import { FileHandle } from "fs/promises";
import { ApplicationCredentials } from "../schemas/application-credentials.js";
import { StoredCredentials } from "../schemas/credentials.js";
export declare class StorageService {
    private readonly configDir;
    private resolve;
    private ensureConfigDir;
    /**
     * Saves application credentials to application.json file.
     */
    saveApplication(credentials: ApplicationCredentials): Promise<void>;
    /**
     * Loads application credentials from application.json file.
     * Returns null if file doesn't exist or is invalid.
     */
    loadApplication(): Promise<ApplicationCredentials | null>;
    /**
     * Saves consumer key credentials to credentials.json file.
     */
    saveCredentials(credentials: StoredCredentials): Promise<void>;
    /**
     * Loads consumer key credentials from credentials.json file.
     * Returns null if file doesn't exist or is invalid.
     */
    loadCredentials(): Promise<StoredCredentials | null>;
    /**
     * Loads consumer key credentials from credentials.json.
     * Throws CredentialsNotFoundException if file doesn't exist.
     */
    requireCredentials(): Promise<StoredCredentials>;
    /**
     * Creates an async iterable stream of lines from a .env file.
     * Returns empty async iterable if file doesn't exist.
     */
    streamEnvironmentLines(): AsyncIterable<string>;
    /**
     * Creates a swap file for atomic .env file operations.
     * Returns a file handle for writing. Throws exception if swap file already exists.
     */
    createEnvironmentSwapFile(): Promise<FileHandle>;
    /**
     * Atomically replaces .env file with the swap file.
     */
    activateEnvironmentSwapFile(): Promise<void>;
}