gulpseries

gulp.series is a utility function in the Gulp build system that enables sequential execution of tasks in a build pipeline. Introduced with Gulp 4, it returns a function that, when invoked, runs the specified tasks one after another, ensuring that each task completes before the next begins. Tasks passed to gulp.series can be named tasks, task functions, or a mix; a task can signal completion by returning a stream, a promise, or by invoking a callback.

Usage typically involves composing existing tasks into a single, reusable workflow. For example, a common pattern is to define individual tasks such as cleaning, compiling, and bundling, then export a combined sequence as a single task: exports.build = gulp.series(clean, compile, bundle). The same approach can be used with named tasks: exports.default = gulp.series('clean', 'compile', 'bundle'). Because gulp.series respects asynchronous completion, it will wait for each task to finish before starting the next.

If a task fails or rejects a promise, the entire series stops and the error propagates to the caller. This makes gulp.series a reliable way to enforce order and error handling in build processes. It is commonly used alongside gulp.parallel, which executes tasks concurrently, offering a contrast between strict sequencing and parallel execution. gulp.series is part of the core Gulp 4 API and is not available in Gulp 3, where run-sequence or similar workarounds were used. In practice, gulp.series helps organize complex workflows into clear, maintainable steps.