Subsequent migrations fail with type 'JsonDocument' is not defined error for JSONB column

[nodakai]

Describe the bug

To Reproduce

type Tab = {
  Id: int
  Js: JsonDocument
}

ef migrations add First
ef database update  # works
ef migrations add Second

migrations/20231103200659_Second.fs(502,24): error FS0039: The type 'JsonDocument' is not defined.

which is from this line

            b.Property<JsonDocument>("Js")
                .IsRequired(true)
                .HasColumnType("jsonb")
                |> ignore

without open System.Text.Json

(Additionally, to avoid potential conflicts with user-defined types, wouldn't it be safer for machine-generated files to always use fully qualified type names, prefixed with global, given that one might create an entity named Int?)

Additional context

% dotnet list package
Project 'My.Postgres.Lib' has the following package references
   [net7.0]: 
   Top-level Package                               Requested   Resolved
   > EntityFrameworkCore.FSharp                    6.0.7       6.0.7   
   > FSharp.Core                                   7.0.400     7.0.400 
   > FSharpPlus                                    1.5.0       1.5.0   
   > Microsoft.EntityFrameworkCore.Design          6.0.23      6.0.23  
   > Microsoft.EntityFrameworkCore.Relational      6.0.23      6.0.23  
   > Npgsql.EntityFrameworkCore.PostgreSQL         6.0.22      6.0.22  

Logs above have been extracted from our proprietary codebase and edited to omit certain confidential details, are not from a minimal, self-contained repro

[nodakai]

Just noticed I can add Workaround.fs before migration codes:

namespace Microsoft.EntityFrameworkCore

type JsonDocument = System.Text.Json.JsonDocument

"Poor man's global using", so to speak.

But I'm facing another problem now (was it there from the beginning?) The bug I reported above was about timestamped migrations codes but this time it's *Snapshot.fs that is malformed, it starts with

open System
open System.Text.Json
open 

Yes, an empty open statement. No way to circumvent this syntax error with namespace and alias tricks.

[simon-reynolds]

Hi, I'll take a look at this when I can but this is a bit of a one man show at the moment and I have limited time

Snapshot being generated with an empty open statement is new, I haven't encountered that issue before.

What version of EF Core are you working with?

[nodakai]

Thank you very much @simon-reynolds

I've opened a new issue, as the empty open issue appears to be distinct from the absence of open System.Text.Json