.eslintrc.js

module.exports = {
  root: true,
  parser: "@typescript-eslint/parser",
  parserOptions: {
    tsconfigRootDir: __dirname,
    project: ["./packages/**/tsconfig.json"],
  },
  plugins: ["@typescript-eslint", "node", "import"],
  extends: [
    // Core eslint recommended rules.
    "eslint:recommended",

    // Override those with TypeScript versions, where necessary.
    "plugin:@typescript-eslint/eslint-recommended",

    // Core TypeScript recommended rules - syntax only.
    "plugin:@typescript-eslint/recommended",

    // Core TypeScript recommended rules - full type checking.
    "plugin:@typescript-eslint/recommended-requiring-type-checking",
    "plugin:import/errors",
    "plugin:import/warnings",
    "plugin:import/typescript",
  ],
  rules: {
    // Importing any package in the project will likely work in dev because
    // of the symlinks that yarn workspaces creates in the root node_modules.
    // We can't prevent that, but we can tell eslint to fail.
    // (This rule is poorly named. It should be "no-implicit-import".)
    "node/no-extraneous-import": "error",

    // Be explicit when you must, but return type is usually inferred correctly.
    "@typescript-eslint/explicit-function-return-type": "off",

    // Avoid using "any" or "as any" wherever possible, but this is too onerous.
    "@typescript-eslint/no-explicit-any": "off",

    // Avoid foo!.bar wherever possible, but this is too onerous.
    "@typescript-eslint/no-non-null-assertion": "off",

    // Clean up unused vars before committing, but this is too onerous during dev.
    "@typescript-eslint/no-unused-vars": "warn",
    "@typescript-eslint/no-var-requires": ["off"],
    "@typescript-eslint/no-empty-interface": ["off"],
    "@typescript-eslint/ban-ts-ignore": ["off"],
    "@typescript-eslint/explicit-function-return-type": ["off"],
    "@typescript-eslint/no-empty-function": ["off"],
    "@typescript-eslint/no-unused-expressions": ["off"],
    "@typescript-eslint/no-unsafe-assignment": ["off"],
    "@typescript-eslint/no-unsafe-member-access": ["off"],
    "@typescript-eslint/no-unsafe-call": ["off"],
    "@typescript-eslint/no-unsafe-return": ["off"],
    "@typescript-eslint/restrict-template-expressions": ["off"],
    "@typescript-eslint/explicit-module-boundary-types": ["off"],
    "no-empty": ["off"],
    "require-await": "off",
    "@typescript-eslint/require-await": "off",
    "comma-dangle": ["warn", "always-multiline"],
    "@typescript-eslint/no-unused-vars": ["error", { argsIgnorePattern: "^_" }],
    "@typescript-eslint/no-floating-promises": ["off"],
    "@typescript-eslint/no-misused-promises": ["off"],
    "no-async-promise-executor": "off",
    quotes: ["warn", "double", { allowTemplateLiterals: true, avoidEscape: true }],
    semi: ["error", "always"],
    "import/order": [
      1,
      {
        groups: ["builtin", "external", "internal", "parent", "sibling", "index"],
        "newlines-between": "always",
      },
    ],
  },
};