[4.0] gulp.watch fails working after a single update

[nmccready]

Gulp 4.0 was recently changed to use glob-watcher instead of chokidar directly. With that change watch does not work on sequential updates after the first change.

There are many comments on the change set here.

[phated]

Duplicate of #1623, #1624, #1626, #1638 and #1656 - Please look through issues before opening yet another issue about the exact same thing.

[alexisdiel]

added the done parameter at the last task and callback at the end.

gulp.task("reload", (done) => { browserSync.reload(); done(); });
gulp.task("js:watch", () => gulp.watch("lib/**/*.js", gulp.series("js", "reload")));