nullable boolean resolver cannot return null

[villesau]

Hi,

I have following resolver:

    t.nullable.boolean('voted', {
      async resolve(root, _, ctx) {
        if (!ctx.user) {
          return null;
        }
        return voted( ctx.user?.id);
      }
    });

However, I'm not able to get rid of the following error:

TS2322: Type '(root: { root: string }, _: {}, ctx: any) => Promise<...>' is not assignable to type 'FieldResolver<"Thing", "voted">'.   Type 'Promise<boolean | null>' is not assignable to type 'MaybePromise<boolean>'.     Type 'Promise<boolean | null>' is not assignable to type 'PromiseLike<boolean>'.       Types of property 'then' are incompatible.         Type '<TResult1 = boolean | null, TResult2 = never>(onfulfilled?: ((value: boolean | null) => TResult1 | PromiseLike<TResult1>) | null | undefined, onrejected?: ((reason: any) => TResult2 | PromiseLike<...>) | null | undefined) => Promise<...>' is not assignable to type '<TResult1 = boolean, TResult2 = never>(onfulfilled?: ((value: boolean) => TResult1 | PromiseLike<TResult1>) | null | undefined, onrejected?: ((reason: any) => TResult2 | PromiseLike<...>) | null | undefined) => PromiseLike<...>'.           Types of parameters 'onfulfilled' and 'onfulfilled' are incompatible.             Types of parameters 'value' and 'value' are incompatible.               Type 'boolean | null' is not assignable to type 'boolean'.                 Type 'null' is not assignable to type 'boolean'.  definitionBlocks.d.ts(160, 5): The expected type comes from property 'resolve' which is declared here on type 'OutputScalarConfig<"Thing", "voted"> & { resolve: FieldResolver<"Thing", "voted">; }

reduced version of the above:

 Type 'boolean | null' is not assignable to type 'boolean'.                 Type 'null' is not assignable to type 'boolean'.  definitionBlocks.d.ts(160, 5): The expected type comes from property 'resolve' which is declared here on type 'OutputScalarConfig<"Thing", "voted"> & { resolve: FieldResolver<"Thing", "voted">; }

Happens also after deleting schema & generated types & starting from scratch. Note that I'm using

  nonNullDefaults: {
    input: true,
    output: true
  },

options in my makeSchema.