[JS] Add getFullyQualifiedName() (#6119)

This optionally generates a static `getFullyQualifiedName()` function to get
the fully-qualified name of a type in JavaScript and TypeScript in a similar
fashion to the C++ codegen.

tests/union_vector/union_vector_generated.h

@@ -202,6 +202,9 @@ FLATBUFFERS_MANUALLY_ALIGNED_STRUCT(4) Rapunzel FLATBUFFERS_FINAL_CLASS {
   static const flatbuffers::TypeTable *MiniReflectTypeTable() {
     return RapunzelTypeTable();
   }
+  static FLATBUFFERS_CONSTEXPR const char *GetFullyQualifiedName() {
+    return "Rapunzel";
+  }
   Rapunzel()
       : hair_length_(0) {
   }
@@ -235,6 +238,9 @@ FLATBUFFERS_MANUALLY_ALIGNED_STRUCT(4) BookReader FLATBUFFERS_FINAL_CLASS {
   static const flatbuffers::TypeTable *MiniReflectTypeTable() {
     return BookReaderTypeTable();
   }
+  static FLATBUFFERS_CONSTEXPR const char *GetFullyQualifiedName() {
+    return "BookReader";
+  }
   BookReader()
       : books_read_(0) {
   }
@@ -262,6 +268,9 @@ inline bool operator!=(const BookReader &lhs, const BookReader &rhs) {
 
 struct AttackerT : public flatbuffers::NativeTable {
   typedef Attacker TableType;
+  static FLATBUFFERS_CONSTEXPR const char *GetFullyQualifiedName() {
+    return "AttackerT";
+  }
   int32_t sword_attack_damage;
   AttackerT()
       : sword_attack_damage(0) {
@@ -284,6 +293,9 @@ struct Attacker FLATBUFFERS_FINAL_CLASS : private flatbuffers::Table {
   static const flatbuffers::TypeTable *MiniReflectTypeTable() {
     return AttackerTypeTable();
   }
+  static FLATBUFFERS_CONSTEXPR const char *GetFullyQualifiedName() {
+    return "Attacker";
+  }
   enum FlatBuffersVTableOffset FLATBUFFERS_VTABLE_UNDERLYING_TYPE {
     VT_SWORD_ATTACK_DAMAGE = 4
   };
@@ -333,6 +345,9 @@ flatbuffers::Offset<Attacker> CreateAttacker(flatbuffers::FlatBufferBuilder &_fb
 
 struct MovieT : public flatbuffers::NativeTable {
   typedef Movie TableType;
+  static FLATBUFFERS_CONSTEXPR const char *GetFullyQualifiedName() {
+    return "MovieT";
+  }
   CharacterUnion main_character;
   std::vector<CharacterUnion> characters;
   MovieT() {
@@ -356,6 +371,9 @@ struct Movie FLATBUFFERS_FINAL_CLASS : private flatbuffers::Table {
   static const flatbuffers::TypeTable *MiniReflectTypeTable() {
     return MovieTypeTable();
   }
+  static FLATBUFFERS_CONSTEXPR const char *GetFullyQualifiedName() {
+    return "Movie";
+  }
   enum FlatBuffersVTableOffset FLATBUFFERS_VTABLE_UNDERLYING_TYPE {
     VT_MAIN_CHARACTER_TYPE = 4,
     VT_MAIN_CHARACTER = 6,

tests/union_vector/union_vector_generated.js

@@ -94,6 +94,13 @@ Attacker.prototype.mutate_sword_attack_damage = function(value) {
   return true;
 };
 
+/**
+ * @returns {string}
+ */
+Attacker.getFullyQualifiedName = function() {
+  return 'Attacker';
+}
+
 /**
  * @param {flatbuffers.Builder} builder
  */
@@ -171,6 +178,13 @@ Rapunzel.prototype.mutate_hair_length = function(value) {
   return true;
 };
 
+/**
+ * @returns {string}
+ */
+Rapunzel.getFullyQualifiedName = function() {
+  return 'Rapunzel';
+}
+
 /**
  * @param {flatbuffers.Builder} builder
  * @param {number} hair_length
@@ -224,6 +238,13 @@ BookReader.prototype.mutate_books_read = function(value) {
   return true;
 };
 
+/**
+ * @returns {string}
+ */
+BookReader.getFullyQualifiedName = function() {
+  return 'BookReader';
+}
+
 /**
  * @param {flatbuffers.Builder} builder
  * @param {number} books_read
@@ -348,6 +369,13 @@ Movie.prototype.charactersLength = function() {
   return offset ? this.bb.__vector_len(this.bb_pos + offset) : 0;
 };
 
+/**
+ * @returns {string}
+ */
+Movie.getFullyQualifiedName = function() {
+  return 'Movie';
+}
+
 /**
  * @param {flatbuffers.Builder} builder
  */

tests/union_vector/union_vector_generated.ts

@@ -107,6 +107,13 @@ mutate_sword_attack_damage(value:number):boolean {
   return true;
 };
 
+/**
+ * @returns string
+ */
+static getFullyQualifiedName():string {
+  return 'Attacker';
+}
+
 /**
  * @param flatbuffers.Builder builder
  */
@@ -207,6 +214,13 @@ mutate_hair_length(value:number):boolean {
   return true;
 };
 
+/**
+ * @returns string
+ */
+static getFullyQualifiedName():string {
+  return 'Rapunzel';
+}
+
 /**
  * @param flatbuffers.Builder builder
  * @param number hair_length
@@ -289,6 +303,13 @@ mutate_books_read(value:number):boolean {
   return true;
 };
 
+/**
+ * @returns string
+ */
+static getFullyQualifiedName():string {
+  return 'BookReader';
+}
+
 /**
  * @param flatbuffers.Builder builder
  * @param number books_read
@@ -442,6 +463,13 @@ charactersLength():number {
   return offset ? this.bb!.__vector_len(this.bb_pos + offset) : 0;
 };
 
+/**
+ * @returns string
+ */
+static getFullyQualifiedName():string {
+  return 'Movie';
+}
+
 /**
  * @param flatbuffers.Builder builder
  */