Merge pull request #28269 from patrick91/master

Fix evaporate stringToSign type

types/evaporate/index.d.ts

@@ -52,7 +52,7 @@ declare namespace Evaporate {
         customAuthMethod?: null | ((
             signParams: string,
             signHeaders: string,
-            stringToSign: () => string | undefined,
+            stringToSign: string,
             signatureDateTime: string,
             canonicalRequest: string
         ) => Promise<string>);