Ошибка parsing error unexpected token

asked Mar 15, 2016 at 2:19

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

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
},

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

"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

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

Vojtech RuzickaVojtech Ruzicka

15.9k15 gold badges63 silver badges64 bronze badges

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

CristianoCristiano

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answered Sep 1, 2021 at 8:55

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

Asim K TAsim K T

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answered May 5, 2021 at 18:46

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

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

answered Apr 28, 2021 at 9:36

Philip SopherPhilip Sopher

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