eslint-config-ts-strict/rules/variables.js

Very strict ESLint config for projects using TypeScript, React and Prettier. ESLint v9 flat config only. Formatting rules disabled to prevent Prettier conflicts.

import confusingBrowserGlobals from "confusing-browser-globals";

export default {
  rules: {
    // disallow the catch clause parameter name being the same as a variable in the outer scope
    "no-catch-shadow": "off",

    // disallow deletion of variables
    "no-delete-var": "error",

    // disallow labels that share a name with a variable
    // https://eslint.org/docs/rules/no-label-var
    "no-label-var": "error",

    // disallow specific globals
    "no-restricted-globals": [
      "error",
      {
        name: "isFinite",
        message:
          "Use Number.isFinite instead https://github.com/airbnb/javascript#standard-library--isfinite",
      },
      {
        name: "isNaN",
        message:
          "Use Number.isNaN instead https://github.com/airbnb/javascript#standard-library--isnan",
      },
    ].concat(confusingBrowserGlobals),

    // disallow shadowing of names such as arguments
    "no-shadow-restricted-names": "error",

    // disallow use of undeclared variables unless mentioned in a /*global */ block
    "no-undef": "error",

    // disallow use of undefined when initializing variables
    "no-undef-init": "error",

    // disallow use of undefined variable
    // https://eslint.org/docs/rules/no-undefined
    // TODO: enable?
    "no-undefined": "off",
  },
};