Just Seeking Clarification on Movement of Directories

[hebozhe]

I've got the following file architecture for my React Native project:

.
+-- __tests__
[*snip*]
+-- screens
|   +-- Settings.js
+-- userdata
|   +-- userdata.json
[*snip*]
App.js

And I'd like to read and overwrite userdata.json. However, I can't identify the path where to find the document at build. Here's the relevant snippet from Settings.js:

import { DocumentDirectoryPath, exists, readFile, writeFile } from 'react-native-fs';

var userSettings = readFile(DocumentDirectoryPath + 'userdata/userdata.json', 'utf8')
    .then((success) => {console.log(success);})
    .catch((error) => {console.log(error.message);});

I've tried various approaches on the path parameter, but none of them find the JSON file in the build. So, generally speaking, relative to whatever <Named>DirectoryPath, where do the files in the above-organized architecture end up?