ESLint VS stylelint

Let's be honest - setting up tools for a new project can be a frustrating process. Especially when you want to jump straight to coding part. This is often the case with ESLint and Prettier, two popular tools in the JavaScript ecosystem that can sometimes interfere with each other when it comes to code formatting. Fortunately, there's a simple solution to this process, and it's called eslint-plugin-prettier.

Do you have the need to find and fix problems in your JavaScript? Then ESLint is for you. With over 120 million downloads each month, it's definitely one of the most popular projects out there. The latest version introduces a new configuration system, designed to simplify available configuration options. Old and deprecated rules have been removed, and a new configuration inspector has been added. Check out the blog for all the highlights, and a migration guide.

ESLint: A pluggable and configurable linter tool for identifying and reporting on patterns in JavaScript.

Automating code checks with static code analysis allows us to enforce code styling effectively. By integrating tools into our workflow, we can identify errors at an early stage, while coding instead of blocking us at the end. For instance, flake8 checks Python code for style and errors, eslint performs similar checks for JavaScript, and prettier automatically formats code to maintain consistency.

If you're a developer, you're surely familiar with Prettier and ESLint. With over 8 years of existence, they have established themselves as references in the JavaScript ecosystem.

eslint is used to avoid code errors

No lint errors: The committed code does not contain any lint errors (eslint).

Let’s walk through the steps for a one-time setup to configure husky pre-commit and pre-push hooks, ESLint with code styles conventions, prettier code formatter, and lint-staged. Husky automatically runs a script on each commit or push. This is useful for linting files to enforce code styles that keeps the entire code base following conventions.

GitHub | Website

ESLint: A pluggable and configurable linter tool for identifying and reporting on patterns in JavaScript.

There are more linting tools that I won't go into deeply, but you can integrate them with lint-staged. For example, you can lint your CSS content with Stylelint, or even lint your README files with markdownlint, etc.

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.