/**
 * CompressionConfig — type definitions and defaults for the feature-toggle system.
 *
 * Priority (highest wins): env vars > project config > user config > defaults.
 */
export interface CompressionConfig {
    /** Master switch — when false, all layers are bypassed regardless of their individual settings. */
    enabled: boolean;
    layers: {
        userPromptHook: {
            enabled: boolean;
            engine: 'density-filter' | 'sentence-extractor';
            /** Minimum token count before compression is attempted. */
            threshold: number;
            /** Fraction of content to keep (0–1). */
            keepRatio: number;
        };
        commandOutputHook: {
            enabled: boolean;
            engine: 'command-compressor';
            /** Command names whose output should never be compressed. */
            excludeCommands: string[];
        };
        sdkContextHook: {
            enabled: boolean;
            engine: 'sentence-extractor';
            /** Target fraction to remove (0–1). E.g. 0.15 removes ~15%. */
            targetReduction: number;
            /** Minimum token count before compression is attempted. */
            minCompressionTokens: number;
            /** Per-task-kind overrides for targetReduction. */
            perTaskKind?: {
                agent?: number;
                skill?: number;
                breakpoint?: number;
            };
        };
        processLibraryCache: {
            enabled: boolean;
            engine: 'sentence-extractor';
            /** Target fraction to remove (0–1). */
            targetReduction: number;
            /** How many hours a compressed cache entry remains valid. */
            ttlHours: number;
        };
    };
}
export declare const DEFAULT_COMPRESSION_CONFIG: CompressionConfig;
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