how to query based on relation?

I have many to many relation between Project and User table. How to querry all projects that user is into?

 db.query.projects.findMany({
    where:  ---> users include userId ?
    with: {
      users: true,
    },
  });

 db.query.projects.findMany({
    where:  ---> users include userId ?
    with: {
      users: true,
    },
  });

 db.query.projects.findMany({
    where:  ---> users include userId ?
    with: {
      users: true,
    },
  });

 db.query.projects.findMany({
    where:  ---> users include userId ?
    with: {
      users: true,
    },
  });