TypeScript Error with Schema Fields in TaggedRequest

export const LoginArgs = Schema.struct({
  username: EmailAddress,
  password: Schema.NonEmpty,
});

export class LoginRequest extends Schema.TaggedRequest<LoginRequest>()(
  "LoginRequest",
  AuthServiceError,
  Session,
  LoginArgs
) {}

Argument of type 'struct<{ username: Schema<string, string, never>; password: $string; }>' is not assignable to parameter of type 'Fields'.
  Index signature for type 'string' is missing in type 'struct<{ username: Schema<string, string, never>; password: $string; }>'

export class LoginArgs extends Schema.Class<LoginArgs>("LoginArgs")({
  username: EmailAddress,
  password: Schema.NonEmpty,
}) {
  static decode = Schema.decodeUnknown(LoginArgs);
}

export class LoginRequest extends Schema.TaggedRequest<LoginRequest>()(
  "LoginRequest",
  AuthServiceError,
  Session,
  LoginArgs
) {}

Argument of type 'typeof LoginArgs' is not assignable to parameter of type 'Fields'.
  Index signature for type 'string' is missing in type 'typeof LoginArgs'.