.eslintrc.js

module.exports = {
  extends: [
    'eslint:recommended',
    'plugin:@typescript-eslint/recommended',
    'plugin:prettier/recommended',
  ],
  plugins: ['@typescript-eslint', 'prettier'],
  parser: '@typescript-eslint/parser',
  env: {
    browser: true,
    node: true,
  },
  rules: {
    'prettier/prettier': 'error',
    'import/prefer-default-export': 'off',
    indent: 'off',
    'implicit-arrow-linebreak': 'off', // conflicts with prettier
    'no-unused-expressions': 'off', // breaks optional chaining
    '@typescript-eslint/no-unused-expressions': 'error',
    'max-len': ['error', { code: 120 }],
    '@typescript-eslint/no-empty-function': 'off',
    'no-shadow': 'off',
    '@typescript-eslint/no-shadow': 'error',
    '@typescript-eslint/explicit-function-return-type': 'off',
    '@typescript-eslint/no-non-null-assertion': 'error',
    'operator-linebreak': 'off',
    'no-param-reassign': ['error', { props: false }],
    'object-curly-newline': 'off',
  },
};