.eslintrc.json

{
  "env": {
    "es2021": true,
    "node": true
  },
  "extends": [ "eslint:recommended" ],
  "plugins": [ "@typescript-eslint" ],
  "parser": "@typescript-eslint/parser",
  "parserOptions": {
    "ecmaVersion": 12,
    "sourceType": "module",
    "jsxPragma": "h",
    "jsxFragmentName": "Fragment"
  },
  "rules": {
    "no-process-exit": "off",
    "no-undef": "off",
    "no-unused-vars": "off",
    "no-redeclare": "off",
    "@typescript-eslint/no-unused-vars": [ "error", { "argsIgnorePattern": "^_" } ],
    "@typescript-eslint/no-redeclare": "error",

    // Possible errors
    "no-loss-of-precision": "error",
    "@typescript-eslint/no-extra-parens": [
      "error", "all",
      {
        "conditionalAssign": false,
        "returnAssign": false,
        "nestedBinaryExpressions": false,
        "ignoreJSX": "multi-line"
      }
    ],
    "no-template-curly-in-string": "error",
    "no-sparse-arrays": "error",
    "no-unreachable-loop": "error",
    "no-useless-backreference": "error",
    "require-atomic-updates": "error",

    // Best practices
    "class-methods-use-this": "error",
    "default-case-last": "error",
    "default-param-last": "error",
    "dot-location": [ "error", "property" ],
    "dot-notation": "error",
    "eqeqeq": "error",
    "grouped-accessor-pairs": [ "error", "getBeforeSet" ],
    "guard-for-in": "error",
    "no-alert": "error",
    "no-caller": "error",
    "no-constructor-return": "error",
    "no-else-return": "error",
    "@typescript-eslint/no-empty-function": "error",
    "no-eval": "error",
    "no-extend-native": "error",
    "no-extra-bind": "error",
    "no-floating-decimal": "error",
    "no-implicit-coercion": "error",
    "no-implied-eval": "error",
    "@typescript-eslint/no-invalid-this": "error",
    "no-iterator": "error",
    "no-labels": "error",
    "no-lone-blocks": "error",
    "no-loop-func": "error",
    "no-multi-spaces": "error",
    "no-new": "error",
    "no-new-wrappers": "error",
    "no-octal": "error",
    "no-octal-escape": "error",
    "no-proto": "error",
    "no-return-assign": [ "error", "except-parens" ],
    "no-return-await": "error",
    "no-self-compare": "error",
    "no-sequences": "error",
    "no-throw-literal": "error",
    "no-unmodified-loop-condition": "error",
    "no-unused-expressions": "error",
    "no-warning-comments": "warn",
    "prefer-promise-reject-errors": "error",
    "radix": "error",
    "wrap-iife": "error",
    "yoda": "error",

    // Vars
    "@typescript-eslint/no-shadow": "error",
    "no-undefined": "error",
    "@typescript-eslint/no-use-before-define": "error",

    // Stylistic
    "array-bracket-newline": [ "error", "consistent" ],
    "array-bracket-spacing": [ "error", "always" ],
    "block-spacing": "error",
    "brace-style": [ "error", "1tbs", { "allowSingleLine": true } ],
    // "camelcase": "error",
    "comma-dangle": [
      "error",
       {
        "arrays": "always-multiline",
        "objects": "always-multiline",
        "imports": "always-multiline",
        "exports": "always-multiline",
        "functions": "never"
       }
    ],
    "comma-spacing": "error",
    "comma-style": "error",
    "computed-property-spacing": "error",
    "eol-last": "error",
    "func-call-spacing": "error",
    "func-name-matching": "error",
    "function-call-argument-newline": [ "error", "consistent" ],
    "function-paren-newline": [ "error", "multiline-arguments" ],
    "indent": [ "error", 2, { "SwitchCase": 1 } ],
    "jsx-quotes": [ "error", "prefer-single" ],
    "key-spacing": "error",
    "keyword-spacing": "error",
    "linebreak-style": [ "error", "unix" ],
    "lines-between-class-members": "error",
    "multiline-ternary": [ "error", "always-multiline" ],
    "new-cap": [ "error", { "properties": false, "capIsNewExceptionPattern": "^[A-Z_]+$" } ],
    "new-parens": "error",
    "no-array-constructor": "error",
    "no-lonely-if": "error",
    "no-mixed-operators": "error",
    "no-multi-assign": "error",
    "no-multiple-empty-lines": "error",
    "no-new-object": "error",
    "no-tabs": "error",
    "no-trailing-spaces": "error",
    "no-unneeded-ternary": "error",
    "no-whitespace-before-property": "error",
    "nonblock-statement-body-position": "error",
    "object-curly-newline": [ "error" ],
    "object-curly-spacing": [ "error", "always" ],
    "object-property-newline": [ "error", { "allowAllPropertiesOnSameLine": true } ],
    "one-var": [ "error", "never" ],
    "operator-assignment": "error",
    "operator-linebreak": [ "error", "before" ],
    "padded-blocks": [ "error", "never" ],
    "prefer-exponentiation-operator": "error",
    "quotes": [ "error", "single" ],
    "semi": [ "error", "never" ],
    "semi-style": [ "error", "first" ],
    "space-before-blocks": "error",
    "space-before-function-paren": "error",
    "space-in-parens": "error",
    "space-infix-ops": "error",
    "space-unary-ops": [ "error", { "words": true, "nonwords": false } ],
    "switch-colon-spacing": "error",
    "template-tag-spacing": "error",
    "unicode-bom": "error",

    // ES6
    "arrow-body-style": "error",
    "arrow-parens": "error",
    "arrow-spacing": "error",
    "generator-star-spacing": [
      "error",
      {
        "named": "after",
        "anonymous": "after",
        "method": "before"
      }
    ],
    "no-useless-computed-key": "error",
    "@typescript-eslint/no-useless-constructor": "error",
    "no-useless-rename": "error",
    "no-var": "error",
    "object-shorthand": [ "error", "never" ],
    "prefer-arrow-callback": "error",
    "prefer-rest-params": "error",
    "prefer-template": "error",
    "rest-spread-spacing": "error",
    "symbol-description": "error",
    "template-curly-spacing": "error",
    "yield-star-spacing": [ "error", "after" ]
  }
}