Handling uncaught exceptions

So I am working on a project where there are many sagas and sometimes they result in errors. In development the errors get logged to the console (which is quite nice), but in production I’d like to be able to capture the exception and send it to an error monitoring service (such as honeybadger or getsentry), is there a way to do this?

The only thing I can think of is instead of passing many sagas to createSagaMiddleware to only pass a single root saga and to manually capture the error in the root saga after forking every other saga. Is there another approach that I could use?

[yelouafi]

@axelson For forked sagas you can use the done property to catch errors

function* wrap(saga, ...args) {
  const task = yield fork(saga, ...args)
  task.done.catch(reportTheError) // handle the error
  return task
} 

// wrap the fork effect
const wrapFork = (saga, ...args) => call(wrap, saga, ...args)

// then use it instead of fork
function* mySaga() {
  while(true) {
    const action = take(ACTION)
    yield wrapFork(doSomething, action)
  }
}

you can do the same thing with called sagas by putting the call in a try/catch then rethrow the error.

[tommedema]

@ronanwize re “we actually decided to push that down a layer so anything running in a saga will return an error object we can test for”: how did you create a lower level layer in which you can catch all sagas’ exceptions?