Unit Testing: Blob is not defined

[smiles3983]

trying to unit test when I use the BlobReader. I know Blob is a Web-API, and nodejs doesnt have access to it. Ive been able to stub it within my JSX file, but when Zip.js runs, it doesnt appear to have access to my stub. Any ideas how to unit test this?

ReferenceError: Blob is not defined
at t (file:///c:/ws/Insight/wordaddin/node_modules/@zip.js/zip.js/lib/z-worker-inline.js:1:86)
at file:///c:/ws/Insight/wordaddin/node_modules/@zip.js/zip.js/lib/zip-fs.js:44:1
at ModuleJob.run (node:internal/modules/esm/module_job:185:25)
at async Promise.all (index 0)
at ESMLoader.import (node:internal/modules/esm/loader:281:24)
at importModuleDynamicallyWrapper (node:internal/vm/module:437:15)

[smiles3983]

this is the line im executing:
const reader = new zip.ZipReader(new zip.BlobReader(blob));

[gildas-lormeau]

Did you import zip.js asynchonously and inject Blob in globalThis? Here is an example showing how to use a Blob object in Node: https://github.com/gildas-lormeau/zip.js/tree/master/tests/node.

[bmaupin]

I had a similar issue where epubWriter.write() was giving me this error in my tests (testing with vitest): TypeError: blob.arrayBuffer is not a function

This fixed it!

import { Blob } from 'blob-polyfill';

globalThis.Blob = Blob;

[smiles3983]

I was able to make it work with blob-polyfill. And then I also had to use jsdom to replace FileReader from window.FileReader

[gildas-lormeau]

That's interesting, I was not expecting that you would need a FileReader implementation. What code is forcing you to polyfill it?

[gildas-lormeau]

I'm meaning that if FileReader is not needed by zip.js (this is what I expect) but by your code, then you could maybe use Blob#text or Blob#arrayBuffer instead.

[gildas-lormeau]

Note that you don't need to import zip.js asynchronously in Node.js with the version 2.4.5.

[gildas-lormeau]

I'm moving this issue to the Discussion tab