Introduction to Run-sequence

Run-sequence is a powerful tool for orchestrating tasks in JavaScript projects. It allows you to manage the execution order of tasks, ensuring that dependencies are completed before their dependents. This tool is particularly useful for build processes, enabling efficient and error-free automation.

API Explanations with Code Snippets

Basic Usage

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

  runSequence('task1', 'task2', 'task3', function() {
    console.log('All tasks are done');
  });

In this example, tasks task1, task2, and task3 are executed in sequence. The callback function is executed after all the tasks are complete.

Using Task Arrays

  runSequence(['task1', 'task2'], ['task3', 'task4'], function() {
    console.log('All grouped tasks are done');
  });

You can group tasks using arrays. In this example, task1 and task2 will run in parallel, followed by task3 and task4.

Configuring Default Task

  gulp.task('default', function(callback) {
    runSequence('clean', ['build', 'styles'], 'watch', callback);
  });

In this example, the default task runs clean, followed by build and styles in parallel, and finally watch.

Handling Errors

  runSequence('task1', 'task2', 'task3', function(error) {
    if (error) {
      console.log('A task failed: ', error.message);
    } else {
      console.log('All tasks completed successfully');
    }
  });

Error handling is straightforward. The callback receives an error object if a task fails.

App Example Using Run-sequence APIs

Here’s an example of using run-sequence in a simple web application build process:

  const gulp = require('gulp');
  const runSequence = require('run-sequence');

  gulp.task('clean', function() {
    // Clean task implementation
  });

  gulp.task('html', function() {
    // HTML task implementation
  });

  gulp.task('css', function() {
    // CSS task implementation
  });

  gulp.task('js', function() {
    // JS task implementation
  });

  gulp.task('watch', function() {
    // Watch files for changes
  });

  gulp.task('build', function(callback) {
    runSequence('clean', ['html', 'css', 'js'], callback);
  });

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

In this workflow, the default task ensures that cleaning is done first, followed by parallel execution of html, css, and js tasks, and finishes by watching files for changes.

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