eslint.config.mjs

// @ts-check
import globals from "globals";
import eslint from "@eslint/js";
import tseslint from "typescript-eslint";
import stylisticTs from '@stylistic/eslint-plugin-ts';

export default tseslint.config(
  {
    extends: [
      eslint.configs.recommended,
      tseslint.configs.recommendedTypeChecked,
      tseslint.configs.stylisticTypeChecked,
    ],

    files: ["src/**/*.ts"],

    ignores: [
      "bin/",
      "dist/",
      "lib/**/*",
      "**/__tests__/**/*"
    ],

    plugins: {
      '@stylistic/ts': stylisticTs,
      '@typescript-eslint': tseslint.plugin,
    },

    languageOptions: {
      sourceType: "module",
      globals: {
          ...globals.browser,
          ...globals.node,
          ...globals.es2021,
          ...globals.webextensions,
      },
      parserOptions: {
        projectService: true,
        tsconfigRootDir: import.meta.dirname,
      },
    },

    rules: {
      "quotes":                "error",
      "key-spacing":           ["error", { "align": "value" }],
      "comma-dangle":          ["error", "only-multiline"],
      "object-curly-spacing":  ["error", "always"],
      "array-bracket-spacing": "error",
      "indent":                ["error", 2, { "SwitchCase": 1 }],
      "sort-imports":          ["error", { allowSeparatedGroups: true }],

      "@stylistic/ts/semi": "error",

      "@typescript-eslint/array-type": ["error", { default: "generic" }],
      
      // The following rules override the default "error" setting.
      // These cases should be investigated and the overrides 
      // should either be removed or set to "off".
      "@typescript-eslint/no-explicit-any":              "warn",
      "@typescript-eslint/no-floating-promises":         "warn",
      "@typescript-eslint/no-unsafe-argument":           "warn",
      "@typescript-eslint/no-unsafe-assignment":         "warn",
      "@typescript-eslint/no-unsafe-member-access":      "warn",
      "@typescript-eslint/no-unused-expressions":        "warn",
      "@typescript-eslint/no-unsafe-return":             "warn",
      "@typescript-eslint/no-unsafe-call":               "warn",
      "@typescript-eslint/prefer-promise-reject-errors": "warn",
      "@typescript-eslint/prefer-regexp-exec":           "warn",
      "@typescript-eslint/prefer-nullish-coalescing":    "warn",
      "@typescript-eslint/consistent-type-definitions":  "warn",
      "@typescript-eslint/no-misused-promises":          "warn",
      "@typescript-eslint/dot-notation":                 "warn",
      "@typescript-eslint/restrict-plus-operands":       "warn",
    },
  },
);