几个Gulp任务等待另一个任务 [英] Several Gulp tasks wait for another one

问题描述

我需要建立的咕嘟咕嘟的任务，像这样的顺序：

任务1 - > Task2A，Task2B，Task2C - >任务3，

其中任务2A，2B，2C并行运行（但task1应该在之前完成，并且只完成一次）。

我尝试过：

  gulp.task（'Task1'，[]）; 
 
 gulp.task（'Task2A'，['Task1']）; 
 
 gulp.task（'Task2B'，['Task1']）; 
 
 gulp.task（'Task2C'，['Task1']）; 
 
 gulp.task（'Task3'，['Task2A'，'Task2B'，'Task2C']）; 
  

看起来像是在工作，但我不确定，它是否保证只会执行Task1 1次，或者它可以被触发多次？

谢谢。

解决方案

也许最简单的方法（不使用gulp4.0）是 run-序列插件。

您的情况：

  var runSequence = require（'run-sequence'）; 
 
 gulp.task（'build'，function（callback）{
 runSequence（'Task1'，
 ['Task2A'，'Task2B'，'Task2C']，
'Task3'，
回调）; 
}）; 
  

确保您的所有任务都有返回语句。

请注意

这是一个临时解决方案，直到发布gulp 4.0应该支持定义任务

考虑到Gulp 4似乎永远不会完全发布，请将其作为您的愿望。请注意，此解决方案是一种破解方式，可能会在将来更新gulp时停止工作。

I need to build a sequence of Gulp tasks like this:

Task1 -> Task2A, Task2B, Task2C -> Task3,

where tasks 2A,2B,2C run in parallel(but task1 should be completed before, and completed just once).

What I tried:

gulp.task('Task1', []);

gulp.task('Task2A', ['Task1']);

gulp.task('Task2B', ['Task1']);

gulp.task('Task2C', ['Task1']);

gulp.task('Task3', ['Task2A', 'Task2B', 'Task2C']);

Looks like it's working, but I'm not sure, does it guarantee that Task1 will be executed only 1 time, or it can be triggered multiple times?

Thank you.

解决方案

Perhaps the simplest way to do this (without using gulp4.0) is the run-sequence plugin.

For your case:

var runSequence = require('run-sequence');

gulp.task('build', function(callback) {
   runSequence( 'Task1',
               ['Task2A', 'Task2B', 'Task2C'],
                'Task3',
                callback);
});

Make sure you have return statements in all your tasks.

Please Note

This was intended to be a temporary solution until the release of gulp 4.0 which should have support for defining task dependencies similarly.

Given that Gulp 4 appears to never be fully released, take that for what you will. Be aware that this solution is a hack, and may stop working with a future update to gulp.

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