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The first class IDE for F# is VS Code + Ionide. The language service backend for F# is also very well supported for emacs.

The first-class IDE for F# is the full Visual Studio, not VS Code + Ionide.

VS Code is now recommended by Microsoft for F# + .NET Core. Get with it, you're behind the times.

It's only recommended temporarily, until the issues get ironed out. It doesn't make it THE first-class F# IDE.