eslint.config.mjs

import js from '@eslint/js';
import globals from 'globals';

export default [
  js.configs.recommended,
  {
    files: ['**/*.js', '**/*.mjs'],
    languageOptions: {
      ecmaVersion: 'latest',
      sourceType: 'module',
      globals: {
        ...globals.browser,
      }
    },
    rules: {
       'accessor-pairs': 'error',
       'array-callback-return': 'warn',
       'arrow-spacing': 'warn',
       'block-scoped-var': 'error',
       'block-spacing': ['warn', 'always'],
       'brace-style': ['warn', '1tbs', { 'allowSingleLine': true }],
       'complexity': ['warn', 50],
       'curly': ['warn', 'multi-line'],
       'default-case-last': 'error',
       'default-param-last': 'error',
       'dot-notation': 'error',
       'eqeqeq': ['error', 'smart'],
       'func-call-spacing': ['warn', 'never'],
       'grouped-accessor-pairs': 'error',
       'indent': ['off', 4],
       'keyword-spacing': 'error',
       'linebreak-style': ['error', 'unix'],
       'no-await-in-loop': 'error',
       'no-caller': 'error',
       'no-catch-shadow': 'error',
       'no-console': 'warn',
       'no-constructor-return': 'error',
       'no-div-regex': 'error',
       'no-duplicate-imports': 'warn',
       'no-eq-null': 'error',
       'no-eval': 'error',
       'no-extend-native': 'error',
       'no-extra-bind': 'error',
       'no-extra-label': 'error',
       'no-floating-decimal': 'error',
       'no-global-assign': 'error',
       'no-implicit-coercion': ['warn', { 'boolean': false, 'number': false }],
       'no-implied-eval': 'error',
       'no-invalid-this': 'off',
       'no-iterator': 'error',
       'no-labels': 'error',
       'no-label-var': 'error',
       'no-lone-blocks': 'error',
       'no-loop-func': 'error',
       'no-loss-of-precision': 'error',
       'no-multi-str': 'error',
       'no-new': 'error',
       'no-new-func': 'error',
       'no-new-wrappers': 'error',
       'no-octal': 'error',
       'no-octal-escape': 'error',
       'no-process-env': 'error',
       'no-promise-executor-return': 'error',
       'no-proto': 'error',
       'no-prototype-builtins': 'off',
       'no-restricted-properties': 'error',
       'no-return-assign': 'off',
       'no-return-await': 'error',
       'no-script-url': 'error',
       'no-self-compare': 'error',
       'no-sequences': 'error',
       'no-shadow': 'off',
       'no-shadow-restricted-names': 'error',
       'no-template-curly-in-string': 'warn',
       'no-throw-literal': 'error',
       'no-trailing-spaces': 'warn',
       'no-undef': 'error',
       'no-undef-init': 'warn',
       'no-unexpected-multiline': 'error',
       'no-unneeded-ternary': 'error',
       'no-unmodified-loop-condition': 'error',
       'no-unreachable': 'warn',
       'no-unreachable-loop': 'warn',
       'no-unused-expressions': 'error',
       'no-unused-vars': 'warn',
       'no-use-before-define': ['off', 'nofunc'],
       'no-useless-backreference': 'warn',
       'no-useless-call': 'warn',
       'no-useless-computed-key': 'warn',
       'no-useless-concat': 'warn',
       'no-useless-constructor': 'warn',
       'no-useless-escape': 'off',
       'no-useless-rename': 'warn',
       'no-void': 'error',
       'no-warning-comments': 'warn',
       'no-whitespace-before-property': 'warn',
       'no-with': 'error',
       'quotes': ['error', 'single'],
       'radix': ['error', 'always'],
       'require-atomic-updates': 'error',
       'require-await': 'error',
       'semi': ['error', 'always'],
       'semi-spacing': 'error',
       'space-unary-ops': 'error',
       'wrap-regex': 'off'
    }
  },
  {
    files: ['test/**/*.js', 'test/**/*.mjs'],
    languageOptions: {
      globals: {
        ...globals.node,
        ...globals.jest,
        'before': 'readonly',
        'after': 'readonly',
        'd3': 'readonly',
        'iD': 'readonly',
        'vi': 'readonly',
        'sinon': 'readonly',
        'happen': 'readonly',
        'fetchMock': 'readonly',
        'jsdom': 'readonly',
        'expect': 'writable'
      }
    },
    rules: {
      'no-unused-expressions': 'off'
    }
  },
  {
    files: ['scripts/**/*.js', 'scripts/**/*.mjs', 'config/**/*.js', 'config/**/*.mjs'],
    languageOptions: {
      globals: {
        ...globals.node,
      }
    }
  }
];