eslint.config.js

import js from '@eslint/js';
import stylistic from '@stylistic/eslint-plugin';
import tseslintPlugin from '@typescript-eslint/eslint-plugin';
import tseslintParser from '@typescript-eslint/parser';
import { defineConfig } from 'eslint/config';
import globals from 'globals';
import bangSpaceIf from './eslint/bang-space-if.js';
import controlStructureSpacing from './eslint/control-structure-spacing.js';
import spaceUnaryOpsWithException from './eslint/space-unary-ops-with-exception.js';

export const rules = {
    'no-invalid-this': 'error',
    'no-unused-vars': ['error', {
        vars: 'all',
        args: 'after-used',
        caughtErrors: 'none',
        ignoreRestSiblings: false,
        ignoreUsingDeclarations: false,
        reportUsedIgnorePattern: false,
        argsIgnorePattern: '^_',
        destructuredArrayIgnorePattern: '^_',

    }],
    curly: ['error', 'multi-line'],
    '@stylistic/curly-newline': ['error', 'always'],
    '@stylistic/object-curly-spacing': ['error', 'always'],
    '@stylistic/indent': ['error', 4, {
        CallExpression: {
            arguments: 4,
        },
    }],
    '@stylistic/indent-binary-ops': ['error', 4],
    '@stylistic/array-bracket-newline': ['error', 'consistent'],
    '@stylistic/semi': ['error', 'always'],
    '@stylistic/quotes': ['error', 'single', { 'avoidEscape': true }],
    '@stylistic/function-call-argument-newline': ['error', 'consistent'],
    '@stylistic/arrow-spacing': ['error', { before: true, after: true }],
    '@stylistic/space-before-function-paren': 'error',
    '@stylistic/key-spacing': ['error', { 'beforeColon': false, 'afterColon': true }],
    '@stylistic/keyword-spacing': ['error', { 'before': true, 'after': true }],
    '@stylistic/no-multiple-empty-lines': ['error', { max: 1, maxEOF: 0 }],
    '@stylistic/comma-spacing': ['error', { 'before': false, 'after': true }],
    '@stylistic/comma-dangle': ['error', 'always-multiline'],
    '@stylistic/object-property-newline': ['error', { allowAllPropertiesOnSameLine: true }],
    '@stylistic/dot-location': ['error', 'property'],
    '@stylistic/space-infix-ops': ['error'],
    'no-undef': 'error',
    'custom/control-structure-spacing': 'error',
    'custom/bang-space-if': 'error',
    '@stylistic/no-trailing-spaces': 'error',
    '@stylistic/space-before-blocks': ['error', 'always'],
    'prefer-template': 'error',
    '@stylistic/no-mixed-spaces-and-tabs': ['error', 'smart-tabs'],
    'custom/space-unary-ops-with-exception': ['error', { words: true, nonwords: false }],
    '@stylistic/no-multi-spaces': ['error', { exceptions: { 'VariableDeclarator': true } }],
    '@stylistic/type-annotation-spacing': 'error',
    '@stylistic/type-generic-spacing': 'error',
    '@stylistic/type-named-tuple-spacing': ['error'],
    'no-use-before-define': ['error', {
        'functions': false,
    }],
};

const tsRules = {
    '@typescript-eslint/no-explicit-any': 'warn',
    '@typescript-eslint/no-unused-vars': ['error', { argsIgnorePattern: '^_', caughtErrors: 'none' }],
    '@typescript-eslint/ban-ts-comment': 'warn',
    '@typescript-eslint/consistent-type-definitions': ['error', 'interface'],
};

const sharedPlugins = {
    js,
    '@stylistic': stylistic,
    custom: {
        rules: {
            'control-structure-spacing': controlStructureSpacing,
            'bang-space-if': bangSpaceIf,
            'space-unary-ops-with-exception': spaceUnaryOpsWithException,
        },
    },
};

const sharedJsConfig = {
    rules,
    plugins: sharedPlugins,
};

const recommendedJsConfig = {
    ...sharedJsConfig,
    extends: ['js/recommended'],
};

const createTsConfig = ({ files, project, ignores = [], globals: tsGlobals }) => ({
    files,
    ignores,
    languageOptions: {
        parser: tseslintParser,
        ...(tsGlobals ? { globals: tsGlobals } : {}),
        parserOptions: {
            ecmaVersion: 'latest',
            sourceType: 'module',
            project,
        },
    },
    plugins: {
        '@typescript-eslint': tseslintPlugin,
    },
    rules: tsRules,
});

const backendConfig = {
    ...recommendedJsConfig,
    files: [
        'src/backend/**/*.{js,mjs,cjs,ts}',
        'src/putility/**/*.{js,mjs,cjs,ts}',
    ],
    ignores: [
        '**/*.test.js',
        '**/*.test.ts',
        '**/*.test.mts',
    ],
    languageOptions: { globals: globals.node },
};

const testConfig = {
    ...sharedJsConfig,
    files: [
        '**/*.test.js',
        '**/*.test.ts',
        '**/*.test.mts',
    ],
    languageOptions: { globals: { ...globals.node, ...globals.vitest } },
};

const extensionConfig = {
    ...recommendedJsConfig,
    files: ['extensions/**/*.{js,mjs,cjs,ts}'],
    languageOptions: {
        globals: {
            extension: 'readonly',
            config: 'readonly',
            global_config: 'readonly',
            ...globals.node,
        },
    },
};

const frontendConfig = {
    ...recommendedJsConfig,
    files: ['**/*.{js,mjs,cjs,ts}', 'src/gui/src/**/*.js'],
    ignores: [
        'src/backend/**/*.{js,mjs,cjs,ts}',
        'extensions/**/*.{js,mjs,cjs,ts}',
        'submodules/**',
        '**/*.test.{js,ts,mts,mjs}',
        '**/*.min.js',
        '**/*.min.cjs',
        '**/*.min.mjs',
        '**/socket.io.js',
        '**/dist/*.js',
        'src/gui/src/lib/**',
        'src/gui/dist/**',
    ],
    languageOptions: {
        globals: {
            ...globals.browser,
            ...globals.jquery,
            i18n: 'readonly',
            puter: 'readonly',
        },
    },
};

export default defineConfig([
    createTsConfig({
        files: ['**/*.test.ts', '**/*.test.mts', '**/*.test.setup.ts'],
        ignores: ['tests/playwright/tests/**/*.ts'],
        project: './tests/tsconfig.json',
        globals: { ...globals.node, ...globals.vitest },
    }),
    createTsConfig({
        files: ['**/*.ts'],
        ignores: ['**/*.test.ts', '**/*.test.mts', 'extensions/**/*.ts'],
        project: './tsconfig.json',
    }),
    createTsConfig({
        files: ['extensions/**/*.ts'],
        project: './extensions/tsconfig.json',
    }),
    backendConfig,
    testConfig,
    extensionConfig,
    frontendConfig,
]);