Just like gulp dest but supports multiple output paths Intended to work with Gulp 5

npm install gulp-multi-dest --save-dev

var gulp = require('gulp');
var multiDest = require('gulp-multi-dest');

var destOptions = {
    mode: 0755
};

gulp.task('copy', function() {
  return gulp.src('./js/*.js')
    .pipe(multiDest(['./dist1/js', './dist2/js'], destOptions));
});

To start the tests run npm install and then npm run test.