Bug report

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

Describe the bug

As of v2.65.0 and b957c30, the mfa.enroll function's return-type has changed, so that the following code in the official TOTP docs now throws a TypeScript error:

https://github.com/supabase/supabase/blob/7f0a216c40dafdd14ae99b7a6efe4801e8306144/apps/docs/content/guides/auth/auth-mfa/totp.mdx?plain=1#L122-L133

To Reproduce

Add the following test to this repo:

diff --git a/test/GoTrueClient.test.ts b/test/GoTrueClient.test.ts
index 6378ae1..7d42651 100644
--- a/test/GoTrueClient.test.ts
+++ b/test/GoTrueClient.test.ts
@@ -904,6 +904,20 @@ describe('User management', () => {
   })
 })

+describe('MFA', () => {
+  test('enroll({factorType: "totp"}) returns totp', async () => {
+    const { data, error } = await authWithSession.mfa.enroll({
+      factorType: 'totp',
+    })
+
+    if (error) {
+      throw error
+    }
+
+    expect(data.totp.qr_code).not.toBeNull()
+  })
+})
+
 describe('GoTrueClient with storageisServer = true', () => {
   const originalWarn = console.warn
   let warnings: any[][] = []

Running the tests will then cause the following TypeScript error in v2.65.0, but not before v2.65.0:

> @supabase/auth-js@0.0.0 test:suite
> jest --runInBand

 FAIL  test/GoTrueClient.test.ts
  ● Test suite failed to run

    test/GoTrueClient.test.ts:917:17 - error TS2339: Property 'totp' does not exist on type '{ id: string; type: "totp"; totp: { qr_code: string; secret: string; uri: string; }; friendly_name?: string | undefined; } | { id: string; type: "phone"; friendly_name?: string | undefined; phone: string; }'.
      Property 'totp' does not exist on type '{ id: string; type: "phone"; friendly_name?: string | undefined; phone: string; }'.

    917     expect(data.totp.qr_code).not.toBeNull()

Expected behavior

Either:

• Existing code should still function when updated to v2.65.0. E.g. the mfa.enroll function has types that say it never returns a type: "phone" when factorType: "totp" is passed. This could be done by using either

  • TypeScript's function overloads: https://www.typescriptlang.org/docs/handbook/2/functions.html#function-overloads
    • I've got a WIP PR that seems to work locally for this.
  • TypeScript's generic functions: https://www.typescriptlang.org/docs/handbook/2/functions.html#generic-functions

• If this is not possible, at least updating the docs in https://github.com/supabase/supabase/blob/7f0a216c40dafdd14ae99b7a6efe4801e8306144/apps/docs/content/guides/auth/auth-mfa/totp.mdx?plain=1#L122-L133

Screenshots

N/A

System information

• OS: Linux
• Version of supabase-js: v2.45.3 has this issue, v2.45.2 does not (probably due to supabase/supabase-js@ef76013
• Version of Node.js: v20.17.0
• Version of TypeScript: 5.5.4

Additional context

N/A