{
  // json5: comments + trailing commas + unquoted keys
  // __variants picks the first whose `when` matches the request
  __variants: [
    {
      when: { query: { role: 'admin' } },
      body: { role: 'admin', canDelete: true, seats: 999 },
    },
    {
      when: { headers: { 'x-tier': 'pro' } },
      body: { role: 'user', canDelete: false, seats: 25 },
    },
    {
      // fallback (no `when`)
      body: { role: 'user', canDelete: false, seats: 1 },
    },
  ],
}