.eslintrc

{
  "parser": "babel-eslint",
  "env": {
    // in CommonJS
    "node": true
  },
  "extends": [
    "defaults/configurations/eslint",
  ],

  "rules": {
    // possible
    "comma-dangle": ["error", "only-multiline"],
    // best practices
    curly: "error",
    no-eval: "error",
    radix: "error",
    no-redeclare: "error",
    no-return-assign: "error",
    no-unmodified-loop-condition: "error",
    no-unused-expressions: ["error", {"allowShortCircuit": true}],
    no-unused-vars: ["error", { "varsIgnorePattern": "_" }],
    no-useless-escape: "error",
    eqeqeq: "error",
    no-multi-spaces: "error",
    block-scoped-var: "error",
    no-use-before-define: "error",

    // styles
    "quotes": [2, "single"],
    "eol-last": [0],
    "no-mixed-requires": [0],
    "no-underscore-dangle": [0],
    "no-console": ["error", {allow: ["log"]}]
  }
}