When comparing Gulp vs Bower, the Slant community recommends Gulp for most people. In the question“What are the best tools for front-end JavaScript development?” Gulp is ranked 1st while Bower is ranked 8th. The most important reason people chose Gulp is:
Currently gulp offers a selection of 1000+ [plugins](http://gulpjs.com/plugins/) and it is growing rapidly.
Specs
Ranked in these QuestionsQuestion Ranking
Pros
Pro Large plugin ecosystem
Currently gulp offers a selection of 1000+ plugins and it is growing rapidly.
Pro Focuses on code instead of configuration
This depends on your style, but gulp is closer to the code, the actual execution isn't hidden by multiple layers and it's much easier to customize the build system without writing bloated modules. This also brings rather small configuration files.
Pro Allows creating task dependencies
Any task can be set to have other tasks as dependencies. The dependencies are specified through piping streams, and tasks run concurrently if they do not block in dependencies.
Pro It is possible to use projects that use streams without plugins
Since Gulp just uses streams at its core, you don't actually need a plugin wrapper to use a project that uses streams. If you use this approach, the you don't even have to worry about plugin maintenance at all, and get the bleeding edge updates as soon as they come out even if the plugin hasn't been updated. It also means if a project happens to not have a plugin, you don't need to write a new one, you can just use it as is.
Pro Streaming build system makes it easier to apply code transformations
In gulp, it's easy to pipe multiple steps together which you commonly need with build systems. For example, you may need to compile the javascript source files, then package them together, and then minify it. The streaming system makes this much easier.
Additionally, it improves performance since all operations are done in memory (compared to I/O operations) and avoids the need of unnecessarily compiling files (compared to Grunt that has to compile all files even if just one has changed).
Pro Chaining API that's simple and elegant
In Gulp, the transforms are performed through chains which makes it easier to understand the order of operations, and easier to modify it.
Pro Concurrency allows for high-speed perfomance
Because streams in Gulp use pipes to establish dependency order, they are parallel by default without having to rely on plugins or hacks.
Pro Minimizes disk operations for improved performance
Because Gulp is built using streams, it can store intermediate transformations in memory and defer writing to disk until the very end. This improves performance by not requiring expensive blocking disk operations for task dependencies.
Pro The configuration file is easily readable
Gulp's configuration file is actually very readable because it's actual JavaScript instead of a large file of JSON objects. The entry barrier is very low for developers who have never used a task runner before and it's API is very simple, with only 4 methods.
Pro Gulp modules are usable without Gulp
Because Gulp is built on top of the streaming API, you don't actually need gulp to use them. This could be helpful if you want to re-use those modules outside of gulp, possibly for testing, and using the same modules would be more consistent.
Pro Gulp tasks run from terminal
Pro Manages non-JavaScript components
Bower is flexible enough that you can manage pretty much any package you would need on the front-end, so you can manage all your dependencies with one tool, including CSS, boilerplate, fonts and more.
Pro Simplicity provides more flexibility
Bower doesn't try to handle too much of the workflow process, which means it's more flexible, and can be incorporated into more workflows. It tries to just do package management well and nothing else, which is why so many workflow wrappers support it. Because it doesn't try to do too much vertical integration, it also means that the list of supported components that it manages is huge.
Pro Largest front-end specific package registry
Although npm is the largest javascript package manager, Bower is the most popular one built specifically for the front-end. With over 16000 components in its registry, pretty much every component you can think of is supported.
Pro Easily integrates with other tools
Because of Bower's focus on simplicity, it makes it much easier to integrate with other tools, so it has a wide range of support with workflow wrappers and task managers such as yeoman and grunt.
Pro Requires a flat dependency tree
While nested dependencies are better for backend modules that need lots of inter-dependency, they lead to bloated file sizes. Flat dependencies are better for frontend optimization, where file size needs to be more closely managed.
Pro Does not store components in a registry
You always get package directly from owner's repository, i.e. you will always get latest version as soon as its version tag is committed without need of waiting until owner publishes updated package.
Pro Simpler to manage varied code
Because Bower makes few assumptions about the source and format of packages, it's easier to apply it to more of your packages
Pro AMD & CJS compatible
Bower strives to be as simple of a package manager as possible and puts as few restrictions on the packages in the registry as possible, making it the most flexible package manager with the most potential packages.
Cons
Con Dead
Gulp is dead, hasn't been updated in 4 years.
Con Rapidly changing API
While it's good that the gulp maintainers want the api to be as good as possible, it comes at the expense of stability. The upcoming gulp 4.0 release has another update to the way dependency management works which will require everyone to update their build scripts.
It also makes it hard to look up information on best practices as the best practices keep changing, making a lot of the blog posts and questions about gulp out of date.
Con You need to know some limitations that are not very intuitive
There are some features in Gulp which may not be very intuitive, or that otherwise should have been the default features instead of having to implement them through arguments. For example, to keep the correct folder structure when you are copying a file, you have to add {base: "lib/"}
as an argument.
Con No incremental building
Con Not suited for big and complex apps
Writing gulpfile for complex app which consists of many source types is very cumbersome and flawy process. You'll know when you want to move to webpack.
Con Seems like a redundant package manger
NPM with Webpack/Browserify can handle all the dependencies for both back-end and front-end. The only place where Bower may be useful is for projects which use libraries not supported by NPM, such as Polymer.
Con Deprecated
As of May 2017 Bower has been deprecated and will not receive any updates with new features. Bugs will still be fixed though for existing projects that use Bower.
Con Does not store components in a registry
Bower installs components directly from urls and repositories, which makes it more susceptible to components being taken down, with fewer guarantees about their availability.
Con Difficult to create bundles
To create a minified bundle of all the required JS dependencies other tools need to be used.
For example a JavaScript task runner which will automatically concatenate JavaScript files and minify them will be needed. Although it's done automatically, it's still extra work because the task runner needs to be configured.
Con Lack of signing of packages on the repository
Anyone can register their package on Bower's GIT registry - on one side, this brings a lot of ease to developers, but on the other hand, this can lead to security issues because the packages are not signed.
Con Less packages than npm due to a smaller ecosystem
- Bower: 36,000 packages
- Npm: 161,876 total packages (of course, many work only on the server)