How to use beforeRecordMutate with mongoose resolverds?

Hello everybody, I'm creating resolvers for my User schema like this:
`schemaComposer.Mutation.addFields({
userCreateOne: UserTC.mongooseResolvers.createOne(),
userCreateMany: UserTC.mongooseResolvers.createMany(),
userUpdateById: UserTC.mongooseResolvers.updateById(),
userUpdateOne: UserTC.mongooseResolvers.updateOne(),
userUpdateMany: UserTC.mongooseResolvers.updateMany(),
userRemoveById: UserTC.mongooseResolvers.removeById(),
userRemoveOne: UserTC.mongooseResolvers.removeOne(),
userRemoveMany: UserTC.mongooseResolvers.removeMany()
});`

I would like to modify the document before save but can't figure out how to use `beforeRecordMutate`.
I tried wrapping the resolver but I get an error that a resolver with that name doesn't exist... I assume it's because I'm using mongoose resolvers.