stylelint VS jest

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.

There are several testing approaches you can take to ascertain the functionality of the auth API. One way would be to automate the testing using unit tests with tools like Jest and Supertest. Alternatively, you can make use of API clients like Postman or the Thunder Client VS Code extension to test the API.

GitHub | Website

Jest

you have selected a testing framework. In my case, it's Jest with Supertest

Jest, created and maintained by Facebook, is a JavaScript testing framework with a focus on simplicity. It is often recognized for its zero-configuration setup and seamless integration, especially with React applications, making it a favored choice for developers in both small-scale projects and large enterprise applications.

Jest (https://jestjs.io/)

console.error Jest encountered an unexpected token Jest failed to parse a file. This happens e.g. when your code or its dependencies use non-standard JavaScript syntax, or when Jest is not configured to support such syntax. Out of the box Jest supports Babel, which will be used to transform your files into valid JS based on your Babel configuration. By default "node\_modules" folder is ignored by transformers. Here's what you can do: • If you are trying to use ECMAScript Modules, see https://jestjs.io/docs/ecmascript-modules for how to enable it. • If you are trying to use TypeScript, see https://jestjs.io/docs/getting-started#using-typescript • To have some of your "node\_modules" files transformed, you can specify a custom "transformIgnorePatterns" in your config. • If you need a custom transformation specify a "transform" option in your config. • If you simply want to mock your non-JS modules (e.g. binary assets) you can stub them out with the "moduleNameMapper" config option. You'll find more details and examples of these config options in the docs: https://jestjs.io/docs/configuration For information about custom transformations, see: https://jestjs.io/docs/code-transformation

Note: I will be using Jest as testing framework throughout the examples.

We use Jest Framework for testing. Jest is not a dogma, and, of course, in its place can be any other test runner, such as Mocha or Ava. Let's focus on tests. I'll provide a short example because I don’t want to waste your time. You can find the full version here. It's crucial to read the comments in the code below. Let's go!

Jest has long been my favorite got to test runner when it comes to UI unit and integration testing. With tools like React Testing Library (Testing Library framework for React) you get the benefit of very easy to write and maintain tests, as well as a quick and efficient way to run our tests.