.eslintrc.json

{
    "parserOptions": {
        "ecmaVersion": 5,
        "sourceType": "module"
    },
    "env": {
        "browser": true,
        "commonjs": true
    },

    "extends": "eslint:recommended",

    "rules": {
        "no-console": 0,

        "array-callback-return": 2,
        "curly": ["error", "all"],
        "eqeqeq": ["error", "allow-null"],
        "dot-notation": 2,

        // style

        "array-bracket-spacing": ["error", "never"],
        // block-spacing?
        "brace-style": ["error", "stroustrup"],
        "camelcase": 2,
        "comma-spacing": 2,
        "comma-style": 2,
        "computed-property-spacing": 2,
        // consistent-this?
        "eol-last": 2,
        "indent": ["error", 4],
        "key-spacing": ["error", {
            "mode": "minimum"
        }],
        "keyword-spacing": 2,
        // linebreak-style?
        "max-len": ["warn", 80],
        // other max-*?
        "no-array-constructor": 2,
        "no-inline-comments": 2,
        "no-lonely-if": 2,
        "no-multiple-empty-lines": 1,
        "no-nested-ternary": 2,
        "no-new-object": 2,
        "no-plusplus": 2,
        // no-restricted-syntax maybe? discourage `with`?
        "no-trailing-spaces": 2, // !!!!!!!!!!!!!!!!!!!
        "no-spaced-func": 2,
        "no-unneeded-ternary": 2,
        "no-whitespace-before-property": 2,
        "object-curly-spacing": ["error", "always"],
        // operator-linebreak? operator-assignment?
        "quote-props": ["error", "as-needed"],
        "quotes": ["error", "single"],
        "semi": ["error", "always"],
        "space-in-parens": ["error", "never"],
        "spaced-comment": ["error", "always", {
            "markers": ["global"]
        }]
    }
}