.eslintrc.js

const fs = require('fs');

/**
 * Detect tsconfig file
 */
function getProjectFile() {
  if (fs.existsSync('./tsconfig.build.json')) return './tsconfig.build.json';
  if (fs.existsSync('./tsconfig.json')) return './tsconfig.json';
  return undefined;
}

module.exports = {
  root: true,
  parser: '@typescript-eslint/parser',
  plugins: ['json', 'jest', '@typescript-eslint', 'eslint-plugin', 'import'],
  env: {
    es6: true,
    node: true,
    'jest/globals': true,
  },
  globals: {
    BigInt: true,
  },
  parserOptions: {
    sourceType: 'module',
    createDefaultProgram: true,
    project: getProjectFile(),
  },
  extends: [
    'airbnb/base',
    'plugin:@typescript-eslint/recommended',
    'eslint:recommended',
    'prettier',
  ],
  rules: {
    'prefer-const': 'error',
    'mocha/handle-done-callback': 'off',
    'max-len': [
      'error',
      {
        code: 125,
      },
    ],
    indent: 'off',
    'import/named': 'off',
    'import/extensions': 'off',
    'no-empty-function': 'off',
    'no-plusplus': 'off',
    'prefer-promise-reject-errors': 'off',
    'implicit-arrow-linebreak': 'off',
    'function-paren-newline': 'off',
    'arrow-parens': 'off',
    'import/prefer-default-export': 'off',
    'import/no-cycle': 'off',
    'import/no-unresolved': 0,
    'import/no-import-module-exports': 0,
    'import/no-extraneous-dependencies': 0,
    'no-unused-expressions': 0,
    'no-nested-ternary': 0,
    'object-curly-newline': 0,
    'comma-dangle': 0,
    'dot-notation': 0,
    'no-useless-constructor': 'off',
    'no-useless-escape': 'off',
    semi: ['error', 'always'],
    'operator-linebreak': 'off',
    'space-before-function-paren': 'off',
    'no-await-in-loop': 'warn',
    'no-var-requires': 'off',
    'max-classes-per-file': 'off',
    'no-shadow': 'off',
    'no-cond-assign': 'warn',
    'class-methods-use-this': 'off',
    'no-bitwise': 'warn',
    camelcase: 'off',
    'no-promise-executor-return': 'warn',
    'no-underscore-dangle': 'off',

    /* TypeScript rules */
    '@typescript-eslint/no-shadow': ['error'],
    '@typescript-eslint/no-explicit-any': 'off',
    '@typescript-eslint/prefer-for-of': 'off',
    '@typescript-eslint/interface-name-prefix': 'off',
    '@typescript-eslint/explicit-function-return-type': 'off',
    '@typescript-eslint/explicit-module-boundary-types': 'off',
    '@typescript-eslint/no-var-requires': 'off',
    '@typescript-eslint/no-unused-vars': [
      'error',
      {
        vars: 'all',
        args: 'none', // none - do not check arguments
        ignoreRestSiblings: false,
      },
    ], // tslint:no-unused-variable
  },

  overrides: [
    {
      files: ['**/*.js'],
      rules: {
        '@typescript-eslint/no-unused-vars': 'off',
        '@typescript-eslint/no-misused-promises': 'off',
      },
    },
  ],
};