Use a delegate file writer for protocol gen

Author: kstich

smithy-typescript-codegen/src/main/java/software/amazon/smithy/typescript/codegen/CodegenVisitor.java

@@ -262,21 +262,20 @@ public Void serviceShape(ServiceShape shape) {
 
         if (protocolGenerator != null) {
             LOGGER.info("Generating serde for protocol " + protocolGenerator.getName() + " on " + shape.getId());
-            String fileRoot = "protocols/" + ProtocolGenerator.getSanitizedName(protocolGenerator.getName());
-            String namespace = "./" + fileRoot;
-            TypeScriptWriter writer = new TypeScriptWriter(namespace);
-            ProtocolGenerator.GenerationContext context = new ProtocolGenerator.GenerationContext();
-            context.setProtocolName(protocolGenerator.getName());
-            context.setIntegrations(integrations);
-            context.setModel(model);
-            context.setService(shape);
-            context.setSettings(settings);
-            context.setSymbolProvider(symbolProvider);
-            context.setWriter(writer);
-            protocolGenerator.generateRequestSerializers(context);
-            protocolGenerator.generateResponseDeserializers(context);
-            protocolGenerator.generateSharedComponents(context);
-            fileManifest.writeFile(fileRoot + ".ts", writer.toString());
+            String fileName = "protocols/" + ProtocolGenerator.getSanitizedName(protocolGenerator.getName()) + ".ts";
+            writers.useFileWriter(fileName, writer -> {
+                ProtocolGenerator.GenerationContext context = new ProtocolGenerator.GenerationContext();
+                context.setProtocolName(protocolGenerator.getName());
+                context.setIntegrations(integrations);
+                context.setModel(model);
+                context.setService(shape);
+                context.setSettings(settings);
+                context.setSymbolProvider(symbolProvider);
+                context.setWriter(writer);
+                protocolGenerator.generateRequestSerializers(context);
+                protocolGenerator.generateResponseDeserializers(context);
+                protocolGenerator.generateSharedComponents(context);
+            });
         }
 
         return null;

smithy-typescript-codegen/src/main/java/software/amazon/smithy/typescript/codegen/TypeScriptWriter.java

@@ -47,6 +47,9 @@
  * module paths against the moduleName of the writer. Module names that
  * start with anything other than "." (e.g., "@", "/", etc.) are never
  * relativized.
+ *
+ * <p>Dependencies introduced via a TypeScriptWriter are added to the package.json
+ * file if the writer is a part of the {@link TypeScriptDelegator} of the {@link CodegenVisitor}.
  */
 public final class TypeScriptWriter extends CodeWriter {
 
@@ -224,8 +227,8 @@ boolean writeMemberDocs(Model model, MemberShape member) {
     /**
      * Adds one or more dependencies to the generated code.
      *
-     * <p>The dependencies of all writers are merged together to eventually generate
-     * a package.json file.
+     * <p>The dependencies of all writers created by the {@link TypeScriptDelegator}
+     * are merged together to eventually generate a package.json file.
      *
      * @param dependencies TypeScriptDependency to add.
      * @return Returns the writer.