rollbar custom fingerprinting config to group all javascript errors by message

example.json

[
  {
    "condition": {"all": [
       {"path": "body", "contains": "message"},
       {"path": "language", "eq": "javascript"}
    ]},
    "fingerprint": "{{body.message.body}}"
  },
  {
    "condition": {"all": [
       {"path": "body", "contains": "trace"},
       {"path": "language", "eq": "javascript"}
    ]},
    "fingerprint": "{{body.trace.exception.class}}: {{body.trace.exception.message}}"
  }
]