.eslintrc.json

{
  "env": {
    "browser": true,
    "es6": true
  },
  "extends": [
    "eslint:recommended",
    "plugin:react/recommended",
    "plugin:jest/recommended"
  ],
  "parser": "babel-eslint",
  "parserOptions": {
    "ecmaFeatures": {
      "modules": true
    },
    "ecmaVersion": 2018,
    "sourceType": "module"
  },
  "plugins": ["babel", "markdown"],
  "rules": {
    "array-callback-return": 2,
    "arrow-body-style": 2,
    "comma-dangle": 0,
    "babel/no-invalid-this": 2,
    "default-case": 2,
    "eqeqeq": [2, "smart"],
    "jest/expect-expect": 0,
    "jest/no-conditional-expect": 0,
    "jsx-quotes": ["error", "prefer-single"],
    "linebreak-style": [2, "unix"],
    "no-console": 0,
    "no-mixed-spaces-and-tabs": 1,
    "no-self-compare": 2,
    "no-underscore-dangle": [2, { "allowAfterThis": true }],
    "no-unused-vars": [1, { "ignoreRestSiblings": true }],
    "no-useless-concat": 2,
    "no-var": 2,
    "object-shorthand": 1,
    "prefer-const": 1,
    "react/prop-types": 0,
    "require-await": 2,
    "semi": [1, "always"],
    "valid-typeof": 2
  },
  "settings": {
    "import/resolver": {
      "babel-module": {},
      "node": {
        "extensions": [".js", ".jsx", ".ts", ".tsx"],
        "paths": ["src"]
      }
    },
    "react": {
      "pragma": "React",
      "version": "detect"
    }
  },
  "overrides": [
    {
      "files": ["*.md"],
      "rules": {
        "no-undef": 0,
        "react/jsx-no-undef": 0,
        "react/react-in-jsx-scope": 0,
        "semi": 0
      }
    },
    {
      "env": {
        "es6": true,
        "browser": true
      },
      "files": ["**/*.ts", "**/*.tsx"],
      "parserOptions": {
        "ecmaFeatures": {
          "modules": true,
          "jsx": true
        },
        "ecmaVersion": 2018,
        "sourceType": "module"
      },
      "plugins": ["babel", "markdown", "prettier", "react"],
      "rules": {
        "react-hooks/exhaustive-deps": 0,
        "react-native/no-inline-styles": 0,
        "array-callback-return": 2,
        "arrow-body-style": 2,
        "comma-dangle": 0,
        "babel/no-invalid-this": 2,
        "default-case": 2,
        "eqeqeq": [2, "smart"],
        "linebreak-style": [2, "unix"],
        "jsx-quotes": ["error", "prefer-single"],
        "no-console": 0,
        "no-mixed-spaces-and-tabs": 1,
        "no-self-compare": 2,
        "no-shadow": 0,
        "no-underscore-dangle": [2, { "allowAfterThis": true }],
        "no-unused-vars": [1, { "ignoreRestSiblings": true }],
        "no-useless-concat": 2,
        "no-var": 2,
        "object-shorthand": 1,
        "prefer-const": 1,
        "react/prop-types": 0,
        "require-await": 2,
        "semi": [1, "always"],
        "valid-typeof": 2
      }
    }
  ]
}