eslint.config.js

import { includeIgnoreFile } from '@eslint/compat';
import js from '@eslint/js';
import prettier from 'eslint-config-prettier';
import compat from 'eslint-plugin-compat';
import svelte from 'eslint-plugin-svelte';
import { defineConfig } from 'eslint/config';
import globals from 'globals';
import path from 'node:path';
import ts from 'typescript-eslint';
import svelteConfig from './svelte.config.js';

const gitignorePath = path.resolve(import.meta.dirname, '.gitignore');

export default defineConfig(
  includeIgnoreFile(gitignorePath),
  js.configs.recommended,
  ...ts.configs.recommended,
  ...svelte.configs.recommended,
  prettier,
  ...svelte.configs.prettier,
  compat.configs['flat/recommended'],
  {
    languageOptions: { globals: { ...globals.browser, ...globals.node } },
    settings: {
      polyfills: [
        // Web Serial API is feature-detected at runtime (see src/lib/utils/compatibility.ts)
        'navigator.serial',
      ],
    },
    rules: {
      // typescript-eslint strongly recommend that you do not use the no-undef lint rule on TypeScript projects.
      // see: https://typescript-eslint.io/troubleshooting/faqs/eslint/#i-get-errors-from-the-no-undef-rule-about-global-variables-not-being-defined-even-though-there-are-no-typescript-errors
      'no-undef': 'off',
      'no-control-regex': 'off',
      'no-misleading-character-class': 'off',
      'no-useless-assignment': 'warn',
      'svelte/no-unused-svelte-ignore': 'off',
      '@typescript-eslint/no-unused-vars': [
        'warn',
        { argsIgnorePattern: '^_', varsIgnorePattern: '^_', caughtErrorsIgnorePattern: '^_' },
      ],
    },
  },
  {
    files: ['**/*.svelte', '**/*.svelte.ts', '**/*.svelte.js'],
    languageOptions: {
      parserOptions: {
        extraFileExtensions: ['.svelte'],
        parser: ts.parser,
        svelteConfig,
      },
    },
  },
  {
    ignores: [
      '.DS_Store',
      'node_modules',
      '/build',
      '/.svelte-kit',
      '/package',
      '.env',
      '.env.*',
      '!.env.example',
      'pnpm-lock.yaml',
      'package-lock.json',
      'yarn.lock',
      'src/lib/api/internal',
      'src/lib/components/ui',
    ],
  }
);