files-exist-react-native.js

import RNFS from 'react-native-fs';

const filePath = RNFS.DocumentDirectoryPath + '/example.txt';

RNFS.exists(filePath)
  .then((exists) => {
    if (exists) {
      console.log('File exists');
    } else {
      console.log('File does not exist');
    }
  })
  .catch((error) => {
    console.log(error);
  });