.eslintrc.json

{
  "env": {
    "browser": true,
    "commonjs": true,
    "es6": true,
    "node": true
  },
  "extends": ["eslint:recommended", "prettier"],
  "rules": {
    "brace-style": "error",
    "camelcase": ["error", { "properties": "never" }],
    "comma-dangle": ["error", "never"],
    "func-call-spacing": ["error", "never"],
    "keyword-spacing": ["error", { "before": true }],
    "space-infix-ops": ["error", { "int32Hint": false }],
    "object-curly-spacing": ["error", "always"],
    "eqeqeq": "warn",
    "indent": ["error", 2, { "SwitchCase": 1 }],
    "key-spacing": ["error", { "beforeColon": false }],
    "no-console": "off",
    "no-fallthrough": "warn",
    "prefer-const": "error",
    "quotes": ["error", "single"],
    "semi": ["error", "never"],
    "react/prop-types": [0]
  }
}

.prettierrc.json

{
  "trailingComma": "all",
  "tabWidth": 2,
  "semi": true,
  "singleQuote": true,
  "endOfLine": "lf"
}