/**
 * Keystore management for IoTeX accounts
 */
import { KeystoreAccount } from '../types';
export declare class Keystore {
    private keystoreDir;
    constructor(keystoreDir?: string);
    /**
     * Ensure keystore directory exists
     */
    private ensureKeystoreDir;
    /**
     * Get keystore file path for an address
     */
    private getKeystoreFilePath;
    /**
     * Create a new account and save to keystore
     */
    create(password: string): Promise<{
        address: string;
        privateKey: string;
    }>;
    /**
     * Import a private key into keystore
     */
    importKey(privateKey: string, password: string): Promise<string>;
    /**
     * Export private key from keystore
     */
    exportKey(address: string, password: string): Promise<string>;
    /**
     * Delete an account from keystore
     */
    delete(address: string): Promise<void>;
    /**
     * List all accounts in keystore
     */
    list(): KeystoreAccount[];
    /**
     * Check if an account exists in keystore
     */
    exists(address: string): boolean;
    /**
     * Update password for an account
     */
    updatePassword(address: string, oldPassword: string, newPassword: string): Promise<void>;
    /**
     * Get keystore directory path
     */
    getKeystoreDir(): string;
    /**
     * Sign a message with account from keystore
     */
    signMessage(address: string, password: string, message: string): Promise<string>;
}
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