.eslintrc.js

module.exports = {
  env: {
    browser: true,
    es2021: true,
  },
  ignorePatterns: ['!src/**/*'],
  parser: '@typescript-eslint/parser',
  plugins: ['@typescript-eslint'],
  extends: [
    'eslint:recommended',
    'plugin:@typescript-eslint/recommended',
    'prettier',
  ],
  // override max lines rule for test files
  overrides: [
    {
      files: ['**/*.test.ts'],
      rules: {
        'max-lines-per-function': 'off',
        'max-nested-callbacks': 'off',
        'max-statements': 'off',
      },
    },
  ],
  rules: {
    '@typescript-eslint/no-unused-vars': 2,
    '@typescript-eslint/no-explicit-any': 2,
    '@typescript-eslint/explicit-module-boundary-types': 2,
    '@typescript-eslint/semi': 2,
    semi: 2,
    'no-unused-vars': 2,
    'no-console': 2,
    'max-depth': [2, { max: 3 }],
    'max-lines-per-function': [
      2,
      { max: 40, skipComments: true, skipBlankLines: true },
    ],
    'max-nested-callbacks': [2, { max: 3 }],
    'max-statements': [2, { max: 9 }],
    'max-params': [2, { max: 4 }],
    'no-else-return': 2,
    'no-implicit-globals': 2,
    'no-lonely-if': 2,
    'no-multi-spaces': 2,
    'no-prototype-builtins': 2,
    'no-trailing-spaces': [2, { ignoreComments: false }],
    'no-undef': 2,
    'no-unneeded-ternary': 2,
    'no-unused-expressions': 2,
    'no-useless-catch': 2,
    'no-useless-computed-key': 2,
    'no-useless-return': 2,
    'no-var': 2,
    'no-warning-comments': 1,
    'object-shorthand': [2, 'always', { avoidQuotes: true }],
    'prefer-const': 2,
  },
};