feat(typescript_indexer): add ref/id from constructor calls to class …

…nodes (#5534)

kythe/typescript/indexer.ts

@@ -2375,6 +2375,16 @@ class Visitor {
     if (refType == RefType.WRITE || refType == RefType.READ_WRITE) {
       this.emitEdge(anchor, EdgeKind.REF_WRITES, name);
     }
+    // For classes emit ref/id to the type node in addition to regular
+    // ref. When user check refs for a class - they usually check get
+    // refs of the class node, not the constructor node. That's why
+    // we need ref/id from all usages to the class node.
+    if (sym.flags & ts.SymbolFlags.Class) {
+      const className = this.host.getSymbolName(sym, TSNamespace.TYPE);
+      if (className != null) {
+        this.emitEdge(anchor, EdgeKind.REF_ID, className);
+      }
+    }
     this.addInfluencer(name);
   }
 

kythe/typescript/testdata/class.ts

@@ -94,10 +94,15 @@ class SubSubclass extends Class implements IExtended {
 }
 
 //- @Class ref ClassValue
+//- @Class ref/id Class
 let instance = new Class(3, 'a');
 //- @otherMember ref OtherMember
 instance.otherMember;
 
 // Using Class in type position should still create a link to the class.
 //- @Class ref Class
 let useAsType: Class = instance;
+
+//- @Class ref ClassValue
+//- @Class ref/id Class
+Class;