On-jsload is required because recompiled files are not being reloaded

[Deraen]

With :recompile-dependents option Cljs will recompile all files which depend on a changed namespace. This has a side-effect that when a file is changed, all files which depend on that file are rewritten by Cljs compiler. If all changed files were reloaded, the main namespace would be reloaded and probably it would automatically cause the application to be "restarted".

Boot-reload currently only reloads files which contents have changed: https://github.com/adzerk-oss/boot-reload/blob/master/src/adzerk/boot_reload.clj#L20

After removing the :hash option files will be reloaded also when only the modification time has changed. Unfortunately this will cause boot-reload to also try to reload files which shouldn't be reloade, e.g. the Cljs shim.