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eslint.config.mjs
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eslint.config.mjs
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import { fixupPluginRules } from '@eslint/compat';
import { FlatCompat } from '@eslint/eslintrc';
import eslint from '@eslint/js';
import unicorn from 'eslint-plugin-unicorn';
// eslint-disable-next-line import/no-unresolved
import tseslint from 'typescript-eslint';
const compat = new FlatCompat({
baseDirectory: import.meta.dirname,
});
const OFF = 0;
const WARN = 1;
const ERROR = 2;
export default tseslint.config(
eslint.configs.recommended,
...compat.extends('airbnb-base').map((config) => ({
...config,
plugins: {}, // delete
})),
...compat.extends('airbnb-typescript/base'),
...tseslint.configs.strictTypeChecked,
...tseslint.configs.stylisticTypeChecked,
// @ts-expect-error - no types
// eslint-disable-next-line
unicorn.configs['flat/recommended'],
{
linterOptions: {
reportUnusedDisableDirectives: WARN,
},
languageOptions: {
parserOptions: {
project: ['tsconfig.json', 'tsconfig.node.json'],
tsconfigRootDir: import.meta.dirname,
},
},
plugins: {
import: fixupPluginRules(
compat.plugins('eslint-plugin-import')[0].plugins?.import ?? {},
),
},
rules: {
'@typescript-eslint/explicit-module-boundary-types': ERROR,
'@typescript-eslint/no-confusing-void-expression': WARN,
'@typescript-eslint/no-non-null-assertion': WARN,
'@typescript-eslint/no-use-before-define': WARN,
'import/prefer-default-export': OFF,
'no-restricted-syntax': OFF,
'no-void': OFF,
'unicorn/filename-case': OFF,
'unicorn/import-style': WARN,
'unicorn/no-abusive-eslint-disable': WARN,
'unicorn/no-null': OFF,
'unicorn/prefer-module': WARN,
'unicorn/prefer-top-level-await': WARN,
'unicorn/prevent-abbreviations': OFF,
/* Covered by biome formatter */
'@typescript-eslint/indent': OFF,
'function-paren-newline': OFF,
'implicit-arrow-linebreak': OFF,
'max-len': OFF,
'object-curly-newline': OFF,
'operator-linebreak': OFF,
'unicorn/no-nested-ternary': OFF,
/* Performance and byte savings */
// alternatives offer byte savings and better performance
'@typescript-eslint/prefer-string-starts-ends-with': OFF,
// byte savings (but reduces debugging ability)
'@typescript-eslint/restrict-plus-operands': OFF,
// byte savings (but reduces debugging ability)
'@typescript-eslint/restrict-template-expressions': OFF,
// byte savings with same performance
'prefer-template': OFF,
// byte savings
'no-plusplus': OFF,
// byte savings + faster
'unicorn/explicit-length-check': OFF,
'unicorn/no-array-callback-reference': OFF,
// forEach is slower but more compact (for non-performance-critical code)
'unicorn/no-array-for-each': OFF,
'unicorn/no-await-expression-member': OFF,
// indexOf is faster (in Chrome)
'unicorn/prefer-includes': OFF,
// saves 3 bytes to use arrow function
'unicorn/prefer-native-coercion-functions': OFF,
// byte savings (minification doesn't currently automatically remove)
'unicorn/switch-case-braces': [ERROR, 'avoid'],
/* stage1 */
// underscores in synthetic event handler names
'no-underscore-dangle': OFF,
'unicorn/prefer-add-event-listener': OFF,
'unicorn/prefer-dom-node-append': OFF,
'unicorn/prefer-query-selector': OFF,
},
},
{
files: [
'*.config.mjs',
'*.config.ts',
'*.d.ts',
'**/*.spec.ts',
'**/*.test.ts',
'build.ts',
'test/**',
],
rules: {
'import/no-extraneous-dependencies': OFF,
},
},
{
files: ['build.ts'],
rules: {
'no-await-in-loop': OFF,
'no-console': OFF,
},
},
{
ignores: ['**/*.bak', 'dist/**'],
},
);