Add assertOk to trace async stack traces

bot/src/util.ts

@@ -86,6 +86,23 @@ export async function tryDo<TResult>(promise: Promise<TResult>) : Promise<{ok: b
     }
 }
 
+export async function assertOk<T>(promise: Promise<T>): Promise<T> {
+    try {
+        return await promise;
+    } catch (err) {
+        if (hasStackTrace(err)) {
+            const trace: {stack?: string} = {};
+            Error.captureStackTrace(trace);
+            err.stack = `${err.stack}\nCaused by: ${trace.stack}`;
+        }
+        throw err;
+    }
+}
+
 export function isHttpError(err?: unknown): err is HTTPError {
     return err && Object.prototype.hasOwnProperty.call(err, "response");
+}
+
+export function hasStackTrace(reason?: unknown): reason is {stack: unknown} {
+    return reason && Object.prototype.hasOwnProperty.call(reason, "stack");
 }