fix: browser-pool stub type errors, silent-fallback regression, grokClearance signature

Pre-merge fixes for the CloakBrowser/Playwright extraction into the
optional @omniroute/browser-pool workspace package:

- Add the @omniroute/browser-pool path mapping to the root tsconfig.json
  (tsconfig.typecheck-core.json extends the root, not open-sse/tsconfig.json,
  so typecheck:core was failing with 3x TS2307 in browserPool.ts).
- tryBackedChat() in browserBackedChat.ts silently returned the stale
  httpResult (the unsolved challenge/403 body) when the optional
  browser-pool package was absent, instead of surfacing an error. Now
  throws a descriptive error so callers (claude-web, duckduckgo-web) and
  upstream fallback handling can react correctly instead of treating an
  unsolved challenge as a definitive response. Restored
  resolveBrowserContextProxy (dropped during the browserPool.ts merge
  conflict resolution against origin/release/v3.8.49) which
  tests/unit/browserPool-proxy.test.ts already depends on.
- Fix acquireFreshGrokClearance stub signature in grokClearance.ts to
  match the real package impl and the grok-web.ts caller:
  (signal?: AbortSignal | null) => Promise<string | null>, not
  (prompt: string) => Promise<PooledContext | null>.
- Add tests/unit/browserBackedChat-optional-package-absent.test.ts
  covering the previously-silent "package absent + challenge response"
  regression, plus a __setBrowserPoolModOverrideForTesting() hook to
  simulate that path deterministically.

Co-authored-by: diegosouzapw <8016841+diegosouzapw@users.noreply.github.com>

open-sse/services/browserBackedChat.ts

@@ -48,7 +48,26 @@ export interface BrowserPoolModule {
   setProxyResolver(fn: ProxyResolver): void;
 }
 let modPromise: Promise<BrowserPoolModule | null> | null = null;
+// Test-only escape hatch: lets tests simulate the "optional @omniroute/browser-pool
+// package is not installed" path deterministically, without depending on a real
+// failing dynamic import (which can otherwise trip unrelated module-resolution
+// network fallbacks and hang the test process).
+let modOverride: BrowserPoolModule | null | undefined = undefined;
+
+export function __setBrowserPoolModOverrideForTesting(
+  value: BrowserPoolModule | null | undefined
+): void {
+  modOverride = value;
+  modPromise = null;
+}
+
+export function __resetBrowserPoolModOverrideForTesting(): void {
+  modOverride = undefined;
+  modPromise = null;
+}
+
 function getMod(): Promise<BrowserPoolModule | null> {
+  if (modOverride !== undefined) return Promise.resolve(modOverride);
   if (!modPromise) {
     modPromise = import("@omniroute/browser-pool").catch(() => null);
   }
@@ -276,8 +295,23 @@ export async function tryBackedChat(
     // Need browser-backed path — await the module
     const loaded = await mod;
 
+    // The optional @omniroute/browser-pool package is not installed. Unlike
+    // the pre-refactor inline implementation (which always had the browser
+    // fallback available), there is no way to solve the challenge here —
+    // silently returning the stale httpResult (the 403/challenge body) would
+    // make callers (claude-web, duckduckgo-web) treat an unsolved challenge
+    // as a definitive upstream response. Throw instead so upstream fallback
+    // handling (combo routing / executor error paths) can react correctly.
+    if (!loaded) {
+      throw new Error(
+        "tryBackedChat: upstream returned a challenge response " +
+          `(status ${httpResult.status}) and the optional @omniroute/browser-pool ` +
+          "package is not installed — cannot solve the challenge. Install " +
+          "@omniroute/browser-pool to enable the browser-backed fallback."
+      );
+    }
+
     // Get fresh cookies via browser
-    if (loaded) {
     try {
       const fresh = await loaded.getFreshCookiesWithWarmup(req);
       if (fresh) {
@@ -317,9 +351,6 @@ export async function tryBackedChat(
       }
       throw inner;
     }
-    }
-
-    return httpResult;
   } catch (err: unknown) {
     if (err instanceof DOMException && err.name === "AbortError") {
       return {

open-sse/services/browserPool.ts

@@ -146,6 +146,21 @@ export async function resolvePlaywrightProxy(
   }
 }
 
+/**
+ * Resolve the proxy for a browser-pool context key. Scoped context keys
+ * (e.g. "claude-web:account-scope") carry a stable `proxyProviderKey` so the
+ * proxy lookup always targets the underlying provider, not the scoped key.
+ * Kept inline alongside resolvePlaywrightProxy — trivial wrapper, no
+ * playwright/browser-pool dependency.
+ */
+export async function resolveBrowserContextProxy(
+  contextKey: string,
+  options: Pick<BrowserPoolContextOptions, "proxyProviderKey">,
+  deps?: ResolvePlaywrightProxyDeps
+): Promise<import("playwright").LaunchOptions["proxy"] | undefined> {
+  return resolvePlaywrightProxy(options.proxyProviderKey ?? contextKey, deps);
+}
+
 // ---------------------------------------------------------------------------
 // getBrowserPoolStatus — INLINE (returns disabled status)
 // ---------------------------------------------------------------------------

open-sse/services/grokClearance.ts

@@ -1,5 +1,3 @@
-import type { PooledContext } from "@omniroute/browser-pool";
-
 export function shouldUseGrokBrowserBacked(): boolean {
   const flag = process.env.WEB_COOKIE_USE_BROWSER;
   if (flag === "1" || flag === "true" || flag === "on") return true;
@@ -7,16 +5,20 @@ export function shouldUseGrokBrowserBacked(): boolean {
   return poolFlag === "on" || poolFlag === "1" || poolFlag === "true";
 }
 
-let grokClearanceAcquireOverride: ((prompt: string) => Promise<PooledContext | null>) | null = null;
+let grokClearanceAcquireOverride:
+  ((signal?: AbortSignal | null) => Promise<string | null>)
+  | null = null;
 
 export function __setGrokClearanceAcquireOverrideForTesting(
-  fn: ((prompt: string) => Promise<PooledContext | null>) | null,
+  fn: ((signal?: AbortSignal | null) => Promise<string | null>) | null,
 ): void {
   grokClearanceAcquireOverride = fn;
 }
 
-export async function acquireFreshGrokClearance(prompt: string): Promise<PooledContext | null> {
-  if (grokClearanceAcquireOverride) return grokClearanceAcquireOverride(prompt);
+export async function acquireFreshGrokClearance(
+  signal?: AbortSignal | null,
+): Promise<string | null> {
+  if (grokClearanceAcquireOverride) return grokClearanceAcquireOverride(signal);
   const mod = await import("@omniroute/browser-pool");
-  return mod.acquireFreshGrokClearance(prompt);
+  return mod.acquireFreshGrokClearance(signal);
 }

tests/unit/browserBackedChat-optional-package-absent.test.ts

@@ -0,0 +1,92 @@
+import assert from "node:assert/strict";
+import { describe, it } from "node:test";
+
+import {
+  __resetBrowserPoolModOverrideForTesting,
+  __resetHttpBackedChatOverrideForTesting,
+  __setBrowserPoolModOverrideForTesting,
+  __setHttpBackedChatOverrideForTesting,
+  tryBackedChat,
+} from "../../open-sse/services/browserBackedChat.ts";
+
+// Regression test for the "optional @omniroute/browser-pool package absent"
+// path in tryBackedChat(). Before the fix, when the upstream returned a
+// challenge response (e.g. 403) and the optional browser-pool package was
+// not installed (getMod() resolves to null — the same shape a real failed
+// `import("@omniroute/browser-pool")` produces), tryBackedChat() silently
+// returned the stale challenge result instead of surfacing a clear error —
+// callers (claude-web, duckduckgo-web) would then treat the unsolved
+// challenge as a definitive upstream response.
+//
+// __setBrowserPoolModOverrideForTesting(null) simulates the module-absent
+// case deterministically (same as getMod() catching a failed dynamic
+// import), without depending on a real failing dynamic import of a
+// nonexistent package.
+describe("tryBackedChat — optional @omniroute/browser-pool package absent", () => {
+  it("throws a descriptive error instead of silently returning the stale challenge response", async () => {
+    __setBrowserPoolModOverrideForTesting(null);
+    __setHttpBackedChatOverrideForTesting(async () => ({
+      status: 403,
+      contentType: "text/html",
+      body: Buffer.from("<html>Just a moment...</html>"),
+      isStealth: true,
+      timing: {
+        acquireContextMs: 0,
+        navigateMs: 0,
+        submitMs: 0,
+        captureResponseMs: 0,
+        totalMs: 0,
+      },
+    }));
+
+    try {
+      await assert.rejects(
+        () =>
+          tryBackedChat({
+            poolKey: "duckduckgo-web",
+            chatUrl: "https://duck.ai/duckchat/v1/chat",
+            userMessage: "hello",
+          }),
+        (err: unknown) => {
+          assert.ok(err instanceof Error);
+          // Must NOT resolve with the stale challenge body — must throw with
+          // enough context to diagnose (challenge status + missing package).
+          assert.match(err.message, /challenge/i);
+          assert.match(err.message, /@omniroute\/browser-pool/);
+          assert.match(err.message, /403/);
+          return true;
+        }
+      );
+    } finally {
+      __resetHttpBackedChatOverrideForTesting();
+      __resetBrowserPoolModOverrideForTesting();
+    }
+  });
+
+  it("returns the httpResult directly when it is not a challenge response (2xx path unaffected)", async () => {
+    __setHttpBackedChatOverrideForTesting(async () => ({
+      status: 200,
+      contentType: "application/json",
+      body: Buffer.from(JSON.stringify({ ok: true })),
+      isStealth: true,
+      timing: {
+        acquireContextMs: 0,
+        navigateMs: 0,
+        submitMs: 0,
+        captureResponseMs: 0,
+        totalMs: 0,
+      },
+    }));
+
+    try {
+      const result = await tryBackedChat({
+        poolKey: "duckduckgo-web",
+        chatUrl: "https://duck.ai/duckchat/v1/chat",
+        userMessage: "hello",
+      });
+      assert.equal(result.status, 200);
+    } finally {
+      __resetHttpBackedChatOverrideForTesting();
+    }
+  });
+});

tsconfig.json

@@ -19,7 +19,8 @@
     "paths": {
       "@/*": ["./src/*"],
       "@omniroute/open-sse": ["./open-sse"],
-      "@omniroute/open-sse/*": ["./open-sse/*"]
+      "@omniroute/open-sse/*": ["./open-sse/*"],
+      "@omniroute/browser-pool": ["./packages/browser-pool/src"]
     },
     "plugins": [
       {