oocss VS stylelint

Perhaps the most important CSS methodology to emerge during the web’s transition towards application-like websites was Object Oriented CSS (OOCSS), devised by Nicole Sullivan in 2009. Nicole’s now legendary article, ‘The Media Object Saves Hundreds of Lines of Code’, represented a fundamental rethinking on the composition of CSS rulesets and their relationship to HTML content. Instead of writing CSS styles around specific HTML content or basing styles on the location of content within the DOM, OOCSS prioritized writing reusable styling rules based on design patterns (in the case of the media object: ‘a fixed size media element (e.g. image or video) along with other variable size content (e.g. text)’). As perhaps the first instance of a CSS methodology systematically informed by a visual pattern language, OOCSS was also a critical step towards a more modular, reusable approach to writing CSS.

Component based CSS frameworks originating with OOCSS inherently limits selector scope to only elements inside the 'CSS object'.

OOCSS

OOCSS - Object Oriented CSS

OOCSS - (Object-oriented CSS) 2. Use a preprocessor. They fill the lacking features of CSS and helps you write more readable, and smaller reusable pieces of CSS. Some popular preprocessors are: 1. Sass 2. Less 3. Stylus 3. Reduce redundancy. You are using font-weight: bold for the header, but you are also setting it for the div inside. CSS stands for Cascading Style Sheets because styles in CSS are cascading, meaning child elements will inherit styles from parents. 4. Avoid using strong and complex selectors. You are using an id, but a class would do just fine. Having strong selectors means you will have a harder time overriding them later on if needed. 5. Avoid using !important as much as possible. Only use it for utility and helper classes if you must, which need to override anything, such as hiding or displaying an element. 6. Don't use inline CSS, unless your inlining critical CSS. Instead, import styles using a link tag in your head element. (Critical CSS refers to above-the-fold content. Inlining it can help users see a properly rendered page more quicker) 7. Use semantic HTML. You are assigning a header class to a div, which could have been an h1/2/3/n element. This not only helps in terms of accessibility but can also help to improve your SEO score. 8. Use rem for typography. You are using em which cascades, meaning if you set the root element to have 12px, a main element with 2em will have the font size of 24px. If you put a div inside of it with 2em, it will have a font size of 48px, meaning that the size is duplicated. This makes it hard to track down values for deeply nested elements. Instead, use rem which stands for root em, and does not cascade. 9. Make sure your formatting is consistent. You use opening brackets both after a selector and on a new line. Tools like stylelint can help you enforce certain rules to keep your code more consistent, which helps to improve readability and maintainability. 10. Outsource your colors / sizes / spacings into variables. Everything that is bound to change can be in a configuration file to make things more flexible. You can either use CSS variables for this, or a preprocessor. 11. Nothing is written in stone, feel free to come up with your own set of rules that helps you create a more dev-friendly environment. But most importantly, keep things consistent.

✨ BEM 💥 Object Oriented CSS 🌟 Atomic CSS

Another common way to extend configs in linters is using the extends key in the configuration file. Let's take StyleLint as an example:

Stylelint is similar to ESLint, but its focus is on styling rather than JavaScript. It helps you find errors in style files, such as old syntax or empty classes. We will also incorporate stylelint-config-clean-order to sort your style rules and group them consistently across the entire codebase.

The “cost of loading modules” diagram shows non-linear behaviour (though you should largely ignore the curve visible in the diagram because the x axis is way off linear):

• 0.15s ÷ 500 = 0.3ms

• 0.31s ÷ 1000 = 0.31ms

• 3.12s ÷ 10000 = 0.312ms

• 16.81s ÷ 25000 = 0.6724ms

• 48.44s ÷ 50000 = 0.9688ms

My own observation on a Surface Book six years ago was that in Node.js under Windows, each module had about 1ms of overhead when there was warm file system cache—that is, simply bundling with Rollup saved 1ms per file. If this sort of thing interests you, quite a lot of useful stuff came out of https://github.com/stylelint/stylelint/issues/2454 which I filed because I was unhappy with stylelint taking over a second to import. And that must have been only in the order of one or two thousand modules, when the behaviour is still close enough to linear.

As the property is still experimental, stylelint does not recognize it yet at the time of writing this, so let's explicitly disable the property-no-unknown rule only where we use it by adding a stylelint-disable comment and re-enable it afterwards.

Document your build process in a blog, use eslint, stylelint and jsx-a11y lint. Run a lighthouse performance test, follow the optimisation reccomendations.

Run static analysis e.g. lint with lockfile-lint, Stylelint, ESLint, check for unimported files using unimported, and identify potential security vulnerabilities

Stylelint

I use StyleLint (https://stylelint.io/) to lint my css/scss. I don't think that's a rule, but writing a custom rule isn't too tough. And you can use the vscode extension - https://marketplace.visualstudio.com/items?itemName=stylelint.vscode-stylelint

The complete code for this project is in the Rodney Lab GitHub repo. I do hope the post has either helped you with an existing project or provided some inspiration for a new one. As an extension, you can add all your favourite future CSS rules to the PostCSS config. Beyond PostCSS for linting your input CSS, consider trying stylelint.