Hi Alon,
Thanks for the feedback.
I'm not sure legacy vm support is.
Looking at the code, it seems that XHR is used in the browser environment
(ENVIRONMENT_IS_WEB, ENVIRONMENT_IS_WORKER), so replacing XHR with Fetch is
possible and preferred. Feature detection could be used to detect Fetch an
Interesting, I didn't know Service Workers disallowed XHRs but allow fetch.
Then yes, we should use fetch where it is available.
The place to fix this is in src/shell.js, in readAsync. Apparently fetch is
in all modern browsers now, https://caniuse.com/#search=fetch so we can
probably just use fet
