.eslintrc.js

module.exports = {
  env: {
    es6: true
  },
  parserOptions: {
    sourceType: "module",
    ecmaVersion: 6,
    ecmaFeatures: {
      jsx: true
    }
  },
  rules: {
    /* Indentation */
    "no-mixed-spaces-and-tabs": 2,
    indent: [2, 2],
    /* Variable names */
    camelcase: 2,
    /* Language constructs */
    curly: 2,
    eqeqeq: [2, "smart"],
    "func-style": [2, "expression"],
    /* Semicolons */
    semi: 2,
    "no-extra-semi": 2,
    /* Padding & additional whitespace (perferred but optional) */
    "brace-style": [2, "1tbs", { allowSingleLine: true }],
    "semi-spacing": 1,
    "key-spacing": 1,
    "block-spacing": 1,
    "comma-spacing": 1,
    "no-multi-spaces": 1,
    "space-before-blocks": 1,
    "keyword-spacing": [1, { before: true, after: true }],
    "space-infix-ops": 1,
    /* Variable declaration */
    "one-var": [1, { uninitialized: "always", initialized: "never" }],
    /* Minuta */
    "comma-style": [2, "last"],
    quotes: [1, "single"]
  }
};