Cannot "disable" Datadog native modules in Expo Go

[holyris]

Hello, i'm using expo SDK 44 so I followed this documentation https://docs.datadoghq.com/fr/real_user_monitoring/reactnative/expo/ to disable datadog in dev mode.

The error i get:
Exception in HostObject::set for prop 'DdSdk'

Any clue ?

[louiszawadzki]

Hi @holyris,

Thank you for reporting this! It looks like this "hack" has not been tested enough, sorry for that.

Here's a version of the mockDatadog.ts file that I've tested more thoroughly, tell me if it works for you. If so I'll update our documentation shortly.

// mockDatadog.ts
import {
  DdLogs,
  DdTrace,
  DdRum,
  DdSdkReactNative,
} from "@datadog/mobile-react-native";

if (__DEV__) {
  const emptyAsyncFunction = () => new Promise<void>((resolve) => resolve());

  DdLogs.debug = emptyAsyncFunction;
  DdLogs.info = emptyAsyncFunction;
  DdLogs.warn = emptyAsyncFunction;
  DdLogs.error = emptyAsyncFunction;

  DdTrace.startSpan = () =>
    new Promise<string>((resolve) => resolve("fakeSpanId"));
  DdTrace.finishSpan = emptyAsyncFunction;
  DdRum.startView = emptyAsyncFunction;
  DdRum.stopView = emptyAsyncFunction;
  DdRum.startAction = emptyAsyncFunction;
  DdRum.stopAction = emptyAsyncFunction;
  DdRum.addAction = emptyAsyncFunction;
  DdRum.startResource = emptyAsyncFunction;
  DdRum.stopResource = emptyAsyncFunction;
  DdRum.addError = emptyAsyncFunction;
  DdRum.addTiming = emptyAsyncFunction;

  DdSdkReactNative.initialize = emptyAsyncFunction;
  DdSdkReactNative.setUser = emptyAsyncFunction;
  DdSdkReactNative.setAttributes = emptyAsyncFunction;
  DdSdkReactNative.setTrackingConsent = emptyAsyncFunction;
}

We also recommend switching to Expo development builds as they enable you to:

• check your integration with Datadog before shipping your app
• make update to Datadog's SDK more easily by testing it locally
• have insights on your debug application as well

If you decide to go this way instead, tell me if you encounter any issue :)

Sorry again for the inconvenience.

[louiszawadzki]

On a side note, please be aware that you might encounter issues when publishing your app with Expo 44.
We do not officially support this version of the SDK as it can require a few changes to deploy your app to the Google Play Store.

I would strongly recommend to update to Expo 45.
If that is not yet possible for you, there is a post on the Expo forum on how to prepare your app for a Google Play Store upload.
We haven't tested it so I cannot guarantee that it works nor that everything is needed. At least iff you're using the latest version of our SDK, you should not need the withKotlinFix.