.eslintrc.js

module.exports = {
  'root': true,

  'plugins': [ '@typescript-eslint' ],

  'env': {
    'es6': true,
    'browser': true,
    'commonjs': true
  },

  'parser': '@typescript-eslint/parser',

  'parserOptions': {
    'sourceType': 'module',
    'ecmaVersion': 2017
  },

  'extends': [
    'eslint:recommended',
    'plugin:@typescript-eslint/recommended',
    'plugin:@typescript-eslint/eslint-recommended',
    'plugin:react/recommended',
    'plugin:react/jsx-runtime'
  ],

  'globals': {
    'process': true // since gulp has envify
  },

  'rules': {
    // basics
    'indent': [ 'error', 2, { // indentation should be 2 spaces
      'flatTernaryExpressions': true, // ternary should be performed in flat
      'MemberExpression': 0 // member chain should be performed in flat
    } ], // it forces 2 spaces indentation
    'linebreak-style': [ 'error', 'unix' ], // fuck you, CRLF
    'quotes': [ 'error', 'single' ], // quotes must be single
    'eqeqeq': [ 'error', 'smart' ], // fuck you, `==`
    'max-len': [ 'error', { // don't be too long, code
      'code': 100,
      'ignoreComments': true, // comments are okay
      'ignoreStrings': true, // strings are okay
      'ignoreTemplateLiterals': true, // templates are also okay
      'ignoreRegExpLiterals': true, // regexs are also okay too
    } ],
    'sort-imports': [ 'error' ], // imports have to be ordered
    'eol-last': [ 'error', 'always' ], // eof newline is cool

    // variables
    '@typescript-eslint/no-unused-vars': [ 'warn' ], // draw yellow line under unused vars
    'no-undef': [ 'warn' ], // draws yellow line under undefined vars
    'no-var': [ 'error' ], // fuck you, var
    'prefer-const': [ 'error' ], // const is better than let

    // omittables
    'semi': [ 'error', 'always' ], // semicolon is required
    'curly': [ 'error' ], // it kills `if (foo) bar++;`
    'arrow-parens': [ 'error', 'always' ], // it kills `arg => { func(); }`

    // force spacing (I prefer super sparse code!)
    'array-bracket-spacing': [ 'error', 'always' ], // it kills `[val1, val2]`
    'arrow-spacing': [ 'error', { 'before': true, 'after': true } ], // it kills `( arg )=>{ func(); }`
    'block-spacing': [ 'error', 'always' ], // it kills `if ( cond ) {func();}`
    'comma-spacing': [ 'error', { 'before': false, 'after': true } ], // it kills `func( arg1,arg2 )`
    'computed-property-spacing': [ 'error', 'always' ], // it kills `arr[i]`
    'key-spacing': [ 'error', { 'beforeColon': false, 'afterColon': true } ], // it kills `{ key:val }`
    'keyword-spacing': [ 'error', { 'before': true, 'after': true } ], // it kills `}else{`
    'object-curly-spacing': [ 'error', 'always' ], // it kills `{key: val}`
    'semi-spacing': [ 'error', { 'before': false, 'after': true } ], // it kills `func1();func2();`
    'space-before-blocks': [ 'error', 'always' ], // it kills `if (cond){`
    'space-in-parens': [ 'error', 'always' ], // it kills `func (arg)`
    'space-infix-ops': [ 'error' ], // it kills val1+val2
    'space-unary-ops': [ 'error', { 'words': true, 'nonwords': false, 'overrides': { '++': true, '--': true } } ], // it kills `val++`
    'spaced-comment': [ 'error', 'always', { 'markers': [ '/', '!' ] } ], // it kills `//this is comment`

    // ban spacing
    'func-call-spacing': [ 'error', 'never' ], // no-trailing-spaces. yea.
    'no-trailing-spaces': [ 'error' ], // no-trailing-spaces. yea.
    'no-whitespace-before-property': [ 'error' ], // it kills `obj .key`
    'space-before-function-paren': [ 'error', { 'anonymous': 'never', 'named': 'never', 'asyncArrow': 'always' } ], // it kills `func ()`

    // others
    'no-eval': [ 'warn' ], // nope
    'no-implied-eval': [ 'warn' ], // ok don't
    'no-console': [ 'error', { allow: [ 'info', 'warn', 'error' ] } ], // don't forget to remove `console.log` !

    // typescript-specifics
    '@typescript-eslint/no-explicit-any': [ 'off' ], // yea
    '@typescript-eslint/explicit-member-accessibility': [ 'error' ], // `public` / `private` for members and methods are required
    '@typescript-eslint/no-non-null-assertion': [ 'off' ], // bang is sometimes required
    '@typescript-eslint/no-empty-interface': [ 'error', { 'allowSingleExtends': true } ], // bans interface Foo {}
  }
};