ESLint Parsing error: Unexpected token

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.

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