Abhijeet Rathore published this tutorial all about getting Phaser and Ionic 4 playing nicely together: "Ionic platform has become one of the big names in app development in recent years. Moving from Ionic 1 to 4 in past few years, Ionic has not just gained popularity, but also improved its robustness and reliability. Today, Ionic framework is one of the easiest to make an android or iOS app with, and also Progressive web apps.
Phaser, first released in 2013, has now become a huge name in 2D HTML5 games. Based on javascript, it can easily be integrated in a variety of javascript frameworks.
So why integrate Phaser and Ionic ?
While Ionic gives you the power of creating apps and PWA at a lightening speed, you cannot really make games with it. Phaser, while great at game building, is not really about building a structured mobile or web-app. Hence, building a neat looking game app or PWA with Phaser requires an HTML + CSS wrapper, a void which Ionic perfectly fills."