/**

 * Created by udi on 2016/11/24.

 */

var gulp = require('gulp');

var babel = require('gulp-babel');

var es7SrcJs = ["es7/*/*.js"];

var descPath = "src";

gulp.task('babelify', function () {

    return gulp.src(es7SrcJs)

        .pipe(babel({

            presets: ['es2015', 'es2016', 'es2017'],

            plugins: [["transform-runtime", {

                "polyfill": false,

                "regenerator": true

            }]]

        }))

        .pipe(gulp.dest(descPath))

        .on('error', function (err) {

            console.log(err.stack);

            this.emit('end');

        })

});

gulp.task('watch', function(){

    return gulp.watch(es7SrcJs, ['babelify']);

});

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

var abc = o=>{ return 1;}

var sleep = function (time) {

    return new Promise(function (resolve, reject) {

        setTimeout(function () {

            resolve();

        }, time);

    })

};

var start = async function () {

    // 在这里使用起来就像同步代码那样直观

    console.log('start');

    await sleep(3000);

    console.log('end');

};

start();