Seems like there are some express externs in haxelib, but the github repo is dead and the lib probably not updated in a looong time.
I’m gonna have a stab at using GitHub - haxiomic/dts2hx: Converts TypeScript definition files (d.ts) to haxe externs (.hx) via the TypeScript compiler API to generate new express externs and then create a new lib. Or has anybody already done this?