.eslintrc.json

{
    "parserOptions": {
        "ecmaVersion": 11,
        "sourceType": "module"
    },
    "rules": {
        "no-var": "warn",

        "accessor-pairs": ["warn", { "setWithoutGet": true, "enforceForClassMembers": true }],
        "array-bracket-spacing": ["warn", "never"],
        "array-callback-return": ["warn", {
          "allowImplicit": false,
          "checkForEach": false
        }],
        "arrow-spacing": ["warn", { "before": true, "after": true }],
        "block-spacing": ["warn", "always"],
        "brace-style": ["warn", "1tbs", { "allowSingleLine": true }],
        "camelcase": ["warn", {
          "allow": ["^UNSAFE_"],
          "properties": "never",
          "ignoreGlobals": true
        }],
        "comma-dangle": ["warn", {
          "arrays": "never",
          "objects": "never",
          "imports": "never",
          "exports": "never",
          "functions": "never"
        }],
        "comma-spacing": ["warn", { "before": false, "after": true }],
        "comma-style": ["warn", "last"],
        "computed-property-spacing": ["warn", "never", { "enforceForClassMembers": true }],
        "constructor-super": "warn",
        "curly": ["warn", "multi-line"],
        "default-case-last": "warn",
        "dot-location": ["warn", "property"],
        "dot-notation": ["warn", { "allowKeywords": true }],
        "eol-last": "warn",
        "eqeqeq": ["warn", "always", { "null": "ignore" }],
        "func-call-spacing": ["warn", "never"],
        "generator-star-spacing": ["warn", { "before": true, "after": true }],
        "indent": ["warn", 4, {
          "SwitchCase": 1,
          "VariableDeclarator": 1,
          "outerIIFEBody": 1,
          "MemberExpression": 1,
          "FunctionDeclaration": { "parameters": 1, "body": 1 },
          "FunctionExpression": { "parameters": 1, "body": 1 },
          "CallExpression": { "arguments": 1 },
          "ArrayExpression": 1,
          "ObjectExpression": 1,
          "ImportDeclaration": 1,
          "flatTernaryExpressions": false,
          "ignoreComments": false,
          "ignoredNodes": ["TemplateLiteral *", "JSXElement", "JSXElement > *", "JSXAttribute", "JSXIdentifier", "JSXNamespacedName", "JSXMemberExpression", "JSXSpreadAttribute", "JSXExpressionContainer", "JSXOpeningElement", "JSXClosingElement", "JSXFragment", "JSXOpeningFragment", "JSXClosingFragment", "JSXText", "JSXEmptyExpression", "JSXSpreadChild"],
          "offsetTernaryExpressions": true
        }],
        "key-spacing": ["warn", { "beforeColon": false, "afterColon": true }],
        "keyword-spacing": ["warn", { "before": true, "after": true }],
        "lines-between-class-members": ["warn", "always", { "exceptAfterSingleLine": true }],
        "multiline-ternary": ["warn", "always-multiline"],
        "new-cap": ["warn", { "newIsCap": true, "capIsNew": false, "properties": true }],
        "new-parens": "warn",
        "no-array-constructor": "warn",
        "no-async-promise-executor": "warn",
        "no-caller": "warn",
        "no-case-declarations": "warn",
        "no-class-assign": "warn",
        "no-compare-neg-zero": "warn",
        "no-cond-assign": "warn",
        "no-const-assign": "warn",
        "no-constant-condition": ["warn", { "checkLoops": false }],
        "no-control-regex": "warn",
        "no-debugger": "warn",
        "no-delete-var": "warn",
        "no-dupe-args": "warn",
        "no-dupe-class-members": "warn",
        "no-dupe-keys": "warn",
        "no-duplicate-case": "warn",
        "no-useless-backreference": "warn",
        "no-empty": ["warn", { "allowEmptyCatch": true }],
        "no-empty-character-class": "warn",
        "no-empty-pattern": "warn",
        "no-eval": "warn",
        "no-ex-assign": "warn",
        "no-extend-native": "warn",
        "no-extra-bind": "warn",
        "no-extra-boolean-cast": "warn",
        "no-extra-parens": ["warn", "functions"],
        "no-fallthrough": "warn",
        "no-floating-decimal": "warn",
        "no-func-assign": "warn",
        "no-global-assign": "warn",
        "no-implied-eval": "warn",
        "no-import-assign": "warn",
        "no-invalid-regexp": "warn",
        "no-irregular-whitespace": "warn",
        "no-iterator": "warn",
        "no-labels": ["warn", { "allowLoop": false, "allowSwitch": false }],
        "no-lone-blocks": "warn",
        "no-loss-of-precision": "warn",
        "no-misleading-character-class": "warn",
        "no-prototype-builtins": "warn",
        "no-useless-catch": "warn",
        "no-mixed-operators": ["warn", {
          "groups": [
            ["==", "!=", "===", "!==", ">", ">=", "<", "<="],
            ["&&", "||"],
            ["in", "instanceof"]
          ],
          "allowSamePrecedence": true
        }],
        "no-mixed-spaces-and-tabs": "warn",
        "no-multi-spaces": "warn",
        "no-multi-str": "warn",
        "no-multiple-empty-lines": ["warn", { "max": 1, "maxEOF": 0 }],
        "no-new": "warn",
        "no-new-object": "warn",
        "no-new-symbol": "warn",
        "no-new-wrappers": "warn",
        "no-obj-calls": "warn",
        "no-octal": "warn",
        "no-octal-escape": "warn",
        "no-proto": "warn",
        "no-redeclare": ["warn", { "builtinGlobals": false }],
        "no-regex-spaces": "warn",
        "no-return-assign": ["warn", "except-parens"],
        "no-self-assign": ["warn", { "props": true }],
        "no-self-compare": "warn",
        "no-sequences": "warn",
        "no-shadow-restricted-names": "warn",
        "no-sparse-arrays": "warn",
        "no-tabs": "warn",
        "no-template-curly-in-string": "warn",
        "no-this-before-super": "warn",
        "no-throw-literal": "warn",
        "no-trailing-spaces": "warn",
        "no-unexpected-multiline": "warn",
        "no-unmodified-loop-condition": "warn",
        "no-unneeded-ternary": ["warn", { "defaultAssignment": false }],
        "no-unreachable": "warn",
        "no-unreachable-loop": "warn",
        "no-unsafe-finally": "warn",
        "no-unsafe-negation": "warn",
        "no-unused-expressions": ["warn", {
          "allowShortCircuit": true,
          "allowTernary": true,
          "allowTaggedTemplates": true
        }],
        "no-unused-vars": ["warn", {
          "args": "none",
          "caughtErrors": "none",
          "ignoreRestSiblings": true,
          "vars": "all"
        }],
        "no-use-before-define": ["warn", { "functions": false, "classes": false, "variables": false }],
        "no-useless-call": "warn",
        "no-useless-computed-key": "warn",
        "no-useless-constructor": "warn",
        "no-useless-escape": "warn",
        "no-useless-rename": "warn",
        "no-useless-return": "warn",
        "no-void": "warn",
        "no-whitespace-before-property": "warn",
        "no-with": "warn",
        "object-curly-newline": ["warn", { "multiline": true, "consistent": true }],
        "object-curly-spacing": ["warn", "always"],
        "object-property-newline": ["warn", { "allowMultiplePropertiesPerLine": true }],
        "one-var": ["warn", { "initialized": "never" }],
        "operator-linebreak": ["warn", "after", { "overrides": { "?": "before", ":": "before", "|>": "before" } }],
        "padded-blocks": ["warn", { "blocks": "never", "switches": "never", "classes": "never" }],
        "prefer-const": ["warn", {"destructuring": "all"}],
        "prefer-promise-reject-errors": "warn",
        "prefer-regex-literals": ["warn", { "disallowRedundantWrapping": true }],
        "quote-props": ["warn", "as-needed"],
        "quotes": ["warn", "single", { "avoidEscape": true, "allowTemplateLiterals": false }],
        "rest-spread-spacing": ["warn", "never"],
        "semi": ["warn", "always"],
        "semi-spacing": ["warn", { "before": false, "after": true }],
        "space-before-blocks": ["warn", "always"],
        "space-before-function-paren": ["warn", "always"],
        "space-in-parens": ["warn", "never"],
        "space-infix-ops": "warn",
        "space-unary-ops": ["warn", { "words": true, "nonwords": false }],
        "spaced-comment": ["warn", "always", {
          "line": { "markers": ["*package", "!", "/", ",", "="] },
          "block": { "balanced": true, "markers": ["*package", "!", ",", ":", "::", "flow-include"], "exceptions": ["*"] }
        }],
        "symbol-description": "warn",
        "template-curly-spacing": ["warn", "never"],
        "template-tag-spacing": ["warn", "never"],
        "unicode-bom": ["warn", "never"],
        "use-isnan": ["warn", {
          "enforceForSwitchCase": true,
          "enforceForIndexOf": true
        }],
        "valid-typeof": ["warn", { "requireStringLiterals": true }],
        "wrap-iife": ["warn", "any", { "functionPrototypeMethods": true }],
        "yield-star-spacing": ["warn", "both"],
        "yoda": ["warn", "never"]
    }
}