{
  "rules": {
    "strict": 2,
    "indent": [2, 2],
    "quotes": [2, "single"],
    "semi": [2, "always"]
  },
  "env": {
    "browser": true,
    "node": true,
    "es6": true
  },
  "extends": "eslint:recommended"
}

{
  "rules": {
    "strict": "error",
    "indent": ["error", 2],
    "quotes": ["error", "single"],
    "semi": ["error", "always"]
  },
  "env": {
    "browser": true,
    "node": true,
    "es6": true
  },
  "extends": "eslint:recommended"
}

Use string instead of number in error level configurations of eslint
Use string instead of number in error level configurations of eslint

This is the refactoring for readability.
