.eslintrc.json

{
  "parser": "babel-eslint",
  "extends": ["airbnb", "plugin:prettier/recommended", "prettier/react"],
  "plugins": ["jest", "prettier", "react-hooks"],
  "env": {
    "browser": true,
    "commonjs": true,
    "es6": true,
    "jest": true,
    "node": true
  },
  "parserOptions": {
    "ecmaVersion": 9,
    "sourceType": "module",
    "ecmaFeatures": {
      "spread": true
    }
  },
  "rules": {
    // general ESLint rules
    "arrow-parens": "off",
    "prefer-spread": "error",
    "semi": ["error", "never"],
    "no-class-assign": "off",
    "no-case-declarations": "off",
    "no-unused-expressions": 0,
    "require-await": "error",
    "jsx-a11y/href-no-hash": ["off"],
    "react/jsx-filename-extension": ["warn", { "extensions": [".js", ".jsx"] }],
    "max-len": [
      "warn",
      {
        "code": 80,
        "tabWidth": 2,
        "comments": 80,
        "ignoreComments": false,
        "ignoreTrailingComments": true,
        "ignoreUrls": true,
        "ignoreStrings": true,
        "ignoreTemplateLiterals": true,
        "ignoreRegExpLiterals": true
      }
    ],
    "jest/consistent-test-it": [
      "error",
      {
        "fn": "it",
        "withinDescribe": "it"
      }
    ],
    "jest/expect-expect": "error",
    "jest/no-disabled-tests": "warn",
    "jest/no-focused-tests": "warn",
    "jest/no-identical-title": "error",
    "jest/no-jest-import": "error",
    "jest/prefer-strict-equal": "warn",
    "jest/prefer-to-be-null": "error",
    "jest/prefer-to-be-undefined": "error",
    "jest/prefer-to-have-length": "error",
    "jest/valid-expect": "error",
    // rules for https://github.com/prettier/eslint-plugin-prettier
    "prettier/prettier": [
      "error",
      {
        "arrowParens": "avoid",
        "bracketSpacing": true,
        "printWidth": 80,
        "semi": false,
        "singleQuote": true,
        "trailingComma": "all"
      }
    ],
    "react/jsx-props-no-spreading": "off",
    "react/prop-types": "off",
    // custom
    "camelcase": "off"
  }
}