Please associate the extension `.mjs` with javascript. When I open a mjs file, that contains javascript, the syntax highlighting I expect doesn't occur.
Furthermore, I see no way, within Geany's settings to create this association for future times that I open a `.mjs` file.
Lastly, at the bottom of the screen, where is says "Filetype: None", clicking that doesn't allow you to manually set the file type. I find this fact very unintuitive.