eslint.config.js

import js from '@eslint/js';
import stylistic from '@stylistic/eslint-plugin';
import svelte from 'eslint-plugin-svelte';
import globals from 'globals';
import ts from 'typescript-eslint';

export default ts.config(
  js.configs.recommended,
  ...ts.configs.recommended,
  ...svelte.configs['flat/recommended'],
  {
    languageOptions: {
      globals: {
        ...globals.browser,
        ...globals.node,
      },
    },
  },
  {
    files: ['**/*.svelte'],
    languageOptions: {
      parserOptions: {
        parser: ts.parser,
      },
    },
  },
  {
    plugins: {
      '@stylistic': stylistic,
    },
    rules: {
      '@stylistic/array-bracket-spacing': ['error', 'never'],
      '@stylistic/arrow-parens': ['error', 'always'],
      '@stylistic/block-spacing': 'error',
      '@stylistic/comma-dangle': ['error', 'always-multiline'],
      '@stylistic/eol-last': ['error', 'always'],
      '@stylistic/function-call-spacing': ['error', 'never'],
      '@stylistic/indent-binary-ops': ['error', 2],
      '@stylistic/indent': ['error', 2],
      '@stylistic/no-confusing-arrow': 'error',
      '@stylistic/no-extra-parens': 'error',
      '@stylistic/no-extra-semi': 'error',
      '@stylistic/no-floating-decimal': 'error',
      '@stylistic/no-mixed-operators': 'error',
      '@stylistic/no-mixed-spaces-and-tabs': 'error',
      '@stylistic/no-multi-spaces': 'error',
      '@stylistic/no-multiple-empty-lines': 'error',
      '@stylistic/no-trailing-spaces': 'error',
      '@stylistic/quotes': ['error', 'single'],
      '@stylistic/semi': ['error', 'always'],
      '@stylistic/template-curly-spacing': 'error',
      '@stylistic/type-annotation-spacing': 'error',
      '@stylistic/type-generic-spacing': 'error',
      '@stylistic/type-named-tuple-spacing': 'error',
    },
  },
  {
    rules: {
      'consistent-return': 'error',
      'eqeqeq': ['error', 'always'],
      'for-direction': 'error',
      'guard-for-in': 'error',
      'no-alert': 'error',
      'no-bitwise': 'error',
      'no-console': 'error',
      'no-else-return': 'error',
      'no-nested-ternary': 'error',
    },
  },
  {
    ignores: ['build/', '.svelte-kit/', 'dist/'],
  },
);