Propagate untranspilableFeatures suppression tag from stage1 to sta…

…ge2 during TypedAST serialize/deserialize

ReportUntranspilableFeatures pass will run in stage2 since it uses languageOut  information. It reports diagnostic {@code UNTRANSPILABLE_FEATURE_PRESENT} that can be supppressed using `untranspilableFeatures` suppression tag. Hence we must propagate those suppressions.

PiperOrigin-RevId: 549451459

src/com/google/javascript/jscomp/serialization/JSDocSerializer.java

@@ -160,6 +160,9 @@ public static JSDocInfo convertJSDocInfoForOptimizations(JSDocInfo jsdoc) {
     if (jsdoc.getSuppressions().contains("messageConventions")) {
       builder.addKind(JsdocTag.JSDOC_SUPPRESS_MESSAGE_CONVENTION);
     }
+    if (jsdoc.getSuppressions().contains("untranspilableFeatures")) {
+      builder.addKind(JsdocTag.JSDOC_SUPPRESS_UNTRANSPILABLE_FEATURES);
+    }
 
     OptimizationJsdoc result = builder.build();
     if (OptimizationJsdoc.getDefaultInstance().equals(result)) {
@@ -320,6 +323,15 @@ private static JSTypeExpression createPlaceholderType() {
           suppressions.add("messageConventions");
           continue;
 
+          // ReportUntranspilableFeatures pass will run in stage2 since it uses languageOut
+          // information. It reports diagnostic {@code UNTRANSPILABLE_FEATURE_PRESENT} that can be
+          // supppressed using `untranspilableFeatures` suppression tag.
+          // Hence we must propagate it.
+        case JSDOC_SUPPRESS_UNTRANSPILABLE_FEATURES:
+          suppressions = (suppressions != null ? suppressions : new TreeSet<>());
+          suppressions.add("untranspilableFeatures");
+          continue;
+
         case JSDOC_FILEOVERVIEW:
           builder.recordFileOverview("");
           continue;

src/com/google/javascript/rhino/typed_ast/optimization_jsdoc.proto

@@ -73,4 +73,7 @@ enum JsdocTag {
 
   // Used to identify Sass generated css (.css.closure.js) files.
   JSDOC_SASS_GENERATED_CSS_TS = 34;
+
+  // Used to suppress warnings by ReportUntranspilableFeatures pass in stage2
+  JSDOC_SUPPRESS_UNTRANSPILABLE_FEATURES = 36;
 }