eslint.config.js

import js from "@eslint/js";
import tseslint from "typescript-eslint";
import { defineConfig } from "eslint/config";

export default defineConfig([
  {
    files: ["**/*.{js,mjs,cjs,ts}"],
    plugins: { js },
    extends: ["js/recommended"],
  },
  {
    files: ["**/*.{js,mjs,cjs,ts}"],
  },
  ...tseslint.configs.recommended,
  {
    files: ["**/*.ts"],
    languageOptions: {
      parser: tseslint.parser,
      parserOptions: {
        project: "./tsconfig.json",
      },
    },
    plugins: {
      "@typescript-eslint": tseslint.plugin,
    },
    rules: {
      // Disable JS rule and enable TS equivalent
      "no-unused-vars": "off",
      "@typescript-eslint/no-unused-vars": "warn",

      // Typed linting rules
      "@typescript-eslint/explicit-function-return-type": "error",
      "@typescript-eslint/no-explicit-any": "off",
      "@typescript-eslint/strict-boolean-expressions": "off",
      "@typescript-eslint/no-floating-promises": "error",
      "@typescript-eslint/prefer-nullish-coalescing": "warn",
      "@typescript-eslint/prefer-optional-chain": "error",
      "@typescript-eslint/no-unnecessary-type-assertion": "error",
      "@typescript-eslint/no-unnecessary-condition": "warn",
      "@typescript-eslint/prefer-ts-expect-error": "error",
      "@typescript-eslint/ban-ts-comment": ["error", { "ts-expect-error": "allow-with-description" }],

      // Code style
      "@typescript-eslint/consistent-type-definitions": ["error", "interface"],
      "@typescript-eslint/consistent-type-assertions": "error",
      "@typescript-eslint/explicit-member-accessibility": ["error", { accessibility: "explicit" }],
      "@typescript-eslint/no-non-null-assertion": "error",
    },
  },
  {
    files: ["eslint.config.js"],
    rules: {
      "@typescript-eslint/explicit-function-return-type": "off",
      "@typescript-eslint/strict-boolean-expressions": "off",
    },
  },
  {
    ignores: ["node_modules", "dist", "dist-cjs", "**/*.cjs"],
  },
]);