eslint.userscript.config.js

import globals from 'globals';
import prettier from 'eslint-config-prettier/flat';
import userscripts from 'eslint-plugin-userscripts';

export default [
    prettier,
    {
        plugins: { userscripts: { rules: userscripts.rules } },
        languageOptions: {
            ecmaVersion: 'latest',
            sourceType: 'script',
            globals: {
                ...globals.browser,
                ...globals.es2024,
                ...globals.greasemonkey,
            },
            parserOptions: {
                exmaFeatures: { globalReturn: true },
                allowAwaitOutsideFunction: true,
            },
        },
        rules: {
            ...userscripts.configs.recommended.rules,
            // These are the rules that Tampermonkey uses
            // https://github.com/Tampermonkey/tampermonkey/issues/1686#issuecomment-1403657330
            'curly': [1, 'multi-line'],
            'dot-location': 0,
            'dot-notation': [1, { allowKeywords: true }],
            'no-caller': 1,
            'no-case-declarations': 2,
            'no-div-regex': 0,
            'no-empty-pattern': 2,
            'no-eq-null': 0,
            'no-eval': 1,
            'no-extra-bind': 1,
            'no-fallthrough': 1,
            'no-implicit-globals': 2,
            'no-implied-eval': 1,
            'no-lone-blocks': 1,
            'no-loop-func': 1,
            'no-multi-spaces': 1,
            'no-multi-str': 1,
            'no-native-reassign': 1,
            'no-octal-escape': 2,
            'no-octal': 2,
            'no-proto': 1,
            'no-redeclare': 2,
            'no-return-assign': 1,
            // 'no-sequences': 1, // we do have several comma operators in use due to polyfills. Any way to remove them?
            'no-undef': 1,
            'no-useless-call': 1,
            'no-useless-concat': 1,
            'no-with': 1,
        },
    },
];