2.7 执行gulp的task任务，报Error: File not found

一、在执行gulp rename任务时报错

二、添加allowEmpty参数即可

gulp.task("rename",function (){
    var stream = gulp.src('./js/hello.txt',{allowEmpty: true})
        .pipe(rename('./js/goodbye.md'))
        .pipe(gulp.dest('./dist'))

    return stream
})