change Promise<unknown> to Promise<never>

Author: kuhe

smithy-typescript-codegen/src/main/java/software/amazon/smithy/typescript/codegen/integration/HttpBindingProtocolGenerator.java

@@ -2121,7 +2121,7 @@ private void generateOperationResponseDeserializer(
             // status code that's not the modeled code (300 or higher). This allows for
             // returning other 2XX codes that don't match the defined value.
             writer.openBlock("if (output.statusCode !== $L && output.statusCode >= 300) {", "}", trait.getCode(),
-                    () -> writer.write("return $L(output, context) as any;", errorMethodName));
+                    () -> writer.write("return $L(output, context);", errorMethodName));
 
             // Start deserializing the response.
             writer.openBlock("const contents: any = map({", "});", () -> {

smithy-typescript-codegen/src/main/java/software/amazon/smithy/typescript/codegen/integration/HttpProtocolGeneratorUtils.java

@@ -332,7 +332,7 @@ static Set<StructureShape> generateUnifiedErrorDispatcher(
         writer.openBlock("const $L = async(\n"
             + "  output: $T,\n"
             + "  context: __SerdeContext,\n"
-            + "): Promise<unknown> => {", "}", errorMethodName, responseType, () -> {
+            + "): Promise<never> => {", "}", errorMethodName, responseType, () -> {
             // Prepare error response for parsing error code. If error code needs to be parsed from response body
             // then we collect body and parse it to JS object, otherwise leave the response body as is.
             if (shouldParseErrorBody) {

smithy-typescript-codegen/src/main/java/software/amazon/smithy/typescript/codegen/integration/HttpRpcProtocolGenerator.java

@@ -461,7 +461,7 @@ private void generateOperationDeserializer(GenerationContext context, OperationS
                        + "): Promise<$T> => {", "}", methodName, responseType, serdeContextType, outputType, () -> {
             // Redirect error deserialization to the dispatcher
             writer.openBlock("if (output.statusCode >= 300) {", "}", () -> {
-                writer.write("return $L(output, context) as any;", errorMethodName);
+                writer.write("return $L(output, context);", errorMethodName);
             });
 
             // Start deserializing the response.