Ошибка parsing error unexpected token

With this code:

import React from 'react';
import { Link } from 'react-router';
import { View, NavBar } from 'amazeui-touch';

import * as Pages from '../components';

const {  Home, ...Components } = Pages;

I get this eslint error:

7:16  error  Parsing error: Unexpected token .. Why?

Here is my eslint config:

{
  "extends": "airbnb",
  "rules": {
    /* JSX */
    "react/prop-types": [1, {
      "ignore": ["className", "children", "location", "params", "location*"]
    }],
    "no-param-reassign": [0, {
      "props": false
    }],
    "prefer-rest-params": 1,
    "arrow-body-style": 0,
    "prefer-template": 0,
    "react/prefer-stateless-function": 1,
    "react/jsx-no-bind": [0, {
      "ignoreRefs": false,
      "allowArrowFunctions": false,
      "allowBind": true
    }],
  }
}

….
….
What’s the problem?

Brigand's user avatar

Brigand

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asked Mar 15, 2016 at 2:19

DongYao's user avatar

2

Unexpected token errors in ESLint parsing occur due to incompatibility between your development environment and ESLint’s current parsing capabilities with the ongoing changes with JavaScripts ES6~7.

Adding the «parserOptions» property to your .eslintrc is no longer enough for particular situations, such as using

static contextTypes = { ... } /* react */

in ES6 classes as ESLint is currently unable to parse it on its own. This particular situation will throw an error of:

error Parsing error: Unexpected token =

The solution is to have ESLint parsed by a compatible parser, i.e @babel/eslint-parser or babel-eslint for babel version below v7.

just add:

"parser": "@babel/eslint-parser"

to your .eslintrc file and run npm install @babel/eslint-parser --save-dev or yarn add -D @babel/eslint-parser.

Please note that as the new Context API starting from React ^16.3 has some important changes, please refer to the official guide.

answered Apr 15, 2017 at 12:56

hanorine's user avatar

hanorinehanorine

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11

In my case (im using Firebase Cloud Functions) i opened .eslintrc.json and changed:

"parserOptions": {
  // Required for certain syntax usages
  "ecmaVersion": 2017
},

to:

"parserOptions": {
  // Required for certain syntax usages
  "ecmaVersion": 2020
},

Dmitry Grinko's user avatar

answered Sep 26, 2019 at 19:59

Alvin Konda's user avatar

Alvin KondaAlvin Konda

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3

"parser": "babel-eslint" helped me to fix the issue

{
    "parser": "babel-eslint",
    "parserOptions": {
        "ecmaVersion": 6,
        "sourceType": "module",
        "ecmaFeatures": {
            "jsx": true,
            "modules": true,
            "experimentalObjectRestSpread": true
        }
    },
    "plugins": [
        "react"
    ],
    "extends": ["eslint:recommended", "plugin:react/recommended"],
    "rules": {
        "comma-dangle": 0,
        "react/jsx-uses-vars": 1,
        "react/display-name": 1,
        "no-unused-vars": "warn",
        "no-console": 1,
        "no-unexpected-multiline": "warn"
    },
    "settings": {
        "react": {
            "pragma": "React",
            "version": "15.6.1"
        }
    }
}

Reference

Rajendran Nadar's user avatar

answered Jul 25, 2017 at 9:56

7

ESLint 2.x experimentally supports ObjectRestSpread syntax, you can enable it by adding the following to your .eslintrc: docs

"parserOptions": {
  "ecmaVersion": 6,
  "ecmaFeatures": {
    "experimentalObjectRestSpread": true
  }
},

ESLint 1.x doesn’t natively support the spread operator, one way to get around this is using the babel-eslint parser. The latest installation and usage instructions are on the project readme.

answered Mar 15, 2016 at 6:19

Kevan Ahlquist's user avatar

Kevan AhlquistKevan Ahlquist

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6

I solved this issue by
First, installing babel-eslint using npm

npm install babel-eslint --save-dev

Secondly, add this configuration in .eslintrc file

{
   "parser":"babel-eslint"
}

answered Apr 4, 2019 at 4:04

Joee's user avatar

JoeeJoee

1,79417 silver badges19 bronze badges

1

Originally, the solution was to provide the following config as object destructuring used to be an experimental feature and not supported by default:

{
  "parserOptions": {
    "ecmaFeatures": {
      "experimentalObjectRestSpread": true
    }
  }
}

Since version 5, this option has been deprecated.

Now it is enough just to declare a version of ES, which is new enough:

{
  "parserOptions": {
    "ecmaVersion": 2018
  }
}

answered Mar 16, 2020 at 16:12

Vojtech Ruzicka's user avatar

Vojtech RuzickaVojtech Ruzicka

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I’m using eslint for cloud-functions (development env: flutter 2.2.3).

In my case .eslintrc.json does not exist so I had to update the .eslintrc.js file by including parserOptions: { "ecmaVersion": 2020, }, property at the end of file. My updated .eslintrc.js file looks like this:

module.exports = {
  root: true,
  env: {
    es6: true,
    node: true,
  },
  extends: [
    "eslint:recommended",
    "google",
  ],
  rules: {
    quotes: ["error", "double"],
  },
  
  // Newly added property
  parserOptions: {
    "ecmaVersion": 2020,
  },
};

answered Sep 23, 2021 at 6:49

sh_ark's user avatar

sh_arksh_ark

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1

I solved this problem by setting this in .eslintrc.json file:

"extends": [
    ...,
    "plugin:prettier/recommended"
]

Dharman's user avatar

Dharman

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answered Sep 1, 2021 at 8:55

Pazu's user avatar

PazuPazu

1713 silver badges8 bronze badges

Just for the record, if you are using eslint-plugin-vue, the correct place to add 'parser': 'babel-eslint' is inside parserOptions param.

  'parserOptions': {
    'parser': 'babel-eslint',
    'ecmaVersion': 2018,
    'sourceType': 'module'
  }

https://eslint.vuejs.org/user-guide/#faq

answered Feb 5, 2020 at 23:07

Cristiano's user avatar

CristianoCristiano

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In febrary 2021 you can use theese values

ecmaVersion — set to 3, 5 (default), 6, 7, 8, 9, 10, 11, or 12 to specify the version of ECMAScript syntax you want to use. You can also set to 2015 (same as 6), 2016 (same as 7), 2017 (same as 8), 2018 (same as 9), 2019 (same as 10), 2020 (same as 11), or 2021 (same as 12) to use the year-based naming.

https://eslint.org/docs/user-guide/configuring/language-options#specifying-parser-options

answered Mar 3, 2021 at 17:18

Alexander Shestakov's user avatar

For React + Firebase Functions

Go to : functions -> .eslintrc.js

Add it —
parserOptions: {
ecmaVersion: 8,
},

module.exports = {
  root: true,
  env: {
    es6: true,
    node: true,
  },
  parserOptions: {
    ecmaVersion: 8,
  },
  extends: ["eslint:recommended", "google"],
  rules: {
    quotes: ["error", "double"],
  },
};

answered May 14, 2022 at 6:37

Pankaj Kumar's user avatar

1

In my case adding "parser": "@typescript-eslint/parser", line into my .eslintrc file helped:

  "parser": "@typescript-eslint/parser",
  "parserOptions": {
    "project": ["tsconfig.json"],
    "sourceType": "module",
    "ecmaFeatures": {
      "jsx": true,
      "modules": true,
      "experimentalObjectRestSpread": true
    }
  },

package.json in the same time has these 2 lines:

    "@typescript-eslint/eslint-plugin": "^5.0.0",
    "@typescript-eslint/parser": "^5.0.0",

answered Mar 3 at 14:46

Jack Pts's user avatar

Jack PtsJack Pts

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If you have got a pre-commit task with husky running eslint, please continue reading. I tried most of the answers about parserOptions and parser values where my actual issue was about the node version I was using.

My current node version was 12.0.0, but husky was using my nvm default version somehow (even though I didn’t have nvm in my system). This seems to be an issue with husky itself. So:

  1. I deleted $HOME/.nvm folder which was not deleted when I removed nvm earlier.
  2. Verified node is the latest and did proper parser options.
  3. It started working!

answered Oct 8, 2019 at 11:47

Asim K T's user avatar

Asim K TAsim K T

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I was facing the issue despite implementing all the above solutions. When I downgraded the eslint version, it started working

answered May 5, 2021 at 18:46

Pravin Varma's user avatar

1

.
.
{
    "parserOptions": {
    "ecmaVersion": 2020
},
.
.

Will do the trick.

answered Nov 14, 2022 at 7:09

Krishan Pal's user avatar

1

I had to update the ecmaVersion to "latest"

"parserOptions": {
    "parser": "@babel/eslint-parser",
    "sourceType": "module",
    "ecmaVersion": "latest",
    "ecmaFeatures": {
      "jsx": true,
      "experimentalObjectRestSpread": true
    },
    "requireConfigFile": false
  },

answered Nov 28, 2022 at 20:39

Philip Sopher's user avatar

Philip SopherPhilip Sopher

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I’m using typescript and I solve this error change parser

....
"prettier/prettier": [
            "error",
            {
                .....
                "parser": "typescript",
                .....
            }
        ],
....

answered Apr 28, 2021 at 9:36

Dálcio Macuete Garcia's user avatar

2

by Vladimir Popescu

Being an artist his entire life while also playing handball at a professional level, Vladimir has also developed a passion for all things computer-related. With an innate fascination… read more


Updated on January 31, 2023

  • The cause of unexpected token errors is the incompatibility of the parsers and the coding language.
  • You should have a vast knowledge of JavaScript syntax to understand how to write proper codes.
  • Specifying the parser you want to use can help fix the parsing error: Unexpected token.

The Parsing error unexpected token usually occurs when there is an incompatibility between the parser option and the code. However, in writing JavaScript, developers do come across this error.

This error happens when the development environment is incompatible with the parser’s capabilities. First, we’ll go through the causes of this error and how it often occurs.

As we go further into this article, we’ll guide you through some fixes for the parsing error unexpected token.

What causes the parsing error unexpected token?

When writing a JavaScript application, you can get the error because a specific syntax is missing or added to your code. However, the unexpected token mistake notifies you that JavaScript expects a kind of arrangement in the code you’re writing. An example of what the parsing error unexpected token looks like is:

Nonetheless, you must understand that this error can occur because of different things. JavaScript has expectations.

So, you must know what JavaScript rules and expectations are. Then, it will help you decipher where the issue is.

How can I fix the parsing error unexpected token?

1. Specify the parser you’re using

For ESLint users, you have to specify the parser for ESLint. It is essential because the parser will be able to generate compatible JavaScript syntax that ESLint can read.

A Parser like babel-eslint will be suitable for ESLint. It is because ESLint is not compatible with modern JavaScript syntax. So, you need to specify the parser to use for your configuration.

In the example above, the parser is specific, so ESLint will be able to know what to use. Furthermore, by doing this, you won’t get the parsing error unexpected token ESLint typescript again.

Read more about this topic

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2. Check if your punctuation is incorrect

JavaScript has its syntax, and you must follow the rules that guide it. For example, omitting necessary or adding unknown punctuation marks in your coding will prompt the error.

So, to fix the unexpected token problem, go through your codes for punctuation errors. Punctuation marks like parenthesis and commas must be proper in your coding. If not, JavaScript won’t recognize it and won’t be able to parse it.

In the code above, JavaScript can’t parse it because it expects the parenthesis { to be closed.

3. Check for typos

As said earlier, JavaScript has its syntax. So, its parsers expect every token and symbol to be in a specific order before they can read them.

However, trace your coding to know where the error is from and correct it. Code editors can help you edit your syntax, even before the parser detects it.

It is essential to know the rules of JavaScript syntax and their uses in detail. Then, following the guidelines above, you can fix the parsing error and unexpected token problem.

There are other JavaScript errors that you can come across; visit our page to learn more.

newsletter icon

In this post, we will explore – How To Fix – “Parsing Error: Unexpected Token” in React.

error Parsing error: Unexpected token
ESLint Parsing Error: Unexpected token {
Parsing error: Unexpected token =>
SyntaxError: Unexpected token (

Such “Unexpected token” signify a common behavioural problem  – somewhere in your code a specific construct was supplied, but the system expected something completely different (based on defined rulescustoms). This could be due to a typo mistake, missing something in the code etc. Also could be dev environment and ESLint parsing styles are not compatible owing to the changes for various or upgraded versions.


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Before we try to fix, Let’s do some primitive checks to pinpoint some of the symptoms.

Primitive Check:

  • What version of React are you using ?
  • Have you considered and cross-checked that you have correctly “imported” everything ?
  • Are you able to compile your code using Babel ?
  • Have you tried babel-eslint parser – the newer name is @babel/eslint-parser
  • Does it work in the Browser ?

Once you have been through all the above pointers, try the below options.

Try the latest babel eslint and make sure you follow the compatibility matrix.


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ESLint babel-eslint
4.x >= 6.x
3.x >= 6.x
2.x >= 6.x
1.x >= 5.x

Node version preferably should be 8+.

  • Do the install. The “x.x” & “y” below has to be substituted appropriately as per the above table.
npm install eslint@x.x babel-eslint@y --save-dev

OR

yarn add eslint@x.x babel-eslint@y -D


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  • Go to the .eslintrc (or .eslintrc.json) config file and make the below changes.

Also check what value you have in “.babelrc”.

{
  "parser": "babel-eslint",
}

If above doesn’t work, you could also try,

{
 "parser: "@babel/eslint-parser"
}
  • If applicable, go to your package.json file and check the below.
"scripts": {
    "lint": "eslint"
},
  • You might have two files in your system. There are different versions of ecmaScript with the same name,
    • .eslintrc.js -> es6: true – which was released on June 2015
    • .eslintrc.json -> “ecmaVersion”: 2017 – which is equivalent to es8

If the wrong ecmaScript is being picked up in your case, you can try removing the “.eslintrc.js” file (so as to avoid the conflict) and see if that helps to solve the error.


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  • You can also try changing the ecmaVersion in the .eslintrc.json file.
"parserOptions": {
      // Required for certain syntax usages
      "ecmaVersion": 2020
},

You could also try other values like 2017, 2018 instead of 2020

You can use one of the below ecmaVersion value to specify what version of ECMAScript syntax to use-


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    • 3
    • 5 (default)
    • 6 (also used as 2015)
    • 7 (also used as 2016)
    • 8 (also used as 2017)
    • 9 (also used as 2018)
    • 10 (also used as 2019)
    • 11 (also used as 2020)
    • 12 (also used as 2021)

Hope this helps to solve the error.

Other Interesting Reads –

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  • Fix Spark Error – “org.apache.spark.SparkException: Failed to get broadcast_0_piece0 of broadcast_0”

  • How to Handle Bad or Corrupt records in Apache Spark ?

  • How to use Broadcast Variable in Spark ?

  • Best Practices for Dependency Problem in Spark

  • Sample Code – Spark Structured Streaming vs Spark Streaming

  • Sample Code for PySpark Cassandra Application

  • How to Enable UTF-8 in Python ?

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  • How to Handle Errors and Exceptions in Python ?

  • How to Handle Bad or Corrupt records in Apache Spark ?

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  • What Are The Most Important Metrics to Monitor in Kafka ?

  • How To Connect Local Python to Kafka on AWS EC2 ?

  • How to Send Large Messages in Kafka ?

  • Fix Spark Error – “org.apache.spark.SparkException: Failed to get broadcast_0_piece0 of broadcast_0”


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"parser": "babel-eslint" is OK!

{
    "parser": "babel-eslint",
    "parserOptions": {
        "ecmaVersion": 6,
        "sourceType": "module",
        "ecmaFeatures": {
            "jsx": true,
            "modules": true,
            "experimentalObjectRestSpread": true
        }
    },
    "plugins": [
        "react"
    ],
    "extends": ["eslint:recommended", "plugin:react/recommended"],
    "rules": {
        "comma-dangle": 0,
        "react/jsx-uses-vars": 1,
        "react/display-name": 1,
        "no-unused-vars": "warn",
        "no-console": 1,
        "no-unexpected-multiline": "warn"
    },
    "settings": {
        "react": {
            "pragma": "React",
            "version": "15.6.1"
        }
    }
}

Cover image for [ESLint] Parsing error: unexpected token =>

Hi there!

I’m Arisa, a freelance Full Stack Developer.

I’m developing Lilac, an online school with hands-on Frontend e-books and tutoring👩‍💻

What is this article about?

This is a solution when I saw these errors.

Parsing error: unexpected token =>

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Warning: React version not specified in eslint-plugin-react settings. See https://github.com/yannickcr/eslint-plugin-react#configuration .

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Project environment & full configuration

  • macOS: Catalina 10.15.7
  • VS Code

  • ESLint Version: ^7.15.0

  • Node Version: v12.18.2

  • npm Version: 6.14.5

"babel-eslint": "^10.1.0",
"babel-jest": "^22.4.1",
"babel-preset-env": "^1.6.1",
"concurrently": "^3.6.0",
"eslint": "^7.15.0",
"eslint-plugin-react": "^7.22.0",
"jest": "^22.4.2",
"webpack": "^3.10.0",
"webpack-dev-middleware": "^2.0.4",
"webpack-dev-server": "^2.11.1",
"webpack-hot-middleware": "^2.21.0"

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A very simple project with JS(EcmaScript2016) with webpack, babel, jest and ESLint.

When did this error appear?

While I was running ESLint on my JS files.

How did it solve?

Reason

Lacking out of a package, babel-eslint to install.

Solution steps

  1. Install babel-eslint locally
$ yarn add --dev babel-eslint

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Source: https://github.com/babel/babel-eslint

  1. Add "parser" config in .eslintrc.js
"parser": "babel-eslint"

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Source: https://github.com/eslint/eslint/issues/10137

  1. Remove unnecessary config for non-React project
// "extends": [
//     "eslint:recommended",
//     "plugin:react/recommended"
// ],

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Source: https://github.com/yannickcr/eslint-plugin-react#configuration

No errors✨

Summary

The biggest mistake I had was the React config in a JS project.

Normally, I use React and didn’t realize the wrong config for JS project🤦‍♀️

Hope this article was relevant for what you were looking for!

Happy new year & happy coding🎍

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