Using unique compound indizes with Dexie.js

dexie-unique-compound-indizes.js

const db = new Dexie('friends')
db.version(1).stores({
  friends: '++id,&[name+age]',
})

async function main() {
  await db.friends.add({ name: 'Robin', age: 1337 })
  // this will fail with:
  // ConstraintError: A mutation operation in the transaction failed because a constraint was not satisfied.
  await db.friends.add({ name: 'Robin', age: 1337 })

  // query like this:
  const allMyFriendsAreDead = await db.friends.where({
    name: 'Robin',
    age: 1337,
  })
  console.log(allMyFriendsAreDead)
}

main()