.eslintrc.js

module.exports = {
  root: true,
  env: {
    node: true,
    browser: true,
  },
  parser: '@typescript-eslint/parser',
  extends: ['eslint:recommended', 'plugin:@typescript-eslint/recommended'],
  plugins: ['svelte3', '@typescript-eslint'],
  overrides: [
    {
      files: ['*.svelte'],
      processor: 'svelte3/svelte3',
    },
    {
      files: ['*.ts', '*.json'],
      extends: [
        'plugin:@typescript-eslint/recommended',
        'plugin:prettier/recommended',
      ],
      rules: {
        '@typescript-eslint/no-sequences': 'off',
        '@typescript-eslint/no-unused-vars': [
          'error',
          { argsIgnorePattern: '^_' },
        ],
      },
    },
  ],
  settings: {
    'svelte3/typescript': require('typescript'), // pass the TypeScript package to the Svelte plugin
  },
  ignorePatterns: ['service-worker.ts'],
  rules: {
    'no-undef': ['error'],
    'no-unused-vars': 'off',
    'no-sequences': 'off',
    '@typescript-eslint/no-sequences': 'off',
    '@typescript-eslint/no-unused-vars': ['error'],
  },
}