/**
 * A representation of a leaseholder who is identified by a username, hostname, and process id (PID). This implementation
 * is serializable to/from a JSON object and is comparable to other leaseholders.
 */
export declare class LockHolder {
    /** The user's identity which is typically the OS login username. */
    private readonly _username;
    /** The machine's identity which is typically the hostname. */
    private readonly _hostname;
    /** The process identifier which is typically the OS PID. */
    private readonly _processId;
    /**
     * Constructs a new leaseholder with the given username, hostname, and process id. This constructor is private and
     * should not be called directly. Use the static factory methods to create a new instance.
     *
     * @param username - the user's identity.
     * @param hostname - the machine's identity.
     * @param processId - the process identifier.
     */
    private constructor();
    /**
     * Creates a new leaseholder with the given username. The hostname is set to the current machine's hostname and the
     * process id is set to the current process's PID.
     * @param username - the user's identity.
     * @returns a new leaseholder instance.
     */
    static of(username: string): LockHolder;
    /**
     * Creates a new leaseholder by retrieving the current user's identity, the current machine's hostname, and the
     * current process's PID.
     * @returns a new leaseholder instance.
     */
    static default(): LockHolder;
    /**
     * The user's identity which is typically the OS login username.
     * @returns the user's identity.
     */
    get username(): string;
    /**
     * The machine's identity which is typically the hostname.
     * @returns the machine's identity.
     */
    get hostname(): string;
    /**
     * The process identifier which is typically the OS PID.
     * @returns the process identifier.
     */
    get processId(): number;
    /**
     * Returns a plain object representation of this leaseholder. This object may be serialized to JSON.
     * @returns a plain object representation of this leaseholder.
     */
    toObject(): any;
    /**
     * Compares this leaseholder to another leaseholder to determine if they are equal. Two leaseholders are equal if
     * their username, hostname, and process id are the same.
     * @param other - the other leaseholder to compare.
     * @returns true if the leaseholders are equal; false otherwise.
     */
    equals(other: LockHolder): boolean;
    /**
     * Compares this leaseholder to another leaseholder to determine if they are the same machine. Two leaseholders are
     * the same machine if their username and hostname are the same.
     * @param other - the other leaseholder to compare.
     * @returns true if the leaseholders are the same machine; false otherwise.
     */
    isSameMachineIdentity(other: LockHolder): boolean;
    /**
     * Determines if the process associated with this leaseholder is still alive. This method will return false if the
     * process is not alive or an error occurs while checking the process status.
     * @returns true if the process is alive; false otherwise.
     */
    isProcessAlive(): boolean;
    /**
     * Serializes this leaseholder to a JSON string representation.
     * @returns a JSON string representation of this leaseholder.
     */
    toJson(): string;
    /**
     * Deserializes a JSON string representation of a leaseholder into a new leaseholder instance.
     * @param json - the JSON string representation of a leaseholder.
     * @returns a new leaseholder instance.
     */
    static fromJson(json: string): LockHolder;
}