gulp-watch does not trigger while using a sync folder with vagrant

[pYr0x]

i am using vagrant and a sync folder to map my folder on windows.
simple example:

var gulp = require('gulp'),
    watch = require('gulp-watch'),
    gutil = require('gulp-util');


gulp.task('watch', function(){
    watch('*.js', function () {
        gutil.log("file changed");
    });
});

gulp.task('default', ['watch']);

but gulp is not trigger any file changes

[UltCombo]

That's actually a problem with the Virtualbox shared folders implementation, which does not emit file system events to the VM.

Try the usePolling: true option:

watch('*.js', { usePolling: true }, function () {

[pYr0x]

yeah, problem solved.
any restriction with usePolling?

[UltCombo]

Nope, but it may be more CPU-intensive. You can also set the interval option to define the file system polling interval in milliseconds if the default leads to too high CPU usage. See more info in the Chokidar docs.