diff --git a/test/jest-e2e.json b/test/jest-e2e.json
index 40c7cb5e..0a2a5d40 100644
--- a/test/jest-e2e.json
+++ b/test/jest-e2e.json
@@ -5,6 +5,7 @@
   "moduleNameMapper": {
     "^build-info$": "<rootDir>/build-info.json"
   },
+  "setupFiles": ["<rootDir>/test/jest.polyfills.js"],
   "testEnvironment": "node",
   "testRegex": ".e2e-spec.ts$",
   "transform": {
diff --git a/test/jest.polyfills.js b/test/jest.polyfills.js
new file mode 100644
index 00000000..28e94531
--- /dev/null
+++ b/test/jest.polyfills.js
@@ -0,0 +1,31 @@
+// jest.polyfills.js
+/**
+ * @note The block below contains polyfills for Node.js globals
+ * required for Jest to function when running JSDOM tests.
+ * These HAVE to be require's and HAVE to be in this exact
+ * order, since "undici" depends on the "TextEncoder" global API.
+ *
+ * Consider migrating to a more modern test runner if
+ * you don't want to deal with this.
+ */
+
+const { TextDecoder, TextEncoder, ReadableStream } = require("node:util")
+
+Object.defineProperties(globalThis, {
+  TextDecoder: { value: TextDecoder },
+  TextEncoder: { value: TextEncoder },
+  ReadableStream: { value: ReadableStream },
+})
+
+const { Blob, File } = require("node:buffer")
+const { fetch, Headers, FormData, Request, Response } = require("undici")
+
+Object.defineProperties(globalThis, {
+  fetch: { value: fetch, writable: true },
+  Blob: { value: Blob },
+  File: { value: File },
+  Headers: { value: Headers },
+  FormData: { value: FormData },
+  Request: { value: Request },
+  Response: { value: Response },
+})