mutation DeleteReaction($input: DeleteReactionInput!) {
  deleteReaction(input: $input) {
    clientMutationId
    deletedId
    errors
  }
}

{
  "input": {
    "emoji": "string",
    "targetId": "id"
  }
}

{
  "data": {
    "deleteReaction": {
      "clientMutationId": "string",
      "deletedId": "id",
      "errors": [
        "string"
      ]
    }
  }
}