Using the Loops provider generates TS errors

Provider type

Loops

Environment

  System:
    OS: macOS 15.3.2
    CPU: (10) arm64 Apple M1 Max
    Memory: 1.81 GB / 64.00 GB
    Shell: 5.9 - /bin/zsh
  Binaries:
    Node: 22.14.0 - ~/.nvm/versions/node/v22.14.0/bin/node
    Yarn: 1.22.22 - ~/.nvm/versions/node/v22.14.0/bin/yarn
    npm: 10.9.2 - ~/.nvm/versions/node/v22.14.0/bin/npm
    pnpm: 10.6.3 - ~/Library/pnpm/pnpm
  Browsers:
    Chrome: 135.0.7049.97
    Edge: 126.0.2592.87
    Safari: 18.3.1
  npmPackages:
    @auth/unstorage-adapter: ^2.0.0 => 2.9.0
    next: latest => 15.3.1
    next-auth: beta => 5.0.0-beta.26
    react: ^18.2.0 => 18.3.1

Reproduction URL

https://github.com/gfpacheco/next-auth-loops-bug

Describe the issue

Using the Loops provider generates TypeScript errors:

Type 'LoopsConfig' is not assignable to type 'Provider'.
  Type 'LoopsConfig' is not assignable to type 'EmailConfig & InternalProviderOptions'.
    Type 'LoopsConfig' is not assignable to type 'EmailConfig'.
      Types of property 'sendVerificationRequest' are incompatible.
        Type '(params: Params) => Promise<void>' is not assignable to type '(params: EmailProviderSendVerificationRequestParams) => Awaitable<void>'.
          Types of parameters 'params' and 'params' are incompatible.
            Type 'EmailProviderSendVerificationRequestParams' is not assignable to type 'Params'.
              Type 'EmailProviderSendVerificationRequestParams' is not assignable to type '{ provider: LoopsConfig; }'.
                Types of property 'provider' are incompatible.
                  Property 'transactionalId' is missing in type 'EmailConfig' but required in type 'LoopsConfig'.

How to reproduce

Just try to use the Loops provider, TypeScript will say the types are wrong.

Expected behavior

Using the Loops provider shouldn't trigger any TS errors.

Start with the Loops provider entry point in the next-auth source and compare its sendVerificationRequest parameter type with the provider type shown in the error. Use the reproduction repository to run TypeScript checking; done means the Loops provider can be configured without the reported type error.