Try to fix

eslint.config.mjs

@@ -0,0 +1,28 @@
+import globals from "globals";
+import pluginJs from "@eslint/js";
+import tseslint from "typescript-eslint";
+
+/** @type {import('eslint').Linter.Config[]} */
+export default [
+    { ignores: [ "node_modules", "test_src", "src/lib" ] },
+    {
+        files: [ "**/*.{js,mjs,cjs,ts}" ],
+        languageOptions: {
+            globals: {
+                ...globals.browser,
+                ...globals.es2021
+            },
+            parser: tseslint.parser,
+            parserOptions: {
+                ecmaVersion: "latest",
+                sourceType: "module"
+            }
+        },
+        rules: {
+            "@typescript-eslint/no-namespace": "off",
+            "semi": [ 1, "always" ]
+        }
+    },
+    pluginJs.configs.recommended,
+    ...tseslint.configs.recommended
+];

jest.config.json

@@ -4,7 +4,7 @@
   "coverageProvider": "babel",
   "maxWorkers": "50%",
   "transform": {
-    "^.+\\.tsx?$": ["ts-jest", { "isolatedModules": true }]
+    "^.+\\.tsx?$": ["ts-jest", { }]
   },
   "testEnvironment": "jest-environment-node",
   "verbose": true