Generated type for `JSONB NOT NULL` column allows `null`

[nicksiscoe]

Bug report

• [x] I confirm this is a bug with Supabase, not with my own application.
• [x] I confirm I have searched the Docs, GitHub Discussions, and Discord.

Describe the bug

When I create a JSONB column that is explicitly NOT NULL, I can see that null values are not allowed according to Supabase Studio (it understands the Postgres restriction exists).

When I generate Typescript types for this database, however, the Json type for this column allows null.

To Reproduce

Steps to reproduce the behavior, please provide code snippets or a repository:

1. Create a non-nullable JSONB column
2. Run supabase gen types --lang=typescript
3. View the generated type for the column, which is Json

Expected behavior

I would expect the Typescript type for this column to be NonNullable<Json>.

Screenshots

(See above)

System information

• OS: macOS
• supabase: ^1.200.3
• Node: v20