How to access internal resources from background.js

Question

In a Google Chrome application is it possible to access bundled data files from within the background.js script?

E.g. if I had a file called data.

Answer 1

Since getPackageDirectoryEntry is not supported by firefox, it is not recommended. Now there is a simpler way.

async function loadData(resourcePath) {
    var url = chrome.extension.getURL(resourcePath);
    return (await fetch(url)).text();
}