GulpUglifyError: unable to minify JavaScript
Caused by: SyntaxError: Invalid assignment
File: app/assets/js/main.js
Line: 92
invalid assignment [] =

[newTitle, newVal] = $('#' + elementId + '-title').text().replace('*', '').split(':');

[prodW = 0, prodL = 0, boxL = 0] = currentOption.text().split(/[/-]/);

gulp.task('compressJS', function (cb) {
    pump([
            gulp.src('app/assets/js/*.js'),
            uglify(),
            gulp.dest('build/js/')
        ],
        cb
    );
});