tus-js-client failing to run in Cloudflare Workers

[Schachte]

Describe the bug I'm attempting to leverage tus for large file uploads using Cloudflare Workers. Simply running const tus = require("tus-js-client") yields window is not defined.

I've tried various hacks like defining window in global scope to an empty object, trying conditional importing, but I can't seem to get around this. Any suggestions?

import * as tus from "tus-js-client"; 
const tus = require("tus-js-client"); 

These yield the same result

[Acconut]

I have never used Cloudflare Workers, so my knowledge is limited. However, it seems that they implement a limited set of browser-like APIs (such as WebSocket, Web Crypto, Fetch etc) but not a full browser environment. Hence window is not defined.

So it seems as if tus-js-client is currently not compatible with Cloudflare Workers, but I think it would be possible to achieve support for that. Two things need to be changed at least:

• tus-js-client accesses the window object from time to time for feature detection. It assumes that window exists but with additional checks where window is actually defined, tus-js-client should also run without window being available. Btw, what is the stack trace of your exception?
• tus-js-client uses the XMLHttpRequest API for making requests. Cloudflare Workers does not support it but only the newer Fetch API: https://community.cloudflare.com/t/xmlhttprequest-is-not-defined/133866 It is possible to implement a HTTP Stack for tus-js-client based on the Fetch API, so that tus-js-client can also make HTTP requests inside Cloudflare Workers. See https://github.com/tus/tus-js-client/blob/master/docs/api.md#httpstack

All in all, tus-js-client could run on Workers. Let me know if you are interested in helping with the above points. I don't have enough time to work on them on my own, but I am more than willing to assist you.

[Schachte]

Hey @Acconut , apologies for the late response. Thanks for the detailed reply! Once I get a bit of time, I can circle back to this and try and throw up a PR. 

[Acconut]

@Schachte Great to hear back from you! Let me know if you need further assistance!