chore(lint): enable stricter error rules

scripts/dev/discord-acp-plain-language-smoke.ts

@@ -534,7 +534,7 @@ async function requestDiscordJson<T>(params: {
           label: `${params.errorPrefix} ${params.method} ${redactDiscordApiPath(params.path)}`,
           signal: controller.signal,
           maxBytes: responseBodyMaxBytes,
-        }).catch((error) => {
+        }).catch((error: unknown) => {
           if (isTooLargeError(error)) {
             throw error;
           }
@@ -1039,7 +1039,7 @@ async function main(): Promise<number> {
     return 0;
   }
   const result = await run().catch(
-    (err): FailureResult => ({
+    (err: unknown): FailureResult => ({
       ok: false,
       stage: "unexpected",
       smokeId: "n/a",

scripts/dev/ios-node-e2e.ts

@@ -230,7 +230,7 @@ async function main() {
         idempotencyKey: randomUUID(),
       },
       (t.timeoutMs ?? 12_000) + 2_000,
-    ).catch((err) => {
+    ).catch((err: unknown) => {
       results.push({ id: t.id, ok: false, error: formatErr(err) });
       return null;
     });

scripts/dev/realtime-talk-live-smoke.ts

@@ -474,9 +474,9 @@ async function smokeGoogleLiveBrowserWs(browser: Browser, apiKey: string): Promi
               }
               window.clearTimeout(timeout);
               resolve({ setupComplete: true, readyState: ws.readyState });
-            })().catch((error) => {
+            })().catch((error: unknown) => {
               window.clearTimeout(timeout);
-              reject(error);
+              reject(toLintErrorObject(error, "Non-Error rejection"));
             });
           });
           ws.addEventListener("error", () => {
@@ -751,7 +751,7 @@ async function main(): Promise<void> {
 }
 
 if (import.meta.url === pathToFileURL(process.argv[1] ?? "").href) {
-  await main().catch((error) => {
+  await main().catch((error: unknown) => {
     console.error(shortError(error));
     process.exitCode = 1;
   });
@@ -763,3 +763,17 @@ export const testing = {
   readBoundedText,
   resolveOpenAIHttpTimeoutMs,
 };
+
+function toLintErrorObject(value: unknown, fallbackMessage: string): Error {
+  if (value instanceof Error) {
+    return value;
+  }
+  if (typeof value === "string") {
+    return new Error(value);
+  }
+  const error = new Error(fallbackMessage, { cause: value });
+  if ((typeof value === "object" && value !== null) || typeof value === "function") {
+    Object.assign(error, value);
+  }
+  return error;
+}

scripts/dev/tui-pty-test-watch.ts

@@ -288,7 +288,7 @@ async function main(): Promise<void> {
   }
 }
 
-main().catch((error) => {
+main().catch((error: unknown) => {
   process.stderr.write(
     `${error instanceof Error ? error.stack || error.message : String(error)}\n`,
   );