters to reduce token consumption
 * while preserving the most useful information for the LLM.
 *
 * Design:
 * - ANSI codes are always stripped (zero semantic value, 5-15% overhead)
 * - Short outputs (< OUTPUT_COMPRESSION_THRESHOLD) pass through unchanged
 * - Per-command filters reduce structure-specific noise (git metadata, pass
 *   suites, progress spinners, duplicate type errors, etc.)
 * - truncateTerminalOutput() acts as a safety net after compression; it is
 *   never skipped so the MAX_TERMINAL_OUTPUT_CHARS cap always holds
 */
export type CompressionStrategy = (output: string, command: string) => string;
export declare function getStrategy(tool: string): CompressionStrategy | undefined;
export declare function registerStrategy(tool: string, fn: CompressionStrategy): void;
export declare function resetRegistry(): void;
interface CompressionStats {
    calls: number;
    inputChars: number;
    outputChars: number;
}
/**
 * Returns a snapshot of terminal output compression statistics for the current
 * process lifetime. Counts only calls that triggered actual compression
 * (outputs above OUTPUT_COMPRESSION_THRESHOLD).
 */
export declare function getCompressionStats(): Readonly<CompressionStats>;
/**
 * Reset compression statistics. Called by session cleanup and tests.
 */
export declare function resetCompressionStats(): void;
/**
 * Strip ANSI escape sequences from text.
 * Safe to call on any string — no-op when no escape codes are present.
 */
export declare function stripAnsiCodes(text: string): string;
/**
 * Truncate output to MAX_TERMINAL_OUTPUT_CHARS using head+tail strategy.
 * When the omitted middle contains priority lines (errors, failures), up to
 * 2 000 chars of those lines are surfaced before the omission notice.
 */
export declare function truncateTerminalOutput(output: string): string;
/**
 * Compress terminal command output using content-aware per-command filters.
 *
 * Steps:
 * 1. Strip ANSI codes unconditionally.
 * 2. Return unchanged if output is below OUTPUT_COMPRESSION_THRESHOLD.
 * 3. Apply a per-command filter keyed on the first token of `command`.
 *    Unknown commands pass through without transformation.
 * 4. Apply head+tail truncation as a final safety net.
 */
export declare function compressTerminalOutput(command: string, output: string): string;
export {};
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