[Flutter] How to remove the hamburger button from a flutter drawer?

I've seem examples on how to set up a drawer in Flutter (return new Scaffold(drawer: new Drawer( ... ) or return new Scaffold(endDrawer: new Drawer( ... )).

How can I remove the hamburger button at the top (so that you can only get the drawer through sliding from the side (or through a custom button in the app - that I know how to do))?

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