FS0039 Configure is not defined

[jtourlamain]

I tried to create a new Giraffe project via the manual steps.

To reproduce:

• Create a new dotnet core console app in visual studio (dotnet core 3.1)
• Add Giraffe NuGet (4.1.0)
• Update Program.fs with:

module Firaffe
open System
open Microsoft.AspNetCore.Builder
open Microsoft.Extensions.Hosting
open Microsoft.Extensions.DependencyInjection
open Giraffe

let webApp =
    choose [
        route "/ping"   >=> text "pong"
        route "/"       >=> htmlFile "/pages/index.html" ]

let configureApp (app : IApplicationBuilder) =
    // Add Giraffe to the ASP.NET Core pipeline
    app.UseGiraffe webApp

let configureServices (services : IServiceCollection) =
    // Add Giraffe dependencies
    services.AddGiraffe() |> ignore

[<EntryPoint>]
let main _ =
    Host.CreateDefaultBuilder()
        .ConfigureWebHostDefaults(
            fun webHostBuilder ->
                webHostBuilder
                    .Configure(configureApp)
                    .ConfigureServices(configureServices)
                    |> ignore)
        .Build()
        .Run()  
    0 // return an integer exit code

Trying to compile the code gives the "FS0039" error on line with .Configure(configureApp)
What did I miss to get this error?

[tangledupinblue]

I had the same issue, it just turned out to be a missing dependency.

Dependencies should be:

open System
open Microsoft.AspNetCore.Builder
open Microsoft.AspNetCore.Hosting
open Microsoft.Extensions.Hosting
open Microsoft.Extensions.DependencyInjection
open Giraffe

This is for the second, functional startup example on README.

For the first example there are also missing dependencies (for logging and core hosting). These should be:

open System
open Microsoft.AspNetCore.Builder
open Microsoft.AspNetCore.Hosting
open Microsoft.Extensions.Hosting
open Microsoft.Extensions.Logging
open Microsoft.Extensions.DependencyInjection
open Giraffe

[jtourlamain]

@tangledupinblue thank you so much. That did the trick! Weird that Visual Studio doesn't offer to add the missing dependency.