Force deletion of old versions. Aliases can easily be rolled back thr…

…ough S3.

lib/aliasRestructureStack.js

@@ -100,7 +100,7 @@ module.exports = {
 
 				const functionName = _.replace(_.get(version, 'Properties.FunctionName.Ref'), /LambdaFunction$/, '');
 
-				// Remove the function export
+				// Remove the function version export
 				delete stageStack.Outputs[`${functionName}LambdaFunctionQualifiedArn`];
 
 				// Add function Arn export to stage stack
@@ -114,6 +114,8 @@ module.exports = {
 
 				// Reference correct function name in version
 				version.Properties.FunctionName = { 'Fn::ImportValue': `${stackName}-${functionName}-LambdaFunctionArn` };
+				// With alias support we do not want to retain the versions
+				version.DeletionPolicy = 'Delete';
 
 				// Add alias to alias stack. Reference the version export in the stage stack
 				// to prevent version deletion.