Eslint gives error: Configuration for rule "strict" is invalid: Value "error" is the wrong type

Question

I tried to use Eslint with the following option:

 { "rules": { "indent": [ 2, 2, { "SwitchCase": 1 } ], "space-before-function-paren": [ 2, { "anonymous": "always", "named": "never" } ], "no-use-before-define": [ 2, "nofunc" ], // TODO: turn on later "comma-dangle": [ 0 ], "prefer-template": 0 }, "env": { "node": true, "mocha": true }, "extends": [ "eslint:recommended", "airbnb/base" ] }

And I am getting the error:

Error: ... ... /node_modules/eslint-config-airbnb-base/index.js: Configuration for rule "strict" is invalid: Value "error" is the wrong type.

Referenced from: airbnb/base

I think that this value: 'error' is causing the error.

eslint-config-airbnb-base/rules/strict.js

 module.exports = { rules: { // babel inserts `'use strict';` for us strict: ['error', 'never'] } };

How can I resolve this error?

Answer 1

Severity configuration strings ( "off" , "warn" and "error" ) were introduced in version 2.3.0 of ESLint. Upgrading to that - or a later - version should fix your problem.

Answer 2

If you don't have the eslint resource file .eslintrc.json in your project root with the "rules.semi" set, you can also have this problem.

This sample resource file can fix the error

$ cat .eslintrc.json 
{
    "parserOptions": {
        "ecmaVersion": 6,
        "sourceType": "module",
        "ecmaFeatures": {
            "jsx": true
        }
    },
    "rules": {
        "semi": "error"
    }
}