Справочник форматтеров
ESLint включает несколько встроенных форматтеров, позволяющих управлять отображением результатов проверки, а также поддерживает сторонние форматтеры.
Указать форматтер можно с помощью флага --format или -f в CLI. Например, --format json использует форматтер json.
Доступны следующие встроенные форматтеры:
Пример исходного кода
Примеры для каждого форматтера созданы на основе проверки fullOfProblems.js с использованием конфигурации eslint.config.js, показанной ниже.
fullOfProblems.js:
function addOne(i) {
if (i != NaN) {
return i ++
} else {
return
}
};
eslint.config.js:
import { defineConfig } from "eslint/config";
import js from "@eslint/js";
export default defineConfig([
{
files: ["**/*.js"],
plugins: {
js,
},
extends: ["js/recommended"],
rules: {
"consistent-return": 2,
"indent" : [1, 4],
"no-else-return" : 1,
"semi" : [1, "always"],
"space-unary-ops" : 2
}
}
]);
Проверка форматтеров с помощью CLI:
npx eslint --format <Add formatter here> fullOfProblems.js
Встроенные форматтеры
html
Выводит результаты в формате HTML. Форматтер html удобен для наглядного отображения в браузере.
Пример вывода:
json-with-metadata
Выводит результаты в формате JSON. Форматтер json-with-metadata предоставляет те же результаты проверки, что и форматтер json, а также дополнительные метаданные о применённых правилах. Результаты проверки включены в свойство results, а метаданные правил — в свойство metadata.
Также для программного использования ESLint можно воспользоваться API ESLint для Node.js.
Пример вывода (для удобства чтения отформатирован):
{
"results": [
{
"filePath": "/var/lib/jenkins/workspace/eslint Release/eslint/fullOfProblems.js",
"messages": [
{
"ruleId": "no-unused-vars",
"severity": 2,
"message": "'addOne' is defined but never used.",
"line": 1,
"column": 10,
"messageId": "unusedVar",
"endLine": 1,
"endColumn": 16,
"suggestions": [
{
"messageId": "removeVar",
"data": {
"varName": "addOne"
},
"fix": {
"range": [
0,
94
],
"text": ""
},
"desc": "Remove unused variable 'addOne'."
}
]
},
{
"ruleId": "use-isnan",
"severity": 2,
"message": "Use the isNaN function to compare with NaN.",
"line": 2,
"column": 9,
"messageId": "comparisonWithNaN",
"endLine": 2,
"endColumn": 17,
"suggestions": [
{
"messageId": "replaceWithIsNaN",
"fix": {
"range": [
29,
37
],
"text": "!Number.isNaN(i)"
},
"desc": "Replace with Number.isNaN."
},
{
"messageId": "replaceWithCastingAndIsNaN",
"fix": {
"range": [
29,
37
],
"text": "!Number.isNaN(Number(i))"
},
"desc": "Replace with Number.isNaN and cast to a Number."
}
]
},
{
"ruleId": "space-unary-ops",
"severity": 2,
"message": "Unexpected space before unary operator '++'.",
"line": 3,
"column": 16,
"messageId": "unexpectedBefore",
"endLine": 3,
"endColumn": 20,
"fix": {
"range": [
57,
58
],
"text": ""
}
},
{
"ruleId": "no-useless-assignment",
"severity": 2,
"message": "The value assigned to 'i' is not used in subsequent statements.",
"line": 3,
"column": 16,
"messageId": "unnecessaryAssignment",
"endLine": 3,
"endColumn": 17
},
{
"ruleId": "semi",
"severity": 1,
"message": "Missing semicolon.",
"line": 3,
"column": 20,
"messageId": "missingSemi",
"endLine": 4,
"endColumn": 1,
"fix": {
"range": [
60,
60
],
"text": ";"
}
},
{
"ruleId": "no-else-return",
"severity": 1,
"message": "Unnecessary 'else' after 'return'.",
"line": 4,
"column": 12,
"messageId": "unexpected",
"endLine": 6,
"endColumn": 6,
"fix": {
"range": [
0,
94
],
"text": "function addOne(i) {\n if (i != NaN) {\n return i ++\n } \n return\n \n}"
}
},
{
"ruleId": "indent",
"severity": 1,
"message": "Expected indentation of 8 spaces but found 6.",
"line": 5,
"column": 1,
"messageId": "wrongIndentation",
"endLine": 5,
"endColumn": 7,
"fix": {
"range": [
74,
80
],
"text": " "
}
},
{
"ruleId": "consistent-return",
"severity": 2,
"message": "Function 'addOne' expected a return value.",
"line": 5,
"column": 7,
"messageId": "missingReturnValue",
"endLine": 5,
"endColumn": 13
},
{
"ruleId": "semi",
"severity": 1,
"message": "Missing semicolon.",
"line": 5,
"column": 13,
"messageId": "missingSemi",
"endLine": 6,
"endColumn": 1,
"fix": {
"range": [
86,
86
],
"text": ";"
}
}
],
"suppressedMessages": [],
"errorCount": 5,
"fatalErrorCount": 0,
"warningCount": 4,
"fixableErrorCount": 1,
"fixableWarningCount": 4,
"source": "function addOne(i) {\n if (i != NaN) {\n return i ++\n } else {\n return\n }\n};",
"usedDeprecatedRules": [
{
"ruleId": "indent",
"replacedBy": [
"@stylistic/indent"
],
"info": {
"message": "Formatting rules are being moved out of ESLint core.",
"url": "https://eslint.org/blog/2023/10/deprecating-formatting-rules/",
"deprecatedSince": "8.53.0",
"availableUntil": "11.0.0",
"replacedBy": [
{
"message": "ESLint Stylistic now maintains deprecated stylistic core rules.",
"url": "https://eslint.style/guide/migration",
"plugin": {
"name": "@stylistic/eslint-plugin",
"url": "https://eslint.style"
},
"rule": {
"name": "indent",
"url": "https://eslint.style/rules/indent"
}
}
]
}
},
{
"ruleId": "semi",
"replacedBy": [
"@stylistic/semi"
],
"info": {
"message": "Formatting rules are being moved out of ESLint core.",
"url": "https://eslint.org/blog/2023/10/deprecating-formatting-rules/",
"deprecatedSince": "8.53.0",
"availableUntil": "11.0.0",
"replacedBy": [
{
"message": "ESLint Stylistic now maintains deprecated stylistic core rules.",
"url": "https://eslint.style/guide/migration",
"plugin": {
"name": "@stylistic/eslint-plugin",
"url": "https://eslint.style"
},
"rule": {
"name": "semi",
"url": "https://eslint.style/rules/semi"
}
}
]
}
},
{
"ruleId": "space-unary-ops",
"replacedBy": [
"@stylistic/space-unary-ops"
],
"info": {
"message": "Formatting rules are being moved out of ESLint core.",
"url": "https://eslint.org/blog/2023/10/deprecating-formatting-rules/",
"deprecatedSince": "8.53.0",
"availableUntil": "11.0.0",
"replacedBy": [
{
"message": "ESLint Stylistic now maintains deprecated stylistic core rules.",
"url": "https://eslint.style/guide/migration",
"plugin": {
"name": "@stylistic/eslint-plugin",
"url": "https://eslint.style"
},
"rule": {
"name": "space-unary-ops",
"url": "https://eslint.style/rules/space-unary-ops"
}
}
]
}
}
]
}
],
"metadata": {
"cwd": "/var/lib/jenkins/workspace/eslint Release/eslint",
"rulesMeta": {
"no-unused-vars": {
"type": "problem",
"docs": {
"description": "Disallow unused variables",
"recommended": true,
"url": "https://eslint.org/docs/latest/rules/no-unused-vars"
},
"hasSuggestions": true,
"schema": [
{
"oneOf": [
{
"enum": [
"all",
"local"
]
},
{
"type": "object",
"properties": {
"vars": {
"enum": [
"all",
"local"
]
},
"varsIgnorePattern": {
"type": "string"
},
"args": {
"enum": [
"all",
"after-used",
"none"
]
},
"ignoreRestSiblings": {
"type": "boolean"
},
"argsIgnorePattern": {
"type": "string"
},
"caughtErrors": {
"enum": [
"all",
"none"
]
},
"caughtErrorsIgnorePattern": {
"type": "string"
},
"destructuredArrayIgnorePattern": {
"type": "string"
},
"ignoreClassWithStaticInitBlock": {
"type": "boolean"
},
"ignoreUsingDeclarations": {
"type": "boolean"
},
"reportUsedIgnorePattern": {
"type": "boolean"
}
},
"additionalProperties": false
}
]
}
],
"defaultOptions": [
{
"vars": "all",
"args": "after-used",
"ignoreRestSiblings": false,
"caughtErrors": "all",
"ignoreClassWithStaticInitBlock": false,
"ignoreUsingDeclarations": false,
"reportUsedIgnorePattern": false
}
],
"messages": {
"unusedVar": "'' is but never used.",
"usedIgnoredVar": "'' is marked as ignored but is used.",
"removeVar": "Remove unused variable ''."
}
},
"use-isnan": {
"hasSuggestions": true,
"type": "problem",
"docs": {
"description": "Require calls to `isNaN()` when checking for `NaN`",
"recommended": true,
"url": "https://eslint.org/docs/latest/rules/use-isnan"
},
"schema": [
{
"type": "object",
"properties": {
"enforceForSwitchCase": {
"type": "boolean"
},
"enforceForIndexOf": {
"type": "boolean"
}
},
"additionalProperties": false
}
],
"defaultOptions": [
{
"enforceForIndexOf": false,
"enforceForSwitchCase": true
}
],
"messages": {
"comparisonWithNaN": "Use the isNaN function to compare with NaN.",
"switchNaN": "'switch(NaN)' can never match a case clause. Use Number.isNaN instead of the switch.",
"caseNaN": "'case NaN' can never match. Use Number.isNaN before the switch.",
"indexOfNaN": "Array prototype method '' cannot find NaN.",
"replaceWithIsNaN": "Replace with Number.isNaN.",
"replaceWithCastingAndIsNaN": "Replace with Number.isNaN and cast to a Number.",
"replaceWithFindIndex": "Replace with Array.prototype.."
}
},
"space-unary-ops": {
"deprecated": {
"message": "Formatting rules are being moved out of ESLint core.",
"url": "https://eslint.org/blog/2023/10/deprecating-formatting-rules/",
"deprecatedSince": "8.53.0",
"availableUntil": "11.0.0",
"replacedBy": [
{
"message": "ESLint Stylistic now maintains deprecated stylistic core rules.",
"url": "https://eslint.style/guide/migration",
"plugin": {
"name": "@stylistic/eslint-plugin",
"url": "https://eslint.style"
},
"rule": {
"name": "space-unary-ops",
"url": "https://eslint.style/rules/space-unary-ops"
}
}
]
},
"type": "layout",
"docs": {
"description": "Enforce consistent spacing before or after unary operators",
"recommended": false,
"url": "https://eslint.org/docs/latest/rules/space-unary-ops"
},
"fixable": "whitespace",
"schema": [
{
"type": "object",
"properties": {
"words": {
"type": "boolean",
"default": true
},
"nonwords": {
"type": "boolean",
"default": false
},
"overrides": {
"type": "object",
"additionalProperties": {
"type": "boolean"
}
}
},
"additionalProperties": false
}
],
"messages": {
"unexpectedBefore": "Unexpected space before unary operator ''.",
"unexpectedAfter": "Unexpected space after unary operator ''.",
"unexpectedAfterWord": "Unexpected space after unary word operator ''.",
"wordOperator": "Unary word operator '' must be followed by whitespace.",
"operator": "Unary operator '' must be followed by whitespace.",
"beforeUnaryExpressions": "Space is required before unary expressions ''."
}
},
"no-useless-assignment": {
"type": "problem",
"docs": {
"description": "Disallow variable assignments when the value is not used",
"recommended": true,
"url": "https://eslint.org/docs/latest/rules/no-useless-assignment"
},
"schema": [],
"messages": {
"unnecessaryAssignment": "The value assigned to '' is not used in subsequent statements."
}
},
"semi": {
"deprecated": {
"message": "Formatting rules are being moved out of ESLint core.",
"url": "https://eslint.org/blog/2023/10/deprecating-formatting-rules/",
"deprecatedSince": "8.53.0",
"availableUntil": "11.0.0",
"replacedBy": [
{
"message": "ESLint Stylistic now maintains deprecated stylistic core rules.",
"url": "https://eslint.style/guide/migration",
"plugin": {
"name": "@stylistic/eslint-plugin",
"url": "https://eslint.style"
},
"rule": {
"name": "semi",
"url": "https://eslint.style/rules/semi"
}
}
]
},
"type": "layout",
"docs": {
"description": "Require or disallow semicolons instead of ASI",
"recommended": false,
"url": "https://eslint.org/docs/latest/rules/semi"
},
"fixable": "code",
"schema": {
"anyOf": [
{
"type": "array",
"items": [
{
"enum": [
"never"
]
},
{
"type": "object",
"properties": {
"beforeStatementContinuationChars": {
"enum": [
"always",
"any",
"never"
]
}
},
"additionalProperties": false
}
],
"minItems": 0,
"maxItems": 2
},
{
"type": "array",
"items": [
{
"enum": [
"always"
]
},
{
"type": "object",
"properties": {
"omitLastInOneLineBlock": {
"type": "boolean"
},
"omitLastInOneLineClassBody": {
"type": "boolean"
}
},
"additionalProperties": false
}
],
"minItems": 0,
"maxItems": 2
}
]
},
"messages": {
"missingSemi": "Missing semicolon.",
"extraSemi": "Extra semicolon."
}
},
"no-else-return": {
"type": "suggestion",
"defaultOptions": [
{
"allowElseIf": true
}
],
"docs": {
"description": "Disallow `else` blocks after `return` statements in `if` statements",
"recommended": false,
"frozen": true,
"url": "https://eslint.org/docs/latest/rules/no-else-return"
},
"schema": [
{
"type": "object",
"properties": {
"allowElseIf": {
"type": "boolean"
}
},
"additionalProperties": false
}
],
"fixable": "code",
"messages": {
"unexpected": "Unnecessary 'else' after 'return'."
}
},
"indent": {
"deprecated": {
"message": "Formatting rules are being moved out of ESLint core.",
"url": "https://eslint.org/blog/2023/10/deprecating-formatting-rules/",
"deprecatedSince": "8.53.0",
"availableUntil": "11.0.0",
"replacedBy": [
{
"message": "ESLint Stylistic now maintains deprecated stylistic core rules.",
"url": "https://eslint.style/guide/migration",
"plugin": {
"name": "@stylistic/eslint-plugin",
"url": "https://eslint.style"
},
"rule": {
"name": "indent",
"url": "https://eslint.style/rules/indent"
}
}
]
},
"type": "layout",
"docs": {
"description": "Enforce consistent indentation",
"recommended": false,
"url": "https://eslint.org/docs/latest/rules/indent"
},
"fixable": "whitespace",
"schema": [
{
"oneOf": [
{
"enum": [
"tab"
]
},
{
"type": "integer",
"minimum": 0
}
]
},
{
"type": "object",
"properties": {
"SwitchCase": {
"type": "integer",
"minimum": 0,
"default": 0
},
"VariableDeclarator": {
"oneOf": [
{
"oneOf": [
{
"type": "integer",
"minimum": 0
},
{
"enum": [
"first",
"off"
]
}
]
},
{
"type": "object",
"properties": {
"var": {
"oneOf": [
{
"type": "integer",
"minimum": 0
},
{
"enum": [
"first",
"off"
]
}
]
},
"let": {
"oneOf": [
{
"type": "integer",
"minimum": 0
},
{
"enum": [
"first",
"off"
]
}
]
},
"const": {
"oneOf": [
{
"type": "integer",
"minimum": 0
},
{
"enum": [
"first",
"off"
]
}
]
}
},
"additionalProperties": false
}
]
},
"outerIIFEBody": {
"oneOf": [
{
"type": "integer",
"minimum": 0
},
{
"enum": [
"off"
]
}
]
},
"MemberExpression": {
"oneOf": [
{
"type": "integer",
"minimum": 0
},
{
"enum": [
"off"
]
}
]
},
"FunctionDeclaration": {
"type": "object",
"properties": {
"parameters": {
"oneOf": [
{
"type": "integer",
"minimum": 0
},
{
"enum": [
"first",
"off"
]
}
]
},
"body": {
"type": "integer",
"minimum": 0
}
},
"additionalProperties": false
},
"FunctionExpression": {
"type": "object",
"properties": {
"parameters": {
"oneOf": [
{
"type": "integer",
"minimum": 0
},
{
"enum": [
"first",
"off"
]
}
]
},
"body": {
"type": "integer",
"minimum": 0
}
},
"additionalProperties": false
},
"StaticBlock": {
"type": "object",
"properties": {
"body": {
"type": "integer",
"minimum": 0
}
},
"additionalProperties": false
},
"CallExpression": {
"type": "object",
"properties": {
"arguments": {
"oneOf": [
{
"type": "integer",
"minimum": 0
},
{
"enum": [
"first",
"off"
]
}
]
}
},
"additionalProperties": false
},
"ArrayExpression": {
"oneOf": [
{
"type": "integer",
"minimum": 0
},
{
"enum": [
"first",
"off"
]
}
]
},
"ObjectExpression": {
"oneOf": [
{
"type": "integer",
"minimum": 0
},
{
"enum": [
"first",
"off"
]
}
]
},
"ImportDeclaration": {
"oneOf": [
{
"type": "integer",
"minimum": 0
},
{
"enum": [
"first",
"off"
]
}
]
},
"flatTernaryExpressions": {
"type": "boolean",
"default": false
},
"offsetTernaryExpressions": {
"type": "boolean",
"default": false
},
"ignoredNodes": {
"type": "array",
"items": {
"type": "string",
"not": {
"pattern": ":exit$"
}
}
},
"ignoreComments": {
"type": "boolean",
"default": false
}
},
"additionalProperties": false
}
],
"messages": {
"wrongIndentation": "Expected indentation of but found ."
}
},
"consistent-return": {
"type": "suggestion",
"docs": {
"description": "Require `return` statements to either always or never specify values",
"recommended": false,
"url": "https://eslint.org/docs/latest/rules/consistent-return"
},
"schema": [
{
"type": "object",
"properties": {
"treatUndefinedAsUnspecified": {
"type": "boolean"
}
},
"additionalProperties": false
}
],
"defaultOptions": [
{
"treatUndefinedAsUnspecified": false
}
],
"messages": {
"missingReturn": "Expected to return a value at the end of .",
"missingReturnValue": " expected a return value.",
"unexpectedReturnValue": " expected no return value."
}
}
}
}
}
json
Выводит результаты в формате JSON. Форматтер json удобен, если вы хотите программно обрабатывать результаты проверки, полученные с помощью CLI.
Также для программного использования ESLint можно воспользоваться API ESLint для Node.js.
Пример вывода (для удобства чтения отформатирован):
[
{
"filePath": "/var/lib/jenkins/workspace/eslint Release/eslint/fullOfProblems.js",
"messages": [
{
"ruleId": "no-unused-vars",
"severity": 2,
"message": "'addOne' is defined but never used.",
"line": 1,
"column": 10,
"messageId": "unusedVar",
"endLine": 1,
"endColumn": 16,
"suggestions": [
{
"messageId": "removeVar",
"data": {
"varName": "addOne"
},
"fix": {
"range": [
0,
94
],
"text": ""
},
"desc": "Remove unused variable 'addOne'."
}
]
},
{
"ruleId": "use-isnan",
"severity": 2,
"message": "Use the isNaN function to compare with NaN.",
"line": 2,
"column": 9,
"messageId": "comparisonWithNaN",
"endLine": 2,
"endColumn": 17,
"suggestions": [
{
"messageId": "replaceWithIsNaN",
"fix": {
"range": [
29,
37
],
"text": "!Number.isNaN(i)"
},
"desc": "Replace with Number.isNaN."
},
{
"messageId": "replaceWithCastingAndIsNaN",
"fix": {
"range": [
29,
37
],
"text": "!Number.isNaN(Number(i))"
},
"desc": "Replace with Number.isNaN and cast to a Number."
}
]
},
{
"ruleId": "space-unary-ops",
"severity": 2,
"message": "Unexpected space before unary operator '++'.",
"line": 3,
"column": 16,
"messageId": "unexpectedBefore",
"endLine": 3,
"endColumn": 20,
"fix": {
"range": [
57,
58
],
"text": ""
}
},
{
"ruleId": "no-useless-assignment",
"severity": 2,
"message": "The value assigned to 'i' is not used in subsequent statements.",
"line": 3,
"column": 16,
"messageId": "unnecessaryAssignment",
"endLine": 3,
"endColumn": 17
},
{
"ruleId": "semi",
"severity": 1,
"message": "Missing semicolon.",
"line": 3,
"column": 20,
"messageId": "missingSemi",
"endLine": 4,
"endColumn": 1,
"fix": {
"range": [
60,
60
],
"text": ";"
}
},
{
"ruleId": "no-else-return",
"severity": 1,
"message": "Unnecessary 'else' after 'return'.",
"line": 4,
"column": 12,
"messageId": "unexpected",
"endLine": 6,
"endColumn": 6,
"fix": {
"range": [
0,
94
],
"text": "function addOne(i) {\n if (i != NaN) {\n return i ++\n } \n return\n \n}"
}
},
{
"ruleId": "indent",
"severity": 1,
"message": "Expected indentation of 8 spaces but found 6.",
"line": 5,
"column": 1,
"messageId": "wrongIndentation",
"endLine": 5,
"endColumn": 7,
"fix": {
"range": [
74,
80
],
"text": " "
}
},
{
"ruleId": "consistent-return",
"severity": 2,
"message": "Function 'addOne' expected a return value.",
"line": 5,
"column": 7,
"messageId": "missingReturnValue",
"endLine": 5,
"endColumn": 13
},
{
"ruleId": "semi",
"severity": 1,
"message": "Missing semicolon.",
"line": 5,
"column": 13,
"messageId": "missingSemi",
"endLine": 6,
"endColumn": 1,
"fix": {
"range": [
86,
86
],
"text": ";"
}
}
],
"suppressedMessages": [],
"errorCount": 5,
"fatalErrorCount": 0,
"warningCount": 4,
"fixableErrorCount": 1,
"fixableWarningCount": 4,
"source": "function addOne(i) {\n if (i != NaN) {\n return i ++\n } else {\n return\n }\n};",
"usedDeprecatedRules": [
{
"ruleId": "indent",
"replacedBy": [
"@stylistic/indent"
],
"info": {
"message": "Formatting rules are being moved out of ESLint core.",
"url": "https://eslint.org/blog/2023/10/deprecating-formatting-rules/",
"deprecatedSince": "8.53.0",
"availableUntil": "11.0.0",
"replacedBy": [
{
"message": "ESLint Stylistic now maintains deprecated stylistic core rules.",
"url": "https://eslint.style/guide/migration",
"plugin": {
"name": "@stylistic/eslint-plugin",
"url": "https://eslint.style"
},
"rule": {
"name": "indent",
"url": "https://eslint.style/rules/indent"
}
}
]
}
},
{
"ruleId": "semi",
"replacedBy": [
"@stylistic/semi"
],
"info": {
"message": "Formatting rules are being moved out of ESLint core.",
"url": "https://eslint.org/blog/2023/10/deprecating-formatting-rules/",
"deprecatedSince": "8.53.0",
"availableUntil": "11.0.0",
"replacedBy": [
{
"message": "ESLint Stylistic now maintains deprecated stylistic core rules.",
"url": "https://eslint.style/guide/migration",
"plugin": {
"name": "@stylistic/eslint-plugin",
"url": "https://eslint.style"
},
"rule": {
"name": "semi",
"url": "https://eslint.style/rules/semi"
}
}
]
}
},
{
"ruleId": "space-unary-ops",
"replacedBy": [
"@stylistic/space-unary-ops"
],
"info": {
"message": "Formatting rules are being moved out of ESLint core.",
"url": "https://eslint.org/blog/2023/10/deprecating-formatting-rules/",
"deprecatedSince": "8.53.0",
"availableUntil": "11.0.0",
"replacedBy": [
{
"message": "ESLint Stylistic now maintains deprecated stylistic core rules.",
"url": "https://eslint.style/guide/migration",
"plugin": {
"name": "@stylistic/eslint-plugin",
"url": "https://eslint.style"
},
"rule": {
"name": "space-unary-ops",
"url": "https://eslint.style/rules/space-unary-ops"
}
}
]
}
}
]
}
]
stylish
Формат вывода, удобный для чтения. Используется по умолчанию.
Пример вывода:
/var/lib/jenkins/workspace/eslint Release/eslint/fullOfProblems.js
1:10 error 'addOne' is defined but never used no-unused-vars
2:9 error Use the isNaN function to compare with NaN use-isnan
3:16 error Unexpected space before unary operator '++' space-unary-ops
3:16 error The value assigned to 'i' is not used in subsequent statements no-useless-assignment
3:20 warning Missing semicolon semi
4:12 warning Unnecessary 'else' after 'return' no-else-return
5:1 warning Expected indentation of 8 spaces but found 6 indent
5:7 error Function 'addOne' expected a return value consistent-return
5:13 warning Missing semicolon semi
✖ 9 problems (5 errors, 4 warnings)
1 error and 4 warnings potentially fixable with the `--fix` option.
© OpenJS Foundation and other contributors
Licensed under the MIT License.
https://eslint.org/docs/latest/use/formatters
