OpenApiClientProvider can't be found

[exascape]

Just installed the SwaggerProvider and I keep getting an error
about the OpenApiClientProvider type not being found.

I have tried 4.1.0 and 4.0.0 to no avail; it seems like the type
has been elided from the package for reasons unknown. The package
does seem to be installed; importing it does not raise any errors,
and dotnet package list includes SwaggerProvider.

I installed and used the package with .NET version 10.0.400 in F#.

Example

open SwaggerProvider

let [<Literal>] Schema = "https://random-url.com/openapi.json"
type GotifyApi = OpenApiClientProvider<Schema>

Bit of a newbie to .NET so I assumed it was an issue on my side
until I discovered #248 -- it seems directly related to that.

Happy to help in any other way I can.

[exascape]

Oh, one more thing: the F# compiler got very, very
angry when I installed this package. I'll include
the errors below:

• '/Users/exascape/.nuget/packages/swaggerprovider/4.2.0/lib/net10.0/SwaggerProvider.Runtime.dll' reported an error: The type provider designer assembly 'SwaggerProvider.DesignTime.dll' could not be loaded from folder '/Users/exascape/.nuget/packages/swaggerprovider/4.2.0/typeproviders/fsharp41/net10.0'.

• The exception reported was: System.IO.FileNotFoundException - Could not load file or assembly 'FSharp.Core, Version=10.1.0.0, Culture=neutral, PublicKeyToken=xxx'. The system cannot find the file specified. F# Compiler[3049]

• Referenced assembly '/Users/exascape/.nuget/packages/swaggerprovider/4.2.0/lib/net10.0/SwaggerProvider.Runtime.dll' has assembly level attribute 'Microsoft.FSharp.Core.CompilerServices.TypeProviderAssemblyAttribute' but no public type provider classes were foundF# Compiler[3005]

Could it be that I'm using too new of a .NET version?
I assumed it would be OK as I thought 10 has been out
for quite a while; I'm unsure if the package doesn't
support it, however?

It was installed via dotnet package add too. I found
it strange that FSharp.Core was missing; I did install
it separately afterwards and it doesn't seem to have
removed the error.

[github-actions]

🤖 This is an automated response from Repo Assist.

Thanks for the detailed report, including the compiler error — that's very helpful.

The root cause is visible in your compiler error: Could not load file or assembly 'FSharp.Core, Version=10.1.0.0' ... The system cannot find the file specified.

The net10.0 design-time assembly (typeproviders/fsharp41/net10.0/SwaggerProvider.DesignTime.dll) is built with ExcludeAssets=runtime for FSharp.Core, meaning FSharp.Core.dll is intentionally not shipped alongside it — the type provider host (the F# compiler / IDE tooling) is expected to supply a compatible FSharp.Core at design time. When the host process can't resolve FSharp.Core, Version=10.1.0.0 (e.g. dotnet build/dotnet package add did not yet restore/copy a matching FSharp.Core.dll next to the compiler in your global tool/SDK context), the type provider designer assembly fails to load, and OpenApiClientProvider disappears entirely — exactly what you're seeing.

Suggested workaround to confirm this is the cause:

1. Run dotnet restore (not just dotnet package add) on your project so FSharp.Core 10.x is fully restored into your project's obj/package cache.
2. dotnet clean the project, delete bin/obj, then rebuild.
3. Make sure your SDK/CLI version and the FSharp.Core version referenced by your project are aligned (SDK 10.0.400 ships FSharp.Core 10.1.0.0, which matches the error — so this is likely a restore/resolution timing issue rather than a version mismatch).
4. If using an IDE (VS Code + Ionide, Rider, etc.), fully reload/restart the F# language service after restoring, since it caches assembly resolution.

If the workaround above doesn't resolve it, could you share the output of dotnet restore -v:detailed (or equivalent) for your project? That would help pin down whether FSharp.Core.dll is actually missing from your NuGet cache/output, or if this is a design-time assembly resolution probing-path issue specific to dotnet package add scaffolding. This looks related to but distinct from the now-closed #248 (which was about older .NET/design-time targeting), since 4.2.0 already ships net10.0 design-time binaries.

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