Start a local Chrome when the target is an explicit local and none answers

Dedicated profile (~/.chrome-cdp-profile), macOS only, never for the
castle default. BU_LOCAL_CHROME_LAUNCH=off disables it.

1 files changed, 13 insertions, 0 deletions

diff --git a/src/cdp/discovery.ts b/src/cdp/discovery.ts
index 7aa35f6..ea75c5c 100644
--- a/src/cdp/discovery.ts
+++ b/src/cdp/discovery.ts
@@ -8,6 +8,7 @@ import { type CdpError, cdpError } from "./errors";
 import { asString, errnoCode, isRecord } from "../util/guards";
 import { describeCdpTarget, resolveCdpTarget } from "./endpoint";
 import { readTarget } from "./target-store";
+import { defaultLaunchDeps, launchLocalChrome, planLocalLaunch } from "./local-launch";
 
 const PORT_PROBE_DEADLINE_MS = 30_000;
 const PORT_PROBE_INTERVAL_MS = 1_000;
@@ -153,6 +154,18 @@ export const discoverEndpoint = async (): Promise<Result<CdpEndpoint, CdpError>>
     // through to the local browser the extension was originally written for.
   }
 
+  const found = await discoverLocalEndpoint();
+  if (found.success || target.kind !== "local") return found;
+
+  // FORK: an explicit local target with no browser to attach to starts one (src/cdp/local-launch.ts).
+  const plan = planLocalLaunch();
+  if (plan.kind === "skip") return found;
+  const launched = await launchLocalChrome(plan.plan, defaultLaunchDeps((port) => queryLiveWsUrl(port)));
+  if (launched.success) return ok({ wsUrl: launched.data });
+  return err(cdpError("discovery_failed", `${found.error.message}\n\nAuto-launch of local Chrome failed: ${launched.error}`));
+};
+
+const discoverLocalEndpoint = async (): Promise<Result<CdpEndpoint, CdpError>> => {
   const dirs = userDataDirCandidates();
 
   const candidates: Candidate[] = [];