问题描述

以下是我的 gulpfile.js.里面还有几个任务，一切都运行良好 - 但最后一个任务，watch 没有.

Following is my gulpfile.js. There are a couple of more tasks in it and all are working fine - but the last task, watch doesn't.

我已经尝试了所有可能的路径和文件组合，但我仍然没有运气.我在这里阅读了很多关于此的答案，但无法解决我的问题.我尝试在需要和不需要 gulp-watch 的情况下运行 gulp.watch，尝试了几种不同的方法来设置任务等等......

I've tried every possible combination of paths and files and what so ever, but still I don't have luck. I've read many answers on this here, but couldn't solve my problem. I tried to run gulp.watch with and without requiring gulp-watch, tried several different approaches on how to set up the task and so on and so on...

var gulp = require('gulp');
var browserify = require('browserify');
var babelify = require('babelify');
var source = require('vinyl-source-stream');
var watch = require('gulp-watch');

gulp.task('application', function() {
    return browserify('./public/resources/jsx/application.js')
        .transform(babelify, { stage: 0 })
        .bundle()
        .on('error', function(e){
            console.log(e.message);

            this.emit('end');
        })
        .pipe(source('appBundle.js'))
        .pipe(gulp.dest('./public/resources/jsx'));
});

gulp.task('watch', function() {
    gulp.watch('./public/resources/jsx/project/*.js',['application'])
});

有人可以提出解决方案吗?

Can someone suggest a solution?

这是控制台输出:

michael@michael-desktop:/opt/PhpstormProjects/app_april_2015$ gulp watch
[23:05:03] Using gulpfile /opt/PhpstormProjects/app_april_2015/gulpfile.js
[23:05:03] Starting 'watch'...
[23:05:03] Finished 'watch' after 13 ms

推荐答案

你应该return观看:

gulp.task('watch', function() {
    return gulp.watch('./public/resources/jsx/project/*.js',['application'])
});

watch 是一个 async 方法，所以 Gulp 知道某事正在发生的唯一方法是如果你返回一个 promise，它会监视可以.

watch is an async method, so the only way Gulp can know that something is happening is if you return a promise, which watch does.

编辑

正如@JMM 所说，watch 不会返回 Promise.它返回一个 EventEmitter.

As @JMM stated, watch doesn't return a Promise. It returns an EventEmitter.

这篇关于gulp watch 不看的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持编程学习网！