Cordova.plugins not found

I’m trying to build an iOS Cordova plugin using Ionic and I’m having problems calling my javascript plugin functions

Error message: Property ‘Mtv’ does not exist on type ‘CordovaPlugins’
when it calls window.cordova.plugins.Mtv
I already tried calling cordova.plugins.Mtv, window.plugins.Mtv, window.Mtv, Mtv, cordova.Mtv and nothing seems to work.

I already runned cordova plugin list in my project and my plugin is added correctly

My code in the ionic project:

import { Component, NgZone, OnInit} from '@angular/core';

declare var cordova: any;

declare var Mtv: any;

  selector: 'app-home',
  templateUrl: '',
  styleUrls: [''],

export class HomePage {

  constructor() {

    window.cordova.plugins.Mtv.provision("paysmart-ionic", "12456754", "12345656", "password", "", this.handleProvisionResponse.bind(this));

  handleProvisionResponse (error, bundleObject) {

In my plugin:

var Mtv = {};

Mtv.provision = function(tokenVaultID, cellPhone, userId, password, email, cb){
    cordova.exec(function(result){ cb(null, result); }, cb, 'Mtv', 'provision', [tokenVaultID, cellPhone, userId, password, email]);

module.exports = Mtv;