/** Input metrics for horizon detection. */
export interface HorizonInput {
    readonly contentLines: number;
    readonly contentBytes: number;
    readonly outlineLines: number;
    readonly outlineBytes: number;
}
/** Result of horizon detection. */
export interface HorizonResult {
    readonly horizonReached: boolean;
    readonly compressionRatio: number;
    readonly recommendation: "outline" | "content";
    readonly message?: string;
}
/**
 * Detect whether the readability horizon has been reached.
 *
 * When the outline is nearly as large as the content (compression
 * ratio > threshold), the file is irreducibly complex for the
 * outline representation. Return full content instead.
 */
export declare function detectReadabilityHorizon(input: HorizonInput): HorizonResult;
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