pkgs.writers.writeFSharp

The following is the current implementation of this function.

nameOrPath:
    let
      fname = last (builtins.split "/" nameOrPath);
      path = if strings.hasSuffix ".fsx" nameOrPath then nameOrPath else "${nameOrPath}.fsx";
      _nugetDeps = mkNugetDeps {
        name = "${fname}-nuget-deps";
        nugetDeps = libraries;
      };

      nuget-source = mkNugetSource {
        name = "${fname}-nuget-source";
        description = "Nuget source with the dependencies for ${fname}";
        deps = [ _nugetDeps ];
      };

      fsi = writeBash "fsi" ''
        set -euo pipefail
        export HOME=$NIX_BUILD_TOP/.home
        export DOTNET_SKIP_FIRST_TIME_EXPERIENCE=1
        export DOTNET_CLI_TELEMETRY_OPTOUT=1
        export DOTNET_NOLOGO=1
        export DOTNET_SKIP_WORKLOAD_INTEGRITY_CHECK=1
        script="$1"; shift
        (
          ${lib.getExe dotnet-sdk} new nugetconfig
          ${lib.getExe dotnet-sdk} nuget disable source nuget
        ) > /dev/null
        ${lib.getExe dotnet-sdk} fsi --quiet --nologo --readline- ${fsi-flags} "$@" < "$script"
      '';

    in
    content:
    makeScriptWriter
      (
        (removeAttrs args [
          "dotnet-sdk"
          "fsi-flags"
          "libraries"
        ])
        // {
          interpreter = fsi;
        }
      )
      path
      ''
        #i "nuget: ${nuget-source}/lib"
        ${content}
        exit 0
      ''