Log unknown union member as 'UNKNOWN'

Author: trivikr

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

@@ -115,7 +115,7 @@
  *     if (obj.bear !== undefined)
  *       return { bear: Bear.filterSensitiveLog(obj.bear) };
  *     if (obj.$unknown !== undefined)
- *       return { [obj.$unknown[0]]: obj.$unknown[1] };
+ *       return { [obj.$unknown[0]]: 'UNKNOWN' };
  *   }
  * }
  * }</pre>
@@ -270,7 +270,7 @@ private void writeFilterSensitiveLog() {
                         writer.write("};");
                     }
                 }
-                writer.write("if (${1L}.$$unknown !== undefined) return {[${1L}.$$unknown[0]]: ${1L}.$$unknown[1]};",
+                writer.write("if (${1L}.$$unknown !== undefined) return {[${1L}.$$unknown[0]]: 'UNKNOWN'};",
                     objectParam);
             }
         );

smithy-typescript-codegen/src/test/java/software/amazon/smithy/typescript/codegen/StructureGeneratorTest.java

@@ -154,7 +154,7 @@ public void callsFilterInUnionWithSensitiveData() {
                                 "  export const filterSensitiveLog = (obj: TestUnion): any => {\n"
                                 + "    if (obj.bar !== undefined) return {bar: obj.bar};\n"
                                 + "    if (obj.sensitiveBar !== undefined) return {[sensitiveBar]: SENSITIVE_STRING};\n"
-                                + "    if (obj.$unknown !== undefined) return {[obj.$unknown[0]]: obj.$unknown[1]};\n"
+                                + "    if (obj.$unknown !== undefined) return {[obj.$unknown[0]]: 'UNKNOWN'};\n"
                                 + "  }\n");
     }
 
@@ -175,7 +175,7 @@ public void callsFilterInUnionWithoutSensitiveData() {
                                 "  export const filterSensitiveLog = (obj: TestUnion): any => {\n"
                                 + "    if (obj.fooString !== undefined) return {fooString: obj.fooString};\n"
                                 + "    if (obj.barString !== undefined) return {barString: obj.barString};\n"
-                                + "    if (obj.$unknown !== undefined) return {[obj.$unknown[0]]: obj.$unknown[1]};\n"
+                                + "    if (obj.$unknown !== undefined) return {[obj.$unknown[0]]: 'UNKNOWN'};\n"
                                 + "  }\n");
     }
 
@@ -257,7 +257,7 @@ public void callsFilterInListWithUnionWithSensitiveData() {
                                 "  export const filterSensitiveLog = (obj: TestUnion): any => {\n"
                                 + "    if (obj.bar !== undefined) return {bar: obj.bar};\n"
                                 + "    if (obj.sensitiveBar !== undefined) return {[sensitiveBar]: SENSITIVE_STRING};\n"
-                                + "    if (obj.$unknown !== undefined) return {[obj.$unknown[0]]: obj.$unknown[1]};\n"
+                                + "    if (obj.$unknown !== undefined) return {[obj.$unknown[0]]: 'UNKNOWN'};\n"
                                 + "  }\n");
     }
 
@@ -351,7 +351,7 @@ public void callsFilterInMapWithUnionWithSensitiveData() {
                             "  export const filterSensitiveLog = (obj: TestUnion): any => {\n"
                             + "    if (obj.bar !== undefined) return {bar: obj.bar};\n"
                             + "    if (obj.sensitiveBar !== undefined) return {[sensitiveBar]: SENSITIVE_STRING};\n"
-                            + "    if (obj.$unknown !== undefined) return {[obj.$unknown[0]]: obj.$unknown[1]};\n"
+                            + "    if (obj.$unknown !== undefined) return {[obj.$unknown[0]]: 'UNKNOWN'};\n"
                             + "  }\n");
     }