adds runtime config

Author: Chase Coalwell

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

@@ -232,9 +232,12 @@ private void generateClientDefaults() {
             writer.writeDocs("The function that will be used to convert binary data to a UTF-8 encoded string");
             writer.write("utf8Encoder?: __Encoder;\n");
 
-            writer.writeDocs("The function that will be used to populate default value in 'User-Agent' header");
+            writer.writeDocs("The string that will be used to populate default value in 'User-Agent' header");
             writer.write("defaultUserAgent?: string;\n");
 
+            writer.writeDocs("The runtime environment");
+            writer.write("runtime?: string;\n");
+
             // Write custom configuration dependencies.
             for (TypeScriptIntegration integration : integrations) {
                 integration.addConfigInterfaceFields(settings, model, symbolProvider, writer);

smithy-typescript-codegen/src/main/resources/software/amazon/smithy/typescript/codegen/runtimeConfig.browser.ts.template

@@ -22,5 +22,6 @@ export const ClientDefaultValues: Required<ClientDefaults> = {
   utf8Decoder: fromUtf8,
   utf8Encoder: toUtf8,
   defaultUserAgent: defaultUserAgent(name, version),
+  runtime: "browser",
 ${customizations}
 };

smithy-typescript-codegen/src/main/resources/software/amazon/smithy/typescript/codegen/runtimeConfig.ts.template

@@ -22,5 +22,6 @@ export const ClientDefaultValues: Required<ClientDefaults> = {
   utf8Decoder: fromUtf8,
   utf8Encoder: toUtf8,
   defaultUserAgent: defaultUserAgent(name, version),
+  runtime: "node",
 ${customizations}
 };