/**
 * First-error window extraction for deployment logs — the shared primitive
 * behind `DeploymentFailure.excerpt` (design § 4). Scans for the first line
 * matching an anchored error-pattern set, keeps a ±N-line window around it,
 * and caps the result. Masks BEFORE any slicing (security-standards
 * "mask before you truncate"); with no anchor it falls back to the TAIL, not
 * the head — the head of a CDK log is its least informative part.
 */
/** Lines of context kept either side of the anchor line. */
export declare const ERROR_WINDOW_CONTEXT_LINES = 20;
export interface ExtractErrorWindowOptions {
    /** Hard cap in UTF-16 code units. Default: `DEPLOYMENT_FAILURE_LIMITS.excerpt`. */
    maxLength?: number;
    /** Context lines kept either side of the anchor line. Default: `ERROR_WINDOW_CONTEXT_LINES`. */
    contextLines?: number;
}
/**
 * Extract a bounded first-error window from a deployment log. Returns the
 * masked log verbatim when it already fits the cap.
 */
export declare function extractErrorWindow(log: string, options?: ExtractErrorWindowOptions): string;