import type { LintError } from '../lint.types.js';
/**
 * @purpose Streams through the file tracking brace depth and current enclosing entity.
 *         Counts @invariant JSDoc tags and invariant: region comments per entity.
 *         When an entity body closes, checks threshold and emits error if exceeded.
 * @param content Source text to validate.
 * @param filePath File path for error messages.
 * @param maxInvariants Threshold — entities with more invariants trigger an error.
 * @returns List of lint errors, empty when all entities are within limit.
 */
export declare function check(content: string, filePath: string, maxInvariants: number): LintError[];