Can anyone give me minimal code so that any method I can override for JS method, I tried this code but it doesn't work for me?

I want to override the method for this line https://github.com/odoo/odoo/blob/12.0/addons/im_livechat/static/src/js/website_livechat_window.js#L65

Here is my code file

odoo.define('poc.test', function(require){

"use strict";

console.log('111XXX');

var WebsiteLivechatWindowXXX = require('im_livechat.WebsiteLivechatWindow');

var LivechatWindowTest = WebsiteLivechatWindowXXX.extend({

	events: _.extend(WebsiteLivechatWindowXXX.prototype.events, {

        'input .o_composer_text_field': '_onInputX',

    }),

	/**

     * @override

     * @param {im_livechat.im_livechat.LivechatButton} parent

     * @param {im_livechat.model.WebsiteLivechat} thread

     */

	init: function (parent, thread) {

        this._super.apply(this, arguments);

        this._thread = thread;

    },

	//--------------------------------------------------------------------------

    // Private

    //--------------------------------------------------------------------------

	/**

     * @override

     * @private

     * @param {Object} messageData

     */

	_postMessage: function (messageData) {

		console.log('222XXX');

        this._super.apply(this, arguments);

	},

	_onInputX: function () {

        console.log('this.$input.val().length');

		console.log(this.$input.val().length);

		console.log(this.hasThread());

		console.log(this._thread);

		console.log(this._thread.hasTypingNotification());

	},

});

return LivechatWindowTest;

});

In the console, I can see the log '111XXX' which confirm the JS custom code is loaded but when I tried to send message It doesn't print '222XXX' in the console. Also, If I type anything I got an error message in the console which say 'Error: Couldn't find method '_onInputX' in widget'.
I have included in JS file by creating template view and the template inherit 'inherit_id="website.assets_frontend"' and also I have added depends 'im_livechat' in __manifest__.py file.