types for run, and maybe omit from stack trace

Author: ianmacartney

src/client/stepContext.ts

@@ -101,18 +101,15 @@ export class StepContext implements WorkflowStep {
     });
   }
 
-  private async run(
-    req: Omit<StepRequest, "resolve" | "reject">,
-  ): Promise<unknown> {
-    let send: unknown;
+  private run(req: Omit<StepRequest, "resolve" | "reject">): Promise<unknown> {
+    let send: Promise<void>;
     const p = new Promise<unknown>((resolve, reject) => {
       send = this.sender.push({
         ...req,
         resolve,
         reject,
       });
     });
-    await send;
-    return p;
+    return send!.then(() => p);
   }
 }