Retrieve an Active Transaction

In cases where you want to attach Spans to an already ongoing transaction, such as when grouping transactions, you can use Sentry.getCurrentHub().getScope().getTransaction(). This function will return a Transaction object when there is a running transaction on the scope, otherwise it returns undefined. If you are using our BrowserTracing integration, by default we attach the transaction to the Scope, so you could do something like this:

function myJsFunction() {
  const transaction = Sentry.getCurrentHub()
    .getScope()
    .getTransaction();
  if (transaction) {
    let span = transaction.startChild({
      op: "encode",
      description: "parseAvatarImages",
    });
    // Do something
    span.finish();
  }
}