react-native-fs

Question

Hi, I'd like to write to a file in react native and am using an alternative to fs known as react-native-fs but get this error:

TypeError: Cannot read property 'RNFSFileTypeRegular' of null, js engine: hermes

The goal is to make a midi file; I am using midi-writer-js and have code that works except when it comes to fs (file system) https://github.com/grimmdude/MidiWriterJS

I also tried using nodeify to allow node modules (so regular fs) but this introduced bugs https://github.com/tradle/rn-nodeify.

If you could help it could be awesome!

Answer 1

Hi Caleb A.,

Would you please share the code that is driving the error "TypeError: Cannot read property 'RNFSFileTypeRegular' of null, js engine: hermes"?

Also, I did some reading on the TypeError (https://stackoverflow.com/questions/6550795/uncaught-typeerror-cannot-read-property-value-of-undefined) and react-native-fs (https://github.com/itinance/react-native-fs#readme) mentioned in the original post. I think some things we want to be clear on are:

1. What platform is being used (iOS, Android, Windows)?
2. What version of react is being used?
3. Is react-native-fs properly linked to your project (Automatically, Manually)?
4. Is there a variable definition of RNFSFileTypeRegular?
5. for example:
6. var RNFS = require('react-native-fs');

Matt