.eslintrc.json

{
    "env": {
        "browser": true,
        "es6": true,
        "amd": true
    },
    "extends": [
        "eslint:recommended",
        "standard-react"
    ],
    "globals": {
        "Atomics": "readonly",
        "SharedArrayBuffer": "readonly"
    },
    "parserOptions": {
        "ecmaFeatures": {
            "jsx": true
        },
        "ecmaVersion": 2018,
        "sourceType": "module"
    },
    "plugins": [
        "react"
    ],
    "rules": {
        "indent": [
            "error",
            2,
            {
                "SwitchCase": 1
            }
        ],
        "linebreak-style": [
            "error",
            "unix"
        ],
        "semi": [
            "error",
            "always"
        ],
        "max-len": [
            "error",
            {
                "code": 120,
                "ignoreUrls": true,
                "ignoreStrings": true,
                "ignoreRegExpLiterals": true,
                "ignoreTemplateLiterals": true
            }
        ],
        "react/jsx-indent": [
            "error",
            2
        ],
        "react/jsx-indent-props": [
            2,
            2
        ],
        "no-undef": "error",
        "no-unused-vars": "error",
        "no-useless-concat": "error",
        "no-useless-escape": "error",
        "react/no-unknown-property": 0,
        "no-use-before-define": "error",
        "no-underscore-dangle": "error",
        "no-irregular-whitespace": "error",
        "space-after-function-name": "always"
    }
}