PDF Share crashes the app on Android

Steps to reproduce

1. Follow the steps from https://github.com/react-native-community/react-native-share#share-remote-pdf-file-with-gmail--whatsapp-ios using sharePDFWithAndroid
2. Execute

This is my own code which is similar:

const share = () => {
    const uri = 'https://www.apple.com/support/products/pdf/applecare_ipod_t_and_c_11182003.pdf';
    const type = 'application/pdf';

    RNFetchBlob.config({
      fileCache: true,
    })
      .fetch('GET', uri)
      .then(resp => {
        return resp.readFile('base64');
      })
      .then(async base64Data => {
        const url = `data:${type};base64,` + base64Data;
        await Share.open({ url });
      });
  };

Expected behaviour

The Share panel opens

Actual behaviour

The application crashes with the following error:

Works fine on iOS.

Environment

• React Native version: 0.58
• React Native platform + platform version: Android 9

react-native-share

Version: 1.1.3

[mikehardy]

Predictably, me not following the docs was the root cause (https://github.com/react-native-community/react-native-share/pull/197) - users are terrible aren’t they? Never following the docs 😉

[mikehardy]

Last followup in case someone lands here from google searching for the error message. If you see 'undefined is not a function (evaluating 'Object.keys(styles)[typeof Symbol === "function" ? Symbol.iterator: "@@iterator']()]') as an error message, it is an as-yet-unreported bug in react-native/Libraries/Promise.js where the ‘pretty-print’ library is messing up error message display.

If you replace the line in Promise.js that requires pretty-print with a straight print of error.message you will see the unmasked message is that there is a possible unhandled Promise rejection.

And if you think through that, you will realize that you probably have an async function in your code, with a try/catch block that looks right, but in your try block you forgot to actually await on whatever API you called that returns a Promise. You just called the API directly with no await keyword. So the Promise rejection is not handled and you need to study Javascript async/await more to improve your skills. And you also need to fix whatever is causing the rejection but that’s also a problem in your code. Good luck 😃