stylelint-config-svelte-roboleary

My stylelint config for linting svelte files. Works with v14+.

It extends stylelint-config-html to make svelte files parseable, and my own default config stylelint-config-roboleary.

This can be used along side Prettier (which is used by the VS Code Svelte extension), all conflicting rules are disabled.

Usage

1. Install this package along with stylelint npm install -D stylelint-config-svelte-roboleary as devDependencies.

2. Create a stylelint config in your project directory e.g. .stylelintrc. Add the following to the file:

   {
     "extends": ["stylelint-config-svelte-roboleary"]
   }

3. You can add scripts to your package.json to lint and fix your code from the command-line:

   {
        "scripts": {
          "lint": "npx stylelint **/*.svelte",
          "lint:fix": "npm run style-lint -- --fix",
        }
   }

4. Additionally, there are integrations for code editors. I use the stylelint extension for VS Code.

Configuration in VS Code

The Svelte for VS Code extension uses Prettier under the hood for code formatting. This config ensures that stylelint rules and Prettier's default rules don't interfere when formatting the code.

I find it better to run linting and formatting as code actions. This way it is possible to run linting and formatting as a series of actions: lint first, then format.

I have installed 3 extensions for linting CSS and formatting code on any project:

• stylelint,
• Prettier, and
• Format Code Action.

To lint and format your svelte code on save, you can update your user settings with the following:

{
	"editor.formatOnSave": false,
	"css.validate": false,
  "less.validate": false,
  "scss.validate": false,
  "stylelint.validate": ["css", "less", "postcss", "svelte", "vue"],
  "editor.defaultFormatter": "esbenp.prettier-vscode",
  "editor.codeActionsOnSave": ["source.formatDocument", "source.fixAll"],
  "[svelte]": {
    "editor.defaultFormatter": "svelte.svelte-vscode"
  },
}

We disable VS Code's builtin formatting for CSS-like syntaxes here too (css.validate). From v14+ of stylelint, we must explicitly declare what languages we want stylelint to lint via stylelint.validate.

You can try out this project which has stylelint set-up correctly to test your configuration: https://github.com/robole/svelte-todo-with-tests.

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