import type { LintError } from '../lint.types.js';
/**
 * @purpose Detects #region START / #endregion END blocks with fewer than 2 meaningful lines
 *         of code. Regions wrapping only comments should be replaced with plain comments.
 * @invariant Meaningful line = non-empty, non-`//`-comment, non-region-marker.
 * @invariant Nested regions: code inside inner regions counts toward outer region totals.
 * @param content Source text to validate.
 * @param filePath File path for error messages.
 * @returns List of lint errors, empty when all regions have sufficient content.
 */
export declare function check(content: string, filePath: string): LintError[];