# whatsapp-web.js 1.2.1-post » Source: util/Constants.js

    'use strict';

    exports.WhatsWebURL = 'https://web.whatsapp.com/';

    exports.UserAgent = 'Mozilla/5.0 (Macintosh; Intel Mac OS X 10_14_0) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/72.0.3626.109 Safari/537.36';

    exports.DefaultOptions = {
        puppeteer: {
            headless: true
        },
        session: false
    };

    /**
     * Client status
     * @readonly
     * @enum {number}
     */
    exports.Status = {
        INITIALIZING: 0,
        AUTHENTICATING: 1,
        READY: 3
    };

    /**
     * Events that can be emitted by the client
     * @readonly
     * @enum {string}
     */
    exports.Events = {
        AUTHENTICATED: 'authenticated',
        AUTHENTICATION_FAILURE: 'auth_failure',
        READY: 'ready',
        MESSAGE_RECEIVED: 'message',
        MESSAGE_CREATE: 'message_create',
        MESSAGE_REVOKED_EVERYONE: 'message_revoke_everyone',
        MESSAGE_REVOKED_ME: 'message_revoke_me',
        MESSAGE_ACK: 'message_ack',
        GROUP_JOIN: 'group_join',
        GROUP_LEAVE: 'group_leave',
        GROUP_UPDATE: 'group_update',
        QR_RECEIVED: 'qr',
        DISCONNECTED: 'disconnected',
        STATE_CHANGED: 'change_state',
    };

    /**
     * Message types
     * @readonly
     * @enum {string}
     */
    exports.MessageTypes = {
        TEXT: 'chat',
        AUDIO: 'audio',
        VOICE: 'ptt',
        IMAGE: 'image',
        VIDEO: 'video',
        DOCUMENT: 'document',
        STICKER: 'sticker',
        LOCATION: 'location',
        CONTACT_CARD: 'vcard',
        CONTACT_CARD_MULTI: 'multi_vcard',
        REVOKED: 'revoked',
        UNKNOWN: 'unknown'
    };

    /**
     * Group notification types
     * @readonly
     * @enum {string}
     */
    exports.GroupNotificationTypes = {
        ADD: 'add',
        INVITE: 'invite',
        REMOVE: 'remove',
        LEAVE: 'leave',
        SUBJECT: 'subject',
        DESCRIPTION: 'description',
        PICTURE: 'picture',
        ANNOUNCE: 'announce',
        RESTRICT: 'restrict',
    };

    /**
     * Chat types
     * @readonly
     * @enum {string}
     */
    exports.ChatTypes = {
        SOLO: 'solo',
        GROUP: 'group',
        UNKNOWN: 'unknown'
    };

    /**
     * WhatsApp state
     * @readonly
     * @enum {string}
     */
    exports.WAState = {
        CONFLICT: 'CONFLICT',
        CONNECTED: 'CONNECTED',
        DEPRECATED_VERSION: 'DEPRECATED_VERSION',
        OPENING: 'OPENING',
        PAIRING: 'PAIRING',
        PROXYBLOCK: 'PROXYBLOCK',
        SMB_TOS_BLOCK: 'SMB_TOS_BLOCK',
        TIMEOUT: 'TIMEOUT',
        TOS_BLOCK: 'TOS_BLOCK',
        UNLAUNCHED: 'UNLAUNCHED',
        UNPAIRED: 'UNPAIRED',
        UNPAIRED_IDLE: 'UNPAIRED_IDLE'
    };

    /**
     * Message ACK
     * @readonly
     * @enum {number}
     */
    exports.MessageAck = {
        ACK_ERROR: -1,
        ACK_PENDING: 0,
        ACK_SERVER: 1,
        ACK_DEVICE: 2,
        ACK_READ: 3,
        ACK_PLAYED: 4,
    };