.eslintrc

{
  "parser": "@babel/eslint-parser",
  "parserOptions": {
    "requireConfigFile": false
  },
  "extends": "airbnb-base",
  "root": true,
  "env": {
    "es6": true,
    "jest/globals": true
  },
  "plugins": ["jest", "require-sort"],
  "rules": {
    // Spacing in brackets is consistent and readable
    "array-bracket-spacing": ["error", "always"],
    // Spacing in brackets is consistent and readable
    "computed-property-spacing": ["error", "always"],
    // Allow clean function parens
    "arrow-parens": [
      "error",
      "as-needed",
      {
        "requireForBlockBody": false
      }
    ],
    // Spacing in brackets is consistent and readable
    "space-in-parens": [
      "error",
      "always",
      {
        "exceptions": ["empty"]
      }
    ],
    // Doesn't really help to check if the module is on the filesystem, and can harm when using Docker etc: https://github.com/benmosher/eslint-plugin-import/blob/master/docs/rules/no-unresolved.md
    "import/no-unresolved": "off",
    // Do not require .js/ts extensions, except for .json
    "import/extensions": [
      "error",
      "never",
      {
        "json": "always"
      }
    ],
    // Preferable, but the author should know best for the situation
    "import/prefer-default-export": "off",
    // Windows users may checkout as CRLF, but check in as LF, which this rule breaks
    "linebreak-style": "off",
    // There's no need to have more than 1 empty line, ever
    "no-multiple-empty-lines": [
      "error",
      {
        "max": 1
      }
    ],
    // Allow nested ternary
    "no-nested-ternary": "off",
    // No unused variables except when prepended with _, to indicate that they're not to be used, but require definition to be valid code
    "no-unused-vars": [
      "error",
      {
        "ignoreRestSiblings": true,
        "argsIgnorePattern": "^_"
      }
    ],
    // https://eslint.org/docs/rules/no-shadow seems sensible to not have shadow variables, but can get annoying real quick, especially in the case of reducers
    "no-shadow": "off",
    // Be consistent about where the object braces go
    "object-curly-newline": [
      "error",
      {
        "consistent": true
      }
    ],
    // Object properties either on the same line, or all on separate, consistently
    "object-property-newline": [
      "error",
      {
        "allowAllPropertiesOnSameLine": true
      }
    ],
    // Semi colons are visual garbage
    "semi": ["error", "never"],
    // For the few semi-colons required (e.g. inline array operations), place them at the beginning of the statement
    "semi-style": ["error", "first"],
    // This plugin sorts alphabetically by default
    "require-sort/require-sort": [
      "error",
      {
        "ignoreCase": false,
        "ignoreDeclarationSort": false,
        "ignorePropertySort": false,
        "propertySyntaxSortOrder": ["none", "single", "multiple"]
      }
    ],
    // Add new line between imports
    "import/order": "off",
    "sort-imports": "off",
    "jest/no-disabled-tests": "warn",
    "jest/no-focused-tests": "error",
    "jest/no-identical-title": "error",
    "jest/prefer-to-have-length": "warn",
    "jest/valid-expect": "error",
    "default-param-last": "off"
  }
}