CybroAddons/whatsapp_mail_messaging/static/src/js/mail_button.js

/** @odoo-module **/

import SystrayMenu from 'web.SystrayMenu';
import Widget from 'web.Widget';

const { Component } = owl;

var ActionMenu = Widget.extend({
    template: 'global_mail_message.mail_icon',
    events: {
        'click .mail_icon': 'onclick_mail_icon',
    },
    onclick_mail_icon: function() {
        var self = this;
        self.do_action({
            name: 'Compose Mail',
            res_model: 'mail.compose.message',
            views: [[false, 'form']],
            type: 'ir.actions.act_window',
            view_mode: 'form',
            target: 'new'
        });
    },
});

SystrayMenu.Items.push(ActionMenu);

export default ActionMenu;