How to Migrate to Gulp.js 4.0

Gulp.js 4.0 Migration Guide: Simplify your build process

Gulp.js 4.0 is now the default version, replacing Gulp.js 3.x. While migration is not mandatory, the new version brings many improvements, and most configurations can be migrated in just a few hours.

Main changes:

• Default version upgrade: Gulp.js 4.0 becomes the default version, and you can install it using npm install gulp.
• Task combination: series() and parallel() methods replace the 3.x version of task arrays, which are used to execute tasks in serial and parallel respectively, thereby more granularly controlling the order of task execution.
• Async task processing: Asynchronous functions in Gulp.js 4.0 need to explicitly inform the completion status. This can be done by returning a Promise, implicitly returning, or passing a callback function.
• ES6 module support: Support for ES6 module export mode, bringing many advantages, such as defining private tasks, passing functions by reference, the same function can be used for multiple task names, and easier definition of and/or series(). parallel()

Why migrate?

While the competition among tools such as Webpack and Parcel, Gulp.js is still one of the most popular JavaScript task runners. Gulp.js is configured using code to make it a versatile and versatile option. In addition to common translations, packaging, and real-time reloading, Gulp.js can analyze databases, render static sites, push Git submissions, and publish Slack messages with a single command.

Migration steps:

1. Update :package.json Update the version in package.json to gulp and run ^4.0.0. You can also use npm install to update the command line interface, but this has not changed at the time of writing. npm i gulp-cli -g

2. Verify installation: Enter in the command line to verify installation: gulp -v

<code>$ gulp -v
[15:15:04] CLI version 2.0.1
[15:15:04] Local version 4.0.0</code>

3. Migration :gulpfile.js Errors may be encountered during the migration process, such as . This is usually because the way the task is defined requires adjustment. AssertionError [ERR_ASSERTION]: Task function must be specified

4. Convert task array to Call:series() Gulp.js 3 allows specifying arrays of synchronized tasks. In Gulp.js 4, use the method instead: series()

<code>$ gulp -v
[15:15:04] CLI version 2.0.1
[15:15:04] Local version 4.0.0</code>

5. Handling asynchronous task completion: Gulp.js 4 You need to know when the asynchronous task is completed. You can use return Promise, implicit return or callback functions:

<code class="language-javascript">// Gulp.js 3
gulp.task('css', ['images'], () => { ... });

// Gulp.js 4
gulp.task('css', gulp.series('images', () => { ... }));</code>

6. Export mode with ES6 modules (recommended): This is a more flexible and easier to maintain way to define tasks.

FAQs:

• What are the main differences between Gulp 4 and Gulp 3? Gulp 4 introduces a new task execution system, which defaults to serial execution, and uses the gulp.series() and gulp.parallel() methods to control the task execution order.

• How to update my Gulp 3 code to Gulp 4? It mainly requires replacing the old task dependency syntax with the new gulp.series() and gulp.parallel() methods and updating the package.json files.

• What are the functions of

  gulp.series() and gulp.parallel()? is used to perform tasks in serial and parallel respectively.

• How to use the new gulp.watch() method? is similar to Gulp 3, but needs to be used in combination with gulp.series() or gulp.parallel().

• When I update to Gulp 4, why does my Gulp task report an error? Probably because the code still uses Gulp 3's syntax.

• How to define default tasks in Gulp 4? Use gulp.task('default', gulp.series(...)).

• Can I still use the Gulp plugin in Gulp 4? Yes, but some plugins may need to be updated.

• How to handle asynchronous tasks in Gulp 4? You can use the done callback, return stream, return promise, or use an asynchronous function.

• How to run tasks in a specific order in Gulp 4? Use the gulp.series() and gulp.parallel() methods.

• How to install Gulp 4? Run npm install gulp@4.0.0.

By migrating to Gulp.js 4.0, you can gain more powerful and flexible task management capabilities, thereby improving development efficiency.

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