Generated TypeScript Types Issue: 'never' is Overridden by Other Types in Union Type

[0xtz]

Bug report

Description:

I'm encountering an issue with the generated TypeScript types when using Supabase. For the past 4 days, the types generated by the command supabase gen types typescript are producing TypeScript errors such as 'never' is overridden by other types in this union type. as indicated by SonarLint (typescript:S6571).

Supabase and Environment Details:

• Supabase CLI Version: ^1.204.3
• Project Setup: Using Next.js with standard TypeScript configuration
• TypeScript Configuration: Default configuration provided by Next.js
• Generation Command:

   supabase gen types typescript --project-id "XXXXXXXXXXXXXX" > src/lib/db_types.ts && prettier --write src/lib/db_types.ts

Error Details:

The error manifests in the generated file, specifically in union types where 'never' seems to be incorrectly set as the type.

Here’s a screenshot of the relevant section:

it's not an issue in 1 project No, its happening in 3 projects now, any idea ?

[0xtz]

If anyone is having this issue with Supabase's 'never' is overridden by other types in this union type., I found a temporary fix using ESLint overrides:

// Supabase `'never' is overridden by other types in this union type.` tmp fix
  overrides: [
    {
      files: ["src/lib/db_types.ts"], // Adjust this path to where your Supabase schema file is generated
      rules: {
        "@typescript-eslint/no-redundant-type-constituents": "off",
      },
    },
  ],

This solution disables the rule only for the generated file and prevents you from having to manually comment in the file every time it's regenerated. Hopefully, this can help while Supabase works on a permanent fix!

You can adjust the file path (src/lib/db_types.ts) as necessary before posting!