When comparing Duo vs Component, the Slant community recommends Duo for most people. In the question“What are the best open source front-end package managers?” Duo is ranked 6th while Component is ranked 10th. The most important reason people chose Duo is:
Because Duo allows you to require dependencies directly in your html, css, and javascript, you don't need to manage annoying build processes. Duo automatically supports preprocessed languages like Coffeescript and Sass, and automatically bundles them into a single file, making it an easy-to-use, all-in-one tool. All you have to do is run `duo in > out` and you're done!
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Pros
Pro Handles the entire build and packaging process for you
Because Duo allows you to require dependencies directly in your html, css, and javascript, you don't need to manage annoying build processes. Duo automatically supports preprocessed languages like Coffeescript and Sass, and automatically bundles them into a single file, making it an easy-to-use, all-in-one tool. All you have to do is run duo in > out
and you're done!
Pro Allows you to directly require dependencies from Javascript, HTML, and CSS
With Duo you don't need to manage a separate dependency file, you just require projects from your files where you need them. It works with all front-end languages, giving you powerful inline Javascript, HTML, CSS, and even JSON management in a way that no other package manager supports.
Pro Require directly from github
Duo allows you to use require
to import packages directly from github using the username/package_name@version
syntax. The version is optional, in case you want to test out a new package quickly.
Pro Built on top of Component
Duo can be seen as an easier to use, more feature complete wrapper around component.
Pro Supports both Bower and Component packages
Duo is primarily designed to support Component packages, but Bower package support is available with npm support planned, so you can use Duo with libraries as well as components.
Pro Vertically integrated with the build process
Component handles more than just package management; it also deals with the build process and bundling, so you don't have to find and manage a separate solution. This lets you get up and running faster with less to worry about.
Pro Also manages non javascript components
Components can be html snippets or css in addition to Javascript, and are treated as first class objects by being converted into Javascript modules that load styles and markup as strings.
Pro Components are more structured and thus have more inter-compatibility
Components can be javascript, style and markup, they are bundled in a way that makes it possible to load in entire UI chunks. This means less flexibility, but the components that are available are easier to work with.
Pro Designed with ES6 modules and Web Components in mind
Component is designed as a current-day solution for the currently proposed ES6 modules and Web Components, making it more in-line with the direction the web is going in the future.
Pro Encourages simpler and smaller components
Components are encouraged by convention to be small and single-use, meaning that the packages in the community's ecosystem are easier to use and combine together. More complex components use dependency resolution to compose smaller components so that components stay limited in scope.
Pro Easy dependency management
Component provides you with a flat dependency tree. This results in easy dependency management. A flat dependency tree is important for file size optimization, so you don't end up loading multiple copies of the same library, or deeply nested dependencies that bloat up.
Cons
Con Harder to manage versions between files
Because versions and dependencies can be specified inline, it might be harder to update your packages when you want to upgrade. (However, it is possible to specify dependencies in a JSON file.)
Con Cannot extract modules from a bundle and put into another one
As for common modules shared by multiple pages, duo.js cannot extract and put them into another bundle which is loaded commonly. On the other hand, modules modified rarely should put into another bundle so they can be still cached when other modules change.
Con No longer maintained
Component is no longer being developed/maintained, so there will be no new features or bug fixes.
Con Cannot add modules that are not on Github
While using Github as a backend database for Component makes things a lot easier, as there's no need to add other authorization credentials to use modules, it means that modules that aren't on Github cannot be added.