import { CBFileSystem } from "../node/file-system";
/**
 * Package validator for validating app structure.
 * This primarily validates the app directory and the structure of the app which developer bundles and uploads to Chargebee.
 */
export declare class PackageValidator {
    private fileSystem;
    constructor(fileSystem: CBFileSystem);
    /**
     * Validates that the app directory exists
     * @param {string} targetDir - Target directory path
     * @returns {boolean} True if directory exists
     */
    validateAppDirectoryExists(targetDir: string): boolean;
    /**
     * Validates that manifest.json exists in the app directory
     * @param {string} targetDir - Target directory path
     * @returns {boolean} True if manifest.json exists
     */
    validateManifestExists(targetDir: string): boolean;
    /**
     * Validates that handler.js exists in the app directory
     * @param {string} targetDir - Target directory path
     * @returns {boolean} True if handler.js exists
     */
    validateHandlerExists(targetDir: string): boolean;
}