Updating to 4.0 BETA, and confused about where to set the CredentialsConfig

[Rhym]

Good morning! I am updating my next auth in preparation for the 4.0 release and my previously working Credentials provider has an issue with the the authorize callback. I receive a "Types of parameters 'credentials' and 'credentials' are incompatible. Type 'Record<never, string>' is missing the following properties from type '{ username: string; password: string; }': username, password". "The expected type comes from property 'authorize' which is declared here on type 'Partial<CredentialsConfig<{}>>'"

I see that the CredentialsConfig takes a generic, but I'm not actually sure where to set the config. Any help would be appreciated, thank you. Example of my code:

providers: [
  // https://next-auth.js.org/configuration/providers
  CredentialsProvider({
    id: "login",
    name: "Login",
    credentials: {
      username: {},
      password: {},
    },

    authorize: async (credentials: { username: string; password: string }) => {
      const DATA = { username: credentials.username, password: credentials.password };
      // Login logic...
    },
  }),
],

[Rhym]

Discussed in #2677