prettier-config

Linting Prettier

Use Prettier to format your JS, CSS and HTML code.

::: tip This is part of the default open-wc recommendation :::

Setup

npm init @open-wc
# Upgrade > Linting

Manual

• Install @open-wc/prettier-config.

  yarn add --dev @open-wc/prettier-config

• Create prettier.config.js in the root directory of your project.

  module.exports = require('@open-wc/prettier-config');

• Add the following scripts to your package.json

  "scripts": {
    "lint:prettier": "prettier \"**/*.js\" --list-different || (echo '↑↑ these files are not prettier formatted ↑↑' && exit 1)",
    "format:prettier": "prettier \"**/*.js\" --write",
  },

• Update your .eslintrc.js to look like this:

  module.exports = {
    extends: ['@open-wc/eslint-config', 'eslint-config-prettier'].map(require.resolve),
  };

What you get

• Apply formatting to JS files
• Apply formatting to HTML inside of html tagged template literals used by lit-html
• Apply formatting to CSS inside of css tagged template literals used by lit-element
• Integration with ESLint to prevent potentially conflicting rules

Usage

Run:

• npm run lint:prettier to check if your files are correctly formatted
• npm run format:prettier to auto format your files

Linting Error Examples

$ npm run lint:prettier

test/set-card.test.js
test/set-game.test.js
↑↑ these files are not prettier formatted ↑↑

Simply run npm run format:prettier to format your files automatically.

<script> export default { mounted() { const editLink = document.querySelector('.edit-link a'); if (editLink) { const url = editLink.href; editLink.href = url.substr(0, url.indexOf('/master/')) + '/master/packages/prettier-config/README.md'; } } } </script>