.eslintrc.js

module.exports = {
  parser: "babel-eslint",
  env: {
    browser: true,
    es6: true,
    node: true,
    mocha: true
  },
  plugins: ["prettier", "react"],
  rules: {
    "prettier/prettier": "error",
    "prefer-const": "error",
    "no-use-before-define": ["error", { functions: false, classes: false, variables: true }],
    "no-var": "error",
    "no-throw-literal": "error",
    // Light console usage is useful but remove debug logs before merging to master.
    "no-console": "off",
    "lines-between-class-members": 2,
    "padding-line-between-statements": [
      "error",
      { blankLine: "always", prev: "function", next: "function" },
      { blankLine: "always", prev: "function", next: "class" },
      { blankLine: "always", prev: "class", next: "function" },
      { blankLine: "always", prev: "class", next: "export" },
      { blankLine: "always", prev: "export", next: "function" },
      { blankLine: "always", prev: "export", next: "class" },
      { blankLine: "always", prev: "export", next: "export" },
      { blankLine: "always", prev: "import", next: "function" },
      { blankLine: "always", prev: "import", next: "class" }
    ],
    "no-unused-vars": ["error", { varsIgnorePattern: "^_", argsIgnorePattern: "^_", ignoreRestSiblings: true }]
  },
  extends: ["prettier", "plugin:react/recommended", "eslint:recommended"]
};