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?
This question is related to
javascript
reactjs
eslint
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"
}
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
}
}
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'
}
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. babel-eslint is a package that saved me recently after reading this page and i decided to add this as an alternative solution for anyone coming later.
just add:
"parser": "babel-eslint"
to your .eslintrc
file and run npm install babel-eslint --save-dev
or yarn add -D babel-eslint
.
Please note that as the new Context API starting from React ^16.3
has some important changes, please refer to the official guide.
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.
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:
$HOME/.nvm
folder which was not deleted when I removed nvm
earlier."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"
}
}
}
Source: Stackoverflow.com