.eslintrc.json

{
    "parser": "@babel/eslint-parser",
    "plugins": ["prettier", "unused-imports"],
    "extends": ["prettier"],
    "env": {
        "es6": true,
        "browser": true
    },
    "globals": {
        "$": true,
        "jQuery": true,
        "browser": true,
        "ga": true
    },
    "rules": {
        "prettier/prettier": "error",
        "no-unused-vars": [1],
        "no-alert": 0,
        "strict": [2, "never"],
        "new-cap": [0],
        "consistent-return": 0,
        "no-underscore-dangle": 0,
        "no-var": [1],
        "one-var": [0],
        "max-len": [0, { "code": 140, "ignoreUrls": true }],
        "comma-dangle": ["error", "always-multiline"],
        "arrow-parens": 1,
        "unused-imports/no-unused-imports": "error",
        "unused-imports/no-unused-vars": [
            "error",
            {
                "vars": "all",
                "varsIgnorePattern": "^_",
                "args": "after-used",
                "argsIgnorePattern": "^_"
            }
        ]
    }
}