chore: change requestChecksumCalculation type to union

Author: trivikr

packages/middleware-flexible-checksums/src/configuration.ts

@@ -9,6 +9,8 @@ import {
   StreamHasher,
 } from "@smithy/types";
 
+import { RequestChecksumCalculation } from "./constants";
+
 export interface PreviouslyResolved {
   /**
    * The function that will be used to convert binary data to a base64-encoded string.
@@ -35,7 +37,7 @@ export interface PreviouslyResolved {
   /**
    * Determines when a checksum will be calculated for request payloads
    */
-  requestChecksumCalculation: Provider<string>;
+  requestChecksumCalculation: Provider<RequestChecksumCalculation>;
 
   /**
    * A constructor for a class implementing the {@link Hash} interface that computes SHA1 hashes.

packages/middleware-flexible-checksums/src/getChecksumAlgorithmForRequest.ts

@@ -20,7 +20,7 @@ export interface GetChecksumAlgorithmForRequestOptions {
   /**
    * Determines when a checksum will be calculated for request payloads
    */
-  requestChecksumCalculation: string;
+  requestChecksumCalculation: RequestChecksumCalculation;
 }
 
 /**