Not including SockJS in the modern JS bundle was a nice bundle size
savings (28KB before gzip), but SockJS works better than a native
WebSocket for clients that are stuck in unusual networking situations, and
the fallback of using dynamic import() to load SockJS when the native
WebSocket failed was much slower than simply including SockJS in the
bundle and using it from the start.
Moreover, the new `meteor create --minimal` starter app does not use
socket-stream-client (nor DDP), so going back to including SockJS in both
the modern and the legacy bundles should have no impact on the minimal
modern bundle size.
If you want to continue using a native WebSocket instead of SockJS, you
can always pin the older version of the socket-stream-client package:
meteor add socket-stream-client@0.2.1
Thanks to bug reports from @jamesmillerburgess, in Meteor 1.6.1-rc.4 we
reverted a change that unsuccessfully attempted to remove SockJS from the
JS bundle (and instead injected a <script> tag to load SockJS in older
browsers): 365804218f
With this commit, we are once again attempting to exclude SockJS from the
JS bundle for modern browsers, this time taking advantage of the
web.browser.legacy system to control which browsers receive which bundle.
The definition of a "modern" browser is stricter now (essentially, any
browser with native async/await support), so I'm hopeful that browsers
with incomplete WebSocket support will get the legacy bundle, which
includes SockJS.
However, if there are still bugs in modern browsers due to faulty
WebSocket message compression (for example), we should be able to address
those problems directly, rather than reverting this change yet again.
I missed these packages when publishing 1.6.2-beta.0, since I hadn't
bumped their versions in #9439 as I should have, so the release script did
not republish them. Because of this, 1.6.2-beta.0 will not be usable, and
so I will publish 1.6.2-beta.1 ASAP.
The boilerplate-generator version bump is patch rather than minor, since
the relevant changes to that package seemed backwards-compatible.
