Formatting on save breaks file watchers

[abbec]

The way that formatting on save is implemented makes file watching bundlers like Webpack and Parcel not work. It works the first time but does not send file system events for consecutive writes.

[richyliu]

This is fixed by PR #96, which was made in late 2016 and still hasn't been merged!

[greglearns]

+1 still a problem. Until (or if) this gets changed, editing the local bundled file to apply PR #96 works once you restart vim and parcel.