Note: The best practices presented here are about polymer, but you can follow these recommendations for any Web Components or other type of component based on Libraries or frameworks (like React or any other).
Tip: For open source projects see the Open Source Checklist.
- Make reusable and composable
- Cover the basics
- Make maintainable
- Improve performance
- A11y
- Make customizable
- Document all
- Publish to the world
- Resources for learning
- Learn the 17 Rules of Unix philosophy.
- Learn about Atomic Design.
- Make Responsive.
- When necessary, think in Progressive enhancement.
- Follow the Semantic Versioning.
- Use
_as a prefix convention for private methods. - Lint with eslint.
- Lint with polylint.
- Write unit tests with Web Component Tester WCT.
- Write the UI regression test with whatever you want.
- Run the tests in all browser with Selenium and Source Labs.
- Integrate all tests with CI.
- Optimize first paint.
- Write a test for first paint performance.
- Implement do less & be lazy concepts.
- Add Aria labels.
- Use the focus event.
- Think in tab index order.
- Test all with Accessibility Developer Tools.
Make customizable
- Use custom properties and expose the API for users with docs.
- Use @apply rule for most generic style and expose the API for users with docs.
- Provide a quick demo (like webcomponents.org inline demo).
- Provide a full demo (Polymer iron-demo-helpers is recommended).
- Describe how to download and use the component.
- Describe how to style the component.
- Specify the component support.
- Describe your API. (example)
- Describe how to run the development environment.
- Describe how to run all the tests.
- Publish in bower.
- Publish in webcomponents.org following the requirements.