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index.js
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index.js
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module.exports = {
extends: [
require.resolve('eslint-config-airbnb-base'),
require.resolve('./src/eslint-plugin-wc-export'),
'plugin:lit-a11y/recommended',
],
/**
* When import assertions are stage 4 and supported by eslint by default,
* we can remove the babel parser, `requireConfigFile` and `babelOptions` again
*/
parser: '@babel/eslint-parser',
parserOptions: {
ecmaVersion: 'latest',
requireConfigFile: false,
babelOptions: {
plugins: ['@babel/plugin-syntax-import-assertions'],
},
},
env: {
browser: true,
mocha: true,
},
plugins: ['lit', 'html', 'no-only-tests'],
rules: {
'arrow-parens': ['error', 'as-needed', { requireForBlockBody: true }],
'no-underscore-dangle': 'off',
// air bnb restricts for of loops, which we want to allow. we can't cherry pick it out, so we have to copy over the existing rules
'no-restricted-syntax': [
'error',
{
selector: 'ForInStatement',
message:
'for..in loops iterate over the entire prototype chain, which is virtually never what you want. Use Object.{keys,values,entries}, and iterate over the resulting array.',
},
{
selector: 'LabeledStatement',
message:
'Labels are a form of GOTO; using them makes code confusing and hard to maintain and understand.',
},
{
selector: 'WithStatement',
message:
'`with` is disallowed in strict mode because it makes code impossible to predict and optimize.',
},
],
'no-only-tests/no-only-tests': 'error',
'import/extensions': ['error', 'always', { ignorePackages: true }],
'import/prefer-default-export': 'off',
'import/no-extraneous-dependencies': [
'error',
{
devDependencies: [
'**/test/**/*.{html,js,mjs,ts}',
'**/stories/**/*.{html,js,mjs,ts}',
'**/demo/**/*.{html,js,mjs,ts}',
'**/*.config.{html,js,mjs,ts}',
'**/*.conf.{html,js,mjs,ts}',
'**/.storybook/*.{html,js,mjs,cjs,ts}',
],
},
],
'class-methods-use-this': [
'error',
{
exceptMethods: [
// web components life cycle
'connectedCallback',
'disconnectedCallback',
// LitElement life cycle
'performUpdate',
'shouldUpdate',
'firstUpdated',
'update',
'updated',
'createRenderRoot',
'render',
],
},
],
// eslint-plugin-lit
'lit/no-template-bind': 'error',
'lit/no-duplicate-template-bindings': 'error',
'lit/no-useless-template-literals': 'error',
'lit/attribute-value-entities': 'error',
'lit/binding-positions': 'error',
'lit/no-invalid-html': 'error',
'lit/no-value-attribute': 'error',
'lit/no-invalid-escape-sequences': 'error',
'lit/no-legacy-template-syntax': 'error',
'lit/no-private-properties': 'error',
'lit/no-native-attributes': 'error',
'lit/no-classfield-shadowing': 'error',
'lit/lifecycle-super': 'error',
},
settings: {
// Adds compatibility for eslint-plugin-import in combination with flat config
// See: https://github.com/import-js/eslint-plugin-import/issues/2556#issuecomment-1419518561
'import/parsers': {
espree: ['.js', '.cjs', '.mjs', '.jsx'],
'@typescript-eslint/parser': ['.ts'],
},
'import/resolver': {
[require.resolve('eslint-plugin-import-exports-imports-resolver')]: {},
},
},
overrides: [
{
files: [
'**/test/**/*.{html,js,mjs,ts}',
'**/demo/**/*.{html,js,mjs,ts}',
'**/stories/**/*.{html,js,mjs,ts}',
],
rules: {
'no-console': 'off',
'no-unused-expressions': 'off',
'class-methods-use-this': 'off',
// loosen templating restrictions in tests and demos
'lit/no-template-bind': 'off',
'lit/no-duplicate-template-bindings': 'off',
'lit/no-useless-template-literals': 'off',
'lit/binding-positions': 'off',
'lit/no-invalid-html': 'off',
'lit/no-private-properties': 'off',
},
},
],
};