import type { LintError } from '../lint.types.js';
/**
 * @purpose Validates anchor pairing and nesting in TypeScript source per DbC contract.
 * @invariant Stack-based: START_X pushes; END_X finds matching START_X in stack and reports nesting for any unclosed blocks above the match.
 * @invariant Bare #region/#endregion without START_/END_ → ERR_CLI_LINT_ANCHOR_MALFORMED. Bare #endregion auto-closes with stack top.
 * @invariant Pure function — no I/O, no exceptions. Errors returned in ascending line order.
 * @param content Source text to validate.
 * @param filePath File path for error messages.
 * @returns List of lint errors in line order, empty when anchors are correctly paired and nested.
 */
export declare function check(content: string, filePath: string): LintError[];