javascript – 为什么Gulp在运行依赖它的任务之前没有完成我的’干净’任务？

我有一个gulpfile,应该在缩小代码之前清理我的dist目录.有时,干净的任务仍在运行,同时代码被缩小,导致一些丢失的文件.

是什么导致它这样做？我的理解是,任务的依赖关系将在任务运行之前完成,并且依赖关系只会运行一次,即使它是多个任务的依赖关系.

var gulp = require('gulp');
var gulpLoadplugins = require('gulp-load-plugins');
var plugins = gulpLoadplugins();
var del = require('del');

gulp.task('default',['css','js','fonts']);

gulp.task('clean',function(cb) {
  del(['dist/**'],cb);
});

gulp.task('css',['clean'],function() {
  return gulp.src('style.css')
            .pipe(plugins.autoprefixer({
              browsers: ['last 2 versions']
            }))
            .pipe(gulp.dest('dist'))
            .pipe(plugins.minifyCss({
              norebase: true,keepSpecialComments: 0
            }))
            .pipe(plugins.rename({extname: '.min.css'}))
            .pipe(gulp.dest('dist'));
});

gulp.task('js',function() {
  return gulp.src('scripts.js')
            .pipe(gulp.dest('dist'))
            .pipe(plugins.uglify({preserveComments: 'some'}))
            .pipe(plugins.rename({extname: '.min.js'}))
            .pipe(gulp.dest('dist'));
});

gulp.task('fonts',function() {
  return gulp.src('fonts/*')
            .pipe(gulp.dest('dist/fonts'));
});

更新：Gulp输出表明clean任务在其他任务启动之前完成,但有时并非所有输出文件都在dist目录中.有时他们是.

[09:47:15] Using gulpfile /Users/raddevon/Documents/projects/AlphaBlog/theme/gulpfile.js
[09:47:15] Starting 'clean'...
[09:47:15] Finished 'clean' after 8.06 ms
[09:47:15] Starting 'css'...
[09:47:15] Starting 'js'...
[09:47:16] Starting 'fonts'...
[09:47:16] Finished 'js' after 399 ms
[09:47:16] Finished 'css' after 899 ms
[09:47:16] Finished 'fonts' after 267 ms
[09:47:16] Starting 'default'...
[09:47:16] Finished 'default' after 7.78 μs

解决方法

使用del.sync(),其他任务将仅在清理任务完成后启动.

gulp.task('clean',function () {
    del.sync(['./build/**']);
});

还检查这个帖子：
How to clean a project correctly with gulp?

原文地址：https://www.jb51.cc/js/158760.html