/**
 * Content validator for ContentUnit integrity checking
 * @module content/validator/ContentValidator
 */
import type { IValidator, ValidationResult } from './IValidator.js';
import type { ContentUnit } from '../types.js';
/**
 * Validates ContentUnit for structural integrity
 *
 * Checks for:
 * - Balanced indexed tags (`<1>...</1>`)
 * - Valid tag indices (no invalid/malformed tags)
 * - Style references (styles referenced by tags exist)
 * - Orphan styles (styles defined but not used)
 * - Basic ICU brace balance validation
 *
 * @example
 * ```typescript
 * const validator = new ContentValidator();
 *
 * // Valid unit
 * const valid = validator.validate({
 *   text: 'Hello <1>world</1>',
 *   styles: { '1': ['raw:<b>'] }
 * });
 * // → { valid: true, errors: [], warnings: [] }
 *
 * // Unbalanced tags
 * const invalid = validator.validate({
 *   text: 'Hello <1>world',
 *   styles: { '1': ['raw:<b>'] }
 * });
 * // → { valid: false, errors: [{ code: 'UNBALANCED_TAGS', ... }], ... }
 * ```
 */
export declare class ContentValidator implements IValidator {
    /**
     * Validate a ContentUnit for structural integrity
     *
     * @param unit - ContentUnit to validate
     * @returns Validation result with errors and warnings
     */
    validate(unit: ContentUnit): ValidationResult;
    /**
     * Validate that all indexed tags are properly balanced and correctly nested
     */
    private validateTagBalance;
    /**
     * Validate style references - check that used tags have styles and vice versa
     */
    private validateStyleReferences;
    /**
     * Validate ICU MessageFormat brace balance
     */
    private validateICUBraces;
}
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