Cover word-joiner wrapper baseURL rejection

Co-authored-by: Eric Allam <eric@trigger.dev>

Author: cursoragent

docs/tasks/streams.mdx

@@ -669,6 +669,7 @@ Examples:
 - ✅ `https://api.trigger.dev/custom%20prefix` (percent-encoded whitespace)
 - ✅ `https://api.trigger.dev/custom%3Fprefix%23segment` (percent-encoded `?` / `#`)
 - ✅ `\uFEFFhttps://api.trigger.dev/custom-prefix/\uFEFF` (BOM wrapper trimmed)
+- ❌ `\u2060https://api.trigger.dev/custom-prefix/\u2060` (word-joiner wrappers are rejected)
 - ❌ `https://api.trigger.dev?foo=bar`
 - ❌ `https://api.trigger.dev#fragment`
 - ❌ `https://user:pass@api.trigger.dev`

packages/ai/README.md

@@ -176,6 +176,7 @@ Examples:
 - ✅ `https://api.trigger.dev/custom%20prefix` (percent-encoded whitespace)
 - ✅ `https://api.trigger.dev/custom%3Fprefix%23segment` (percent-encoded `?` / `#`)
 - ✅ `\uFEFFhttps://api.trigger.dev/custom-prefix/\uFEFF` (BOM wrapper trimmed)
+- ❌ `\u2060https://api.trigger.dev/custom-prefix/\u2060` (word-joiner wrappers are rejected)
 - ❌ `https://api.trigger.dev?foo=bar` (query string)
 - ❌ `https://api.trigger.dev#fragment` (hash fragment)
 - ❌ `https://user:pass@api.trigger.dev` (credentials)

packages/ai/src/chatTransport.test.ts

@@ -874,6 +874,17 @@ describe("TriggerChatTransport", function () {
     }).toThrowError("baseURL must not contain internal whitespace characters");
   });
 
+  it("throws when baseURL is wrapped with word-joiner characters", function () {
+    expect(function () {
+      new TriggerChatTransport({
+        task: "chat-task",
+        accessToken: "pk_trigger",
+        baseURL: "\u2060https://api.trigger.dev/custom-prefix/\u2060",
+        stream: "chat-stream",
+      });
+    }).toThrowError("baseURL must not contain internal whitespace characters");
+  });
+
   it("throws when baseURL contains internal BOM characters", function () {
     expect(function () {
       new TriggerChatTransport({
@@ -3646,6 +3657,17 @@ describe("TriggerChatTransport", function () {
     }).toThrowError("baseURL must not contain internal whitespace characters");
   });
 
+  it("throws from factory when baseURL is wrapped with word-joiner characters", function () {
+    expect(function () {
+      createTriggerChatTransport({
+        task: "chat-task",
+        accessToken: "pk_trigger",
+        baseURL: "\u2060https://api.trigger.dev/custom-prefix/\u2060",
+        stream: "chat-stream",
+      });
+    }).toThrowError("baseURL must not contain internal whitespace characters");
+  });
+
   it("throws from factory when baseURL contains internal BOM characters", function () {
     expect(function () {
       createTriggerChatTransport({