B3L7 has put together this Phaser 3 Project Template for you to use.
It combines Phaser 3 with Webpack, Tilemaps, and File Packs. This template was created to illustrate the conecept of having a single Level Class (Extended from the Scene Class) which generates the game level from dynamically loaded tilemaps.
There's a fantastic demo which you can play from the repo that shows-off a lot of what this pack has to offer. The demo is fun as a game in its own right, never mind getting the template needed to kick start your 2D overhead game creation :)