How to Automate Tasks in Visual Studio Code

var gulp = require('gulp');
var uglify = require('gulp-uglify');
var sass = require('gulp-sass');

var jsSrc = './js/src/**/*.js';
var sassSrc = './css/sass/**/*.scss';

gulp.task( 'scripts', function() {
  return  gulp.src( jsSrc )
                .pipe( uglify() )
                .pipe( gulp.dest( './js' ) )
});

gulp.task( 'styles', function() {
  return  gulp.src( sassSrc )
                .pipe( sass( { outputStyle: 'compressed' } ) )
                .pipe( gulp.dest( './css' ) );
});

gulp.task( 'automate', function() {
  gulp.watch( [ sassSrc, jsSrc ], [ 'scripts', 'styles' ] );
});

gulp.task( 'default', ['scripts', 'styles', 'automate'] );