.eslintrc.js

module.exports = {
  root: true,
  parser: "@typescript-eslint/parser",
  parserOptions: {
    tsconfigRootDir: __dirname,
    project: ["./tsconfig.json"],
  },
  plugins: ["@typescript-eslint", "mui-unused-classes"],
  extends: [
    "eslint:recommended",
    "airbnb-typescript",
    "plugin:@typescript-eslint/recommended",
    "plugin:@typescript-eslint/recommended-requiring-type-checking",
    "prettier",
  ],
  overrides: [
    {
      files: ["*.ts", "*.tsx"],
      rules: {
        "global-require": 0,
        "import/extensions": 0,
        "@typescript-eslint/no-var-requires": 0,
        "mui-unused-classes/unused-classes": 2,
        "no-void": ["error", { allowAsStatement: true }],
        "react/react-in-jsx-scope": "off", // This isn't true as of React 17
        "react/jsx-indent": "off", // this just argues with prettier, and we validate against prettier anyway
        "react/destructuring-assignment": "off", // This would be nice, but we call a lot of methods on props we pass down which rules it out
        "import/prefer-default-export": "off", // Most of the internet agrees this should be off
        "no-restricted-syntax": [
          // AirBnb don't allow for...of loops. We do, but still want to restrict the rest. Huge argument here: https://github.com/airbnb/javascript/issues/1271
          "error",
          {
            selector: "ForInStatement",
            message:
              "for..in loops iterate over the entire prototype chain, which is virtually never what you want. Use Object.{keys,values,entries}, and iterate over the resulting array.",
          },
          {
            selector: "LabeledStatement",
            message:
              "Labels are a form of GOTO; using them makes code confusing and hard to maintain and understand.",
          },
          {
            selector: "WithStatement",
            message:
              "`with` is disallowed in strict mode because it makes code impossible to predict and optimize.",
          },
        ],
        "react/static-property-placement": [2, "static public field"],
        "no-param-reassign": [2, { props: false }],
      },
    },
    {
      files: ["./*.js"],
      rules: {
        "@typescript-eslint/no-var-requires": "off",
      },
      env: {
        node: true,
      },
    },
    {
      files: ["*.test.*", "*.spec.*"],
      rules: {
        "@typescript-eslint/no-unsafe-member-access": "off",
      },
    },
  ],
};