Phaser Launcher is a brand new app and we are constantly improving it. We've got lots of plans for helpful features to add in. The app has an auto-update system built into it, so if you start it and get an 'update' prompt, please say "Yes" to let it auto update.
At the time of writing this Phaser Launcher only supports JavaScript. This means you cannot yet use TypeScript with it. This is on our roadmap, but isn't yet ready and we didn't want to hold off releasing.
We are also looking at the ability to create a 'bundle' directly from within Launcher, using an integrated build system, which would package all of your code and assets ready for publishing to a web site. Right now, the project files are self-contained, meaning you can deploy them directly to any website or hosting service such as GitHub Pages, but it will upload all of your source files directly and won't "compile" them together yet.
Because we don't use node internally this also means you cannot currently use any npm packages locally from Launcher. However, there are services such as unpkg that allow you to import modules from a URL instead, and this works perfectly in most cases.
This software is brand-new, so if you do find any bugs please join our Discord and let us know! Or if you don't like Discord you can email support@phaser.io instead. We cannot promise we'll reply to everything, but we'll do our best.