How do I get types for relationship queries?

// Users table
export const users = pgTable('users', {
  id: serial('id').primaryKey(),
  email: varchar('email', { length: 255 }).notNull().unique(),
  name: text('name').notNull(),
  createdAt: timestamp('created_at').defaultNow().notNull()
});

// Todos table
export const todos = pgTable('todos', {
  id: serial('id').primaryKey(),
  title: varchar('title', { length: 255 }).notNull(),
  completed: boolean('completed').default(false).notNull(),
  userId: integer('user_id').references(() => users.id).notNull(),
  createdAt: timestamp('created_at').defaultNow().notNull()
});

// Define the relationships
export const usersRelations = relations(users, ({ many }) => ({
  todos: many(todos)
}));

export const todosRelations = relations(todos, ({ one }) => ({
  user: one(users, {
    fields: [todos.userId],
    references: [users.id],
  })
}));

// Example usage:
const db = drizzle(client);

// Query user with their todos
const userWithTodos = await db.query.users.findFirst({
  where: (users, { eq }) => eq(users.id, newUser[0].id),
  with: { // HOW DO I GET THESE TYPES?
    todos: true
  }
});


I want to do something like this, but I want to be able to pass a type for my relationships so I know what can be passed in.
getUserById = (id, relationships?) => {
  await db.query.users.findFirst({
  where: (users, { eq }) => eq(users.id, newUser[0].id),
  ...(relationships ? { with: relationships } : {})
});
}