fix linting errors

Author: harry_squater

examples/src/chains/simple_sequential_chain.ts

@@ -35,6 +35,7 @@ const overallChain = new SimpleSequentialChain({
   verbose: true,
 });
 const review = await overallChain.run("Tragedy at sunset on the beach");
+console.log(review);
 /*
     variable review contains the generated play review based on the input title and synopsis generated in the first step:
 

langchain/src/chains/simple_sequential_chain.ts

@@ -53,8 +53,11 @@ export class SimpleSequentialChain
   implements SimpleSequentialChainInput
 {
   chains: Array<BaseChain>;
+
   inputKey = "input";
+
   outputKey = "output";
+
   trimOutputs: boolean;
 
   get inputKeys() {
@@ -87,7 +90,7 @@ export class SimpleSequentialChain
       if (this.trimOutputs) {
         input = input.trim();
       }
-      this.callbackManager.handleText(input, this.verbose);
+      await this.callbackManager.handleText(input, this.verbose);
     }
     return { [this.outputKey]: input };
   }