import type { EnhancedTranslationFile, FormatOptions, IFormatHandler, ValidationResult } from "../format.interface.js";
import type { TranslationFile } from "../translate.interface.js";
export declare class PropertiesHandler implements IFormatHandler {
    canHandle(filePath: string, content?: string): boolean;
    parse(content: string): EnhancedTranslationFile;
    serialize(data: EnhancedTranslationFile, options?: FormatOptions): string;
    getFileExtension(): string;
    validateStructure(data: TranslationFile): ValidationResult;
    private detectEncoding;
    private hasUnicodeEscapes;
    private unescapeUnicode;
    private normalizeEncoding;
    private extractComments;
    private extractFormatting;
    private escapeKey;
    private escapeValue;
    private applyUnicodeEscaping;
    private escapeUnicode;
    private isValidPropertyKey;
    private containsPlaceholders;
    private extractPlaceholders;
    private validatePlaceholderIntegrity;
    private analyzePlaceholders;
    private categorizePlaceholders;
    private isValidPlaceholderSyntax;
}