[JS/TS] Size prefix support (#5326)

* WIP size prefix support

* Consider size prefix in overloaded variant

* Work on code gen

* Disabled helper functions in code gen

* Enabled helper functions in code gen

* Fix size prefixed test

* Fix bad function call

* Add SIZE_PREFIX_LENGTH

* Fix review comments

js/flatbuffers.js

@@ -48,6 +48,12 @@ flatbuffers.SIZEOF_INT = 4;
  */
 flatbuffers.FILE_IDENTIFIER_LENGTH = 4;
 
+/**
+ * @type {number}
+ * @const
+ */
+flatbuffers.SIZE_PREFIX_LENGTH = 4;
+
 /**
  * @enum {number}
  */
@@ -676,12 +682,14 @@ outer_loop:
  *
  * @param {flatbuffers.Offset} root_table
  * @param {string=} opt_file_identifier
+ * @param {boolean=} opt_size_prefix
  */
-flatbuffers.Builder.prototype.finish = function(root_table, opt_file_identifier) {
+flatbuffers.Builder.prototype.finish = function(root_table, opt_file_identifier, opt_size_prefix) {
+  var size_prefix = opt_size_prefix ? flatbuffers.SIZE_PREFIX_LENGTH : 0;
   if (opt_file_identifier) {
     var file_identifier = opt_file_identifier;
     this.prep(this.minalign, flatbuffers.SIZEOF_INT +
-      flatbuffers.FILE_IDENTIFIER_LENGTH);
+      flatbuffers.FILE_IDENTIFIER_LENGTH + size_prefix);
     if (file_identifier.length != flatbuffers.FILE_IDENTIFIER_LENGTH) {
       throw new Error('FlatBuffers: file identifier must be length ' +
         flatbuffers.FILE_IDENTIFIER_LENGTH);
@@ -690,11 +698,24 @@ flatbuffers.Builder.prototype.finish = function(root_table, opt_file_identifier)
       this.writeInt8(file_identifier.charCodeAt(i));
     }
   }
-  this.prep(this.minalign, flatbuffers.SIZEOF_INT);
+  this.prep(this.minalign, flatbuffers.SIZEOF_INT + size_prefix);
   this.addOffset(root_table);
+  if (size_prefix) {
+    this.addInt32(this.bb.capacity() - this.space);
+  }
   this.bb.setPosition(this.space);
 };
 
+/**
+ * Finalize a size prefixed buffer, pointing to the given `root_table`.
+ *
+ * @param {flatbuffers.Offset} root_table
+ * @param {string=} opt_file_identifier
+ */
+flatbuffers.Builder.prototype.finishSizePrefixed = function (root_table, opt_file_identifier) {
+  this.finish(root_table, opt_file_identifier, true);
+};
+
 /// @cond FLATBUFFERS_INTERNAL
 /**
  * This checks a required field has been set in a given table that has

src/idl_gen_js_ts.cpp

@@ -604,6 +604,62 @@ class JsTsGenerator : public BaseGenerator {
     }
   }
 
+  void GenerateRootAccessor(StructDef &struct_def, std::string *code_ptr,
+                 std::string &code, std::string &object_name, bool size_prefixed) {
+    if (!struct_def.fixed) {
+      GenDocComment(code_ptr,
+                    GenTypeAnnotation(kParam, "flatbuffers.ByteBuffer", "bb") +
+                        GenTypeAnnotation(kParam, object_name + "=", "obj") +
+                        GenTypeAnnotation(kReturns, object_name, "", false));
+      std::string sizePrefixed("SizePrefixed");
+      if (lang_.language == IDLOptions::kTs) {
+        code += "static get" + (size_prefixed ? sizePrefixed : "") + "Root" + Verbose(struct_def, "As");
+        code += "(bb:flatbuffers.ByteBuffer, obj?:" + object_name +
+                "):" + object_name + " {\n";
+      } else {
+        code += object_name + ".get" + (size_prefixed ? sizePrefixed : "") + "Root" + Verbose(struct_def, "As");
+        code += " = function(bb, obj) {\n";
+      }
+      code += "  return (obj || new " + object_name;
+      code += ").__init(bb.readInt32(bb.position()) + bb.position(), bb);\n";
+      code += "};\n\n";
+    }
+  }
+
+  void GenerateFinisher(StructDef &struct_def, std::string *code_ptr,
+                 std::string &code, std::string &object_name, bool size_prefixed) {
+    if (parser_.root_struct_def_ == &struct_def) {
+      std::string sizePrefixed("SizePrefixed");
+      GenDocComment(
+          code_ptr,
+          GenTypeAnnotation(kParam, "flatbuffers.Builder", "builder") +
+              GenTypeAnnotation(kParam, "flatbuffers.Offset", "offset",
+                                false));
+
+      if (lang_.language == IDLOptions::kTs) {
+        code += "static finish" + (size_prefixed ? sizePrefixed : "") + Verbose(struct_def) + "Buffer";
+        code +=
+            "(builder:flatbuffers.Builder, offset:flatbuffers.Offset) {\n";
+      } else {
+        code += object_name + ".finish" + (size_prefixed ? sizePrefixed : "") + Verbose(struct_def) + "Buffer";
+        code += " = function(builder, offset) {\n";
+      }
+
+      code += "  builder.finish(offset";
+      if (!parser_.file_identifier_.empty()) {
+        code += ", '" + parser_.file_identifier_ + "'";
+      }
+      if (size_prefixed) {
+        if (parser_.file_identifier_.empty()) {
+          code += ", undefined";
+        }
+        code += ", true";
+      }
+      code += ");\n";
+      code += "};\n\n";
+    }
+  }
+
   // Generate an accessor struct with constructor for a flatbuffers struct.
   void GenStruct(const Parser &parser, StructDef &struct_def,
                  std::string *code_ptr, std::string *exports_ptr,
@@ -688,27 +744,13 @@ class JsTsGenerator : public BaseGenerator {
     code += "  return this;\n";
     code += "};\n\n";
 
-    // Generate a special accessor for the table that when used as the root of a
+    // Generate special accessors for the table that when used as the root of a
     // FlatBuffer
-    if (!struct_def.fixed) {
-      GenDocComment(code_ptr,
-                    GenTypeAnnotation(kParam, "flatbuffers.ByteBuffer", "bb") +
-                        GenTypeAnnotation(kParam, object_name + "=", "obj") +
-                        GenTypeAnnotation(kReturns, object_name, "", false));
-      if (lang_.language == IDLOptions::kTs) {
-        code += "static getRoot" + Verbose(struct_def, "As");
-        code += "(bb:flatbuffers.ByteBuffer, obj?:" + object_name +
-                "):" + object_name + " {\n";
-      } else {
-        code += object_name + ".getRoot" + Verbose(struct_def, "As");
-        code += " = function(bb, obj) {\n";
-      }
-      code += "  return (obj || new " + object_name;
-      code += ").__init(bb.readInt32(bb.position()) + bb.position(), bb);\n";
-      code += "};\n\n";
+    GenerateRootAccessor(struct_def, code_ptr, code, object_name, false);
+    GenerateRootAccessor(struct_def, code_ptr, code, object_name, true);
 
     // Generate the identifier check method
-      if (parser_.root_struct_def_ == &struct_def &&
+    if (!struct_def.fixed && parser_.root_struct_def_ == &struct_def &&
         !parser_.file_identifier_.empty()) {
       GenDocComment(
           code_ptr,
@@ -725,7 +767,6 @@ class JsTsGenerator : public BaseGenerator {
       code += "  return bb.__has_identifier('" + parser_.file_identifier_;
       code += "');\n};\n\n";
     }
-    }
 
     // Emit field accessors
     for (auto it = struct_def.fields.vec.begin();
@@ -1238,30 +1279,9 @@ class JsTsGenerator : public BaseGenerator {
       code += "  return offset;\n";
       code += "};\n\n";
 
-      // Generate the method to complete buffer construction
-      if (parser_.root_struct_def_ == &struct_def) {
-        GenDocComment(
-            code_ptr,
-            GenTypeAnnotation(kParam, "flatbuffers.Builder", "builder") +
-                GenTypeAnnotation(kParam, "flatbuffers.Offset", "offset",
-                                  false));
-
-        if (lang_.language == IDLOptions::kTs) {
-          code += "static finish" + Verbose(struct_def) + "Buffer";
-          code +=
-              "(builder:flatbuffers.Builder, offset:flatbuffers.Offset) {\n";
-        } else {
-          code += object_name + ".finish" + Verbose(struct_def) + "Buffer";
-          code += " = function(builder, offset) {\n";
-        }
-
-        code += "  builder.finish(offset";
-        if (!parser_.file_identifier_.empty()) {
-          code += ", '" + parser_.file_identifier_ + "'";
-        }
-        code += ");\n";
-        code += "};\n\n";
-      }
+      // Generate the methods to complete buffer construction
+      GenerateFinisher(struct_def, code_ptr, code, object_name, false);
+      GenerateFinisher(struct_def, code_ptr, code, object_name, true);
 
       // Generate a convenient CreateX function
       if (lang_.language == IDLOptions::kJs) {

tests/JavaScriptTest.js

@@ -246,8 +246,10 @@ function testUnicode() {
   MyGame.Example.Monster.addTestarrayofstring(fbb, testarrayofstringOffset);
   MyGame.Example.Monster.addTestarrayoftables(fbb, testarrayoftablesOffset);
   MyGame.Example.Monster.addName(fbb, name);
-  MyGame.Example.Monster.finishMonsterBuffer(fbb, MyGame.Example.Monster.endMonster(fbb));
-  testReadingUnicode(new flatbuffers.ByteBuffer(fbb.asUint8Array()));
+  MyGame.Example.Monster.finishSizePrefixedMonsterBuffer(fbb, MyGame.Example.Monster.endMonster(fbb));
+  var bb = new flatbuffers.ByteBuffer(fbb.asUint8Array())
+  bb.setPosition(4);
+  testReadingUnicode(bb);
 }
 
 var __imul = Math.imul ? Math.imul : function(a, b) {

tests/monster_test_generated.js

@@ -137,6 +137,15 @@ MyGame.InParentNamespace.getRootAsInParentNamespace = function(bb, obj) {
   return (obj || new MyGame.InParentNamespace).__init(bb.readInt32(bb.position()) + bb.position(), bb);
 };
 
+/**
+ * @param {flatbuffers.ByteBuffer} bb
+ * @param {MyGame.InParentNamespace=} obj
+ * @returns {MyGame.InParentNamespace}
+ */
+MyGame.InParentNamespace.getSizePrefixedRootAsInParentNamespace = function(bb, obj) {
+  return (obj || new MyGame.InParentNamespace).__init(bb.readInt32(bb.position()) + bb.position(), bb);
+};
+
 /**
  * @param {flatbuffers.Builder} builder
  */
@@ -197,6 +206,15 @@ MyGame.Example2.Monster.getRootAsMonster = function(bb, obj) {
   return (obj || new MyGame.Example2.Monster).__init(bb.readInt32(bb.position()) + bb.position(), bb);
 };
 
+/**
+ * @param {flatbuffers.ByteBuffer} bb
+ * @param {MyGame.Example2.Monster=} obj
+ * @returns {MyGame.Example2.Monster}
+ */
+MyGame.Example2.Monster.getSizePrefixedRootAsMonster = function(bb, obj) {
+  return (obj || new MyGame.Example2.Monster).__init(bb.readInt32(bb.position()) + bb.position(), bb);
+};
+
 /**
  * @param {flatbuffers.Builder} builder
  */
@@ -341,6 +359,15 @@ MyGame.Example.TestSimpleTableWithEnum.getRootAsTestSimpleTableWithEnum = functi
   return (obj || new MyGame.Example.TestSimpleTableWithEnum).__init(bb.readInt32(bb.position()) + bb.position(), bb);
 };
 
+/**
+ * @param {flatbuffers.ByteBuffer} bb
+ * @param {MyGame.Example.TestSimpleTableWithEnum=} obj
+ * @returns {MyGame.Example.TestSimpleTableWithEnum}
+ */
+MyGame.Example.TestSimpleTableWithEnum.getSizePrefixedRootAsTestSimpleTableWithEnum = function(bb, obj) {
+  return (obj || new MyGame.Example.TestSimpleTableWithEnum).__init(bb.readInt32(bb.position()) + bb.position(), bb);
+};
+
 /**
  * @returns {MyGame.Example.Color}
  */
@@ -689,6 +716,15 @@ MyGame.Example.Stat.getRootAsStat = function(bb, obj) {
   return (obj || new MyGame.Example.Stat).__init(bb.readInt32(bb.position()) + bb.position(), bb);
 };
 
+/**
+ * @param {flatbuffers.ByteBuffer} bb
+ * @param {MyGame.Example.Stat=} obj
+ * @returns {MyGame.Example.Stat}
+ */
+MyGame.Example.Stat.getSizePrefixedRootAsStat = function(bb, obj) {
+  return (obj || new MyGame.Example.Stat).__init(bb.readInt32(bb.position()) + bb.position(), bb);
+};
+
 /**
  * @param {flatbuffers.Encoding=} optionalEncoding
  * @returns {string|Uint8Array|null}
@@ -834,6 +870,15 @@ MyGame.Example.Referrable.getRootAsReferrable = function(bb, obj) {
   return (obj || new MyGame.Example.Referrable).__init(bb.readInt32(bb.position()) + bb.position(), bb);
 };
 
+/**
+ * @param {flatbuffers.ByteBuffer} bb
+ * @param {MyGame.Example.Referrable=} obj
+ * @returns {MyGame.Example.Referrable}
+ */
+MyGame.Example.Referrable.getSizePrefixedRootAsReferrable = function(bb, obj) {
+  return (obj || new MyGame.Example.Referrable).__init(bb.readInt32(bb.position()) + bb.position(), bb);
+};
+
 /**
  * @returns {flatbuffers.Long}
  */
@@ -929,6 +974,15 @@ MyGame.Example.Monster.getRootAsMonster = function(bb, obj) {
   return (obj || new MyGame.Example.Monster).__init(bb.readInt32(bb.position()) + bb.position(), bb);
 };
 
+/**
+ * @param {flatbuffers.ByteBuffer} bb
+ * @param {MyGame.Example.Monster=} obj
+ * @returns {MyGame.Example.Monster}
+ */
+MyGame.Example.Monster.getSizePrefixedRootAsMonster = function(bb, obj) {
+  return (obj || new MyGame.Example.Monster).__init(bb.readInt32(bb.position()) + bb.position(), bb);
+};
+
 /**
  * @param {flatbuffers.ByteBuffer} bb
  * @returns {boolean}
@@ -2597,6 +2651,14 @@ MyGame.Example.Monster.finishMonsterBuffer = function(builder, offset) {
   builder.finish(offset, 'MONS');
 };
 
+/**
+ * @param {flatbuffers.Builder} builder
+ * @param {flatbuffers.Offset} offset
+ */
+MyGame.Example.Monster.finishSizePrefixedMonsterBuffer = function(builder, offset) {
+  builder.finish(offset, 'MONS', true);
+};
+
 /**
  * @param {flatbuffers.Builder} builder
  * @param {flatbuffers.Offset} posOffset
@@ -2735,6 +2797,15 @@ MyGame.Example.TypeAliases.getRootAsTypeAliases = function(bb, obj) {
   return (obj || new MyGame.Example.TypeAliases).__init(bb.readInt32(bb.position()) + bb.position(), bb);
 };
 
+/**
+ * @param {flatbuffers.ByteBuffer} bb
+ * @param {MyGame.Example.TypeAliases=} obj
+ * @returns {MyGame.Example.TypeAliases}
+ */
+MyGame.Example.TypeAliases.getSizePrefixedRootAsTypeAliases = function(bb, obj) {
+  return (obj || new MyGame.Example.TypeAliases).__init(bb.readInt32(bb.position()) + bb.position(), bb);
+};
+
 /**
  * @returns {number}
  */

tests/monster_test_generated.ts

@@ -71,6 +71,15 @@ static getRootAsInParentNamespace(bb:flatbuffers.ByteBuffer, obj?:InParentNamesp
   return (obj || new InParentNamespace).__init(bb.readInt32(bb.position()) + bb.position(), bb);
 };
 
+/**
+ * @param flatbuffers.ByteBuffer bb
+ * @param InParentNamespace= obj
+ * @returns InParentNamespace
+ */
+static getSizePrefixedRootAsInParentNamespace(bb:flatbuffers.ByteBuffer, obj?:InParentNamespace):InParentNamespace {
+  return (obj || new InParentNamespace).__init(bb.readInt32(bb.position()) + bb.position(), bb);
+};
+
 /**
  * @param flatbuffers.Builder builder
  */
@@ -121,6 +130,15 @@ static getRootAsMonster(bb:flatbuffers.ByteBuffer, obj?:Monster):Monster {
   return (obj || new Monster).__init(bb.readInt32(bb.position()) + bb.position(), bb);
 };
 
+/**
+ * @param flatbuffers.ByteBuffer bb
+ * @param Monster= obj
+ * @returns Monster
+ */
+static getSizePrefixedRootAsMonster(bb:flatbuffers.ByteBuffer, obj?:Monster):Monster {
+  return (obj || new Monster).__init(bb.readInt32(bb.position()) + bb.position(), bb);
+};
+
 /**
  * @param flatbuffers.Builder builder
  */
@@ -250,6 +268,15 @@ static getRootAsTestSimpleTableWithEnum(bb:flatbuffers.ByteBuffer, obj?:TestSimp
   return (obj || new TestSimpleTableWithEnum).__init(bb.readInt32(bb.position()) + bb.position(), bb);
 };
 
+/**
+ * @param flatbuffers.ByteBuffer bb
+ * @param TestSimpleTableWithEnum= obj
+ * @returns TestSimpleTableWithEnum
+ */
+static getSizePrefixedRootAsTestSimpleTableWithEnum(bb:flatbuffers.ByteBuffer, obj?:TestSimpleTableWithEnum):TestSimpleTableWithEnum {
+  return (obj || new TestSimpleTableWithEnum).__init(bb.readInt32(bb.position()) + bb.position(), bb);
+};
+
 /**
  * @returns MyGame.Example.Color
  */
@@ -577,6 +604,15 @@ static getRootAsStat(bb:flatbuffers.ByteBuffer, obj?:Stat):Stat {
   return (obj || new Stat).__init(bb.readInt32(bb.position()) + bb.position(), bb);
 };
 
+/**
+ * @param flatbuffers.ByteBuffer bb
+ * @param Stat= obj
+ * @returns Stat
+ */
+static getSizePrefixedRootAsStat(bb:flatbuffers.ByteBuffer, obj?:Stat):Stat {
+  return (obj || new Stat).__init(bb.readInt32(bb.position()) + bb.position(), bb);
+};
+
 /**
  * @param flatbuffers.Encoding= optionalEncoding
  * @returns string|Uint8Array|null
@@ -711,6 +747,15 @@ static getRootAsReferrable(bb:flatbuffers.ByteBuffer, obj?:Referrable):Referrabl
   return (obj || new Referrable).__init(bb.readInt32(bb.position()) + bb.position(), bb);
 };
 
+/**
+ * @param flatbuffers.ByteBuffer bb
+ * @param Referrable= obj
+ * @returns Referrable
+ */
+static getSizePrefixedRootAsReferrable(bb:flatbuffers.ByteBuffer, obj?:Referrable):Referrable {
+  return (obj || new Referrable).__init(bb.readInt32(bb.position()) + bb.position(), bb);
+};
+
 /**
  * @returns flatbuffers.Long
  */
@@ -795,6 +840,15 @@ static getRootAsMonster(bb:flatbuffers.ByteBuffer, obj?:Monster):Monster {
   return (obj || new Monster).__init(bb.readInt32(bb.position()) + bb.position(), bb);
 };
 
+/**
+ * @param flatbuffers.ByteBuffer bb
+ * @param Monster= obj
+ * @returns Monster
+ */
+static getSizePrefixedRootAsMonster(bb:flatbuffers.ByteBuffer, obj?:Monster):Monster {
+  return (obj || new Monster).__init(bb.readInt32(bb.position()) + bb.position(), bb);
+};
+
 /**
  * @param flatbuffers.ByteBuffer bb
  * @returns boolean
@@ -2469,6 +2523,14 @@ static finishMonsterBuffer(builder:flatbuffers.Builder, offset:flatbuffers.Offse
   builder.finish(offset, 'MONS');
 };
 
+/**
+ * @param flatbuffers.Builder builder
+ * @param flatbuffers.Offset offset
+ */
+static finishSizePrefixedMonsterBuffer(builder:flatbuffers.Builder, offset:flatbuffers.Offset) {
+  builder.finish(offset, 'MONS', true);
+};
+
 static createMonster(builder:flatbuffers.Builder, posOffset:flatbuffers.Offset, mana:number, hp:number, nameOffset:flatbuffers.Offset, inventoryOffset:flatbuffers.Offset, color:MyGame.Example.Color, testType:MyGame.Example.Any, testOffset:flatbuffers.Offset, test4Offset:flatbuffers.Offset, testarrayofstringOffset:flatbuffers.Offset, testarrayoftablesOffset:flatbuffers.Offset, enemyOffset:flatbuffers.Offset, testnestedflatbufferOffset:flatbuffers.Offset, testemptyOffset:flatbuffers.Offset, testbool:boolean, testhashs32Fnv1:number, testhashu32Fnv1:number, testhashs64Fnv1:flatbuffers.Long, testhashu64Fnv1:flatbuffers.Long, testhashs32Fnv1a:number, testhashu32Fnv1a:number, testhashs64Fnv1a:flatbuffers.Long, testhashu64Fnv1a:flatbuffers.Long, testarrayofboolsOffset:flatbuffers.Offset, testf:number, testf2:number, testf3:number, testarrayofstring2Offset:flatbuffers.Offset, testarrayofsortedstructOffset:flatbuffers.Offset, flexOffset:flatbuffers.Offset, test5Offset:flatbuffers.Offset, vectorOfLongsOffset:flatbuffers.Offset, vectorOfDoublesOffset:flatbuffers.Offset, parentNamespaceTestOffset:flatbuffers.Offset, vectorOfReferrablesOffset:flatbuffers.Offset, singleWeakReference:flatbuffers.Long, vectorOfWeakReferencesOffset:flatbuffers.Offset, vectorOfStrongReferrablesOffset:flatbuffers.Offset, coOwningReference:flatbuffers.Long, vectorOfCoOwningReferencesOffset:flatbuffers.Offset, nonOwningReference:flatbuffers.Long, vectorOfNonOwningReferencesOffset:flatbuffers.Offset, anyUniqueType:MyGame.Example.AnyUniqueAliases, anyUniqueOffset:flatbuffers.Offset, anyAmbiguousType:MyGame.Example.AnyAmbiguousAliases, anyAmbiguousOffset:flatbuffers.Offset, vectorOfEnumsOffset:flatbuffers.Offset):flatbuffers.Offset {
   Monster.startMonster(builder);
   Monster.addPos(builder, posOffset);
@@ -2550,6 +2612,15 @@ static getRootAsTypeAliases(bb:flatbuffers.ByteBuffer, obj?:TypeAliases):TypeAli
   return (obj || new TypeAliases).__init(bb.readInt32(bb.position()) + bb.position(), bb);
 };
 
+/**
+ * @param flatbuffers.ByteBuffer bb
+ * @param TypeAliases= obj
+ * @returns TypeAliases
+ */
+static getSizePrefixedRootAsTypeAliases(bb:flatbuffers.ByteBuffer, obj?:TypeAliases):TypeAliases {
+  return (obj || new TypeAliases).__init(bb.readInt32(bb.position()) + bb.position(), bb);
+};
+
 /**
  * @returns number
  */

tests/namespace_test/namespace_test1_generated.js

@@ -65,6 +65,15 @@ NamespaceA.NamespaceB.TableInNestedNS.getRootAsTableInNestedNS = function(bb, ob
   return (obj || new NamespaceA.NamespaceB.TableInNestedNS).__init(bb.readInt32(bb.position()) + bb.position(), bb);
 };
 
+/**
+ * @param {flatbuffers.ByteBuffer} bb
+ * @param {NamespaceA.NamespaceB.TableInNestedNS=} obj
+ * @returns {NamespaceA.NamespaceB.TableInNestedNS}
+ */
+NamespaceA.NamespaceB.TableInNestedNS.getSizePrefixedRootAsTableInNestedNS = function(bb, obj) {
+  return (obj || new NamespaceA.NamespaceB.TableInNestedNS).__init(bb.readInt32(bb.position()) + bb.position(), bb);
+};
+
 /**
  * @returns {number}
  */

tests/namespace_test/namespace_test1_generated.ts

@@ -38,6 +38,15 @@ static getRootAsTableInNestedNS(bb:flatbuffers.ByteBuffer, obj?:TableInNestedNS)
   return (obj || new TableInNestedNS).__init(bb.readInt32(bb.position()) + bb.position(), bb);
 };
 
+/**
+ * @param flatbuffers.ByteBuffer bb
+ * @param TableInNestedNS= obj
+ * @returns TableInNestedNS
+ */
+static getSizePrefixedRootAsTableInNestedNS(bb:flatbuffers.ByteBuffer, obj?:TableInNestedNS):TableInNestedNS {
+  return (obj || new TableInNestedNS).__init(bb.readInt32(bb.position()) + bb.position(), bb);
+};
+
 /**
  * @returns number
  */

tests/namespace_test/namespace_test2_generated.js

@@ -53,6 +53,15 @@ NamespaceA.TableInFirstNS.getRootAsTableInFirstNS = function(bb, obj) {
   return (obj || new NamespaceA.TableInFirstNS).__init(bb.readInt32(bb.position()) + bb.position(), bb);
 };
 
+/**
+ * @param {flatbuffers.ByteBuffer} bb
+ * @param {NamespaceA.TableInFirstNS=} obj
+ * @returns {NamespaceA.TableInFirstNS}
+ */
+NamespaceA.TableInFirstNS.getSizePrefixedRootAsTableInFirstNS = function(bb, obj) {
+  return (obj || new NamespaceA.TableInFirstNS).__init(bb.readInt32(bb.position()) + bb.position(), bb);
+};
+
 /**
  * @param {NamespaceA.NamespaceB.TableInNestedNS=} obj
  * @returns {NamespaceA.NamespaceB.TableInNestedNS|null}
@@ -184,6 +193,15 @@ NamespaceC.TableInC.getRootAsTableInC = function(bb, obj) {
   return (obj || new NamespaceC.TableInC).__init(bb.readInt32(bb.position()) + bb.position(), bb);
 };
 
+/**
+ * @param {flatbuffers.ByteBuffer} bb
+ * @param {NamespaceC.TableInC=} obj
+ * @returns {NamespaceC.TableInC}
+ */
+NamespaceC.TableInC.getSizePrefixedRootAsTableInC = function(bb, obj) {
+  return (obj || new NamespaceC.TableInC).__init(bb.readInt32(bb.position()) + bb.position(), bb);
+};
+
 /**
  * @param {NamespaceA.TableInFirstNS=} obj
  * @returns {NamespaceA.TableInFirstNS|null}
@@ -282,6 +300,15 @@ NamespaceA.SecondTableInA.getRootAsSecondTableInA = function(bb, obj) {
   return (obj || new NamespaceA.SecondTableInA).__init(bb.readInt32(bb.position()) + bb.position(), bb);
 };
 
+/**
+ * @param {flatbuffers.ByteBuffer} bb
+ * @param {NamespaceA.SecondTableInA=} obj
+ * @returns {NamespaceA.SecondTableInA}
+ */
+NamespaceA.SecondTableInA.getSizePrefixedRootAsSecondTableInA = function(bb, obj) {
+  return (obj || new NamespaceA.SecondTableInA).__init(bb.readInt32(bb.position()) + bb.position(), bb);
+};
+
 /**
  * @param {NamespaceC.TableInC=} obj
  * @returns {NamespaceC.TableInC|null}

tests/namespace_test/namespace_test2_generated.ts

@@ -29,6 +29,15 @@ static getRootAsTableInFirstNS(bb:flatbuffers.ByteBuffer, obj?:TableInFirstNS):T
   return (obj || new TableInFirstNS).__init(bb.readInt32(bb.position()) + bb.position(), bb);
 };
 
+/**
+ * @param flatbuffers.ByteBuffer bb
+ * @param TableInFirstNS= obj
+ * @returns TableInFirstNS
+ */
+static getSizePrefixedRootAsTableInFirstNS(bb:flatbuffers.ByteBuffer, obj?:TableInFirstNS):TableInFirstNS {
+  return (obj || new TableInFirstNS).__init(bb.readInt32(bb.position()) + bb.position(), bb);
+};
+
 /**
  * @param NamespaceA.NamespaceB.TableInNestedNS= obj
  * @returns NamespaceA.NamespaceB.TableInNestedNS|null
@@ -147,6 +156,15 @@ static getRootAsTableInC(bb:flatbuffers.ByteBuffer, obj?:TableInC):TableInC {
   return (obj || new TableInC).__init(bb.readInt32(bb.position()) + bb.position(), bb);
 };
 
+/**
+ * @param flatbuffers.ByteBuffer bb
+ * @param TableInC= obj
+ * @returns TableInC
+ */
+static getSizePrefixedRootAsTableInC(bb:flatbuffers.ByteBuffer, obj?:TableInC):TableInC {
+  return (obj || new TableInC).__init(bb.readInt32(bb.position()) + bb.position(), bb);
+};
+
 /**
  * @param NamespaceA.TableInFirstNS= obj
  * @returns NamespaceA.TableInFirstNS|null
@@ -233,6 +251,15 @@ static getRootAsSecondTableInA(bb:flatbuffers.ByteBuffer, obj?:SecondTableInA):S
   return (obj || new SecondTableInA).__init(bb.readInt32(bb.position()) + bb.position(), bb);
 };
 
+/**
+ * @param flatbuffers.ByteBuffer bb
+ * @param SecondTableInA= obj
+ * @returns SecondTableInA
+ */
+static getSizePrefixedRootAsSecondTableInA(bb:flatbuffers.ByteBuffer, obj?:SecondTableInA):SecondTableInA {
+  return (obj || new SecondTableInA).__init(bb.readInt32(bb.position()) + bb.position(), bb);
+};
+
 /**
  * @param NamespaceC.TableInC= obj
  * @returns NamespaceC.TableInC|null

tests/union_vector/union_vector_generated.js

@@ -61,6 +61,15 @@ Attacker.getRootAsAttacker = function(bb, obj) {
   return (obj || new Attacker).__init(bb.readInt32(bb.position()) + bb.position(), bb);
 };
 
+/**
+ * @param {flatbuffers.ByteBuffer} bb
+ * @param {Attacker=} obj
+ * @returns {Attacker}
+ */
+Attacker.getSizePrefixedRootAsAttacker = function(bb, obj) {
+  return (obj || new Attacker).__init(bb.readInt32(bb.position()) + bb.position(), bb);
+};
+
 /**
  * @returns {number}
  */
@@ -272,6 +281,15 @@ Movie.getRootAsMovie = function(bb, obj) {
   return (obj || new Movie).__init(bb.readInt32(bb.position()) + bb.position(), bb);
 };
 
+/**
+ * @param {flatbuffers.ByteBuffer} bb
+ * @param {Movie=} obj
+ * @returns {Movie}
+ */
+Movie.getSizePrefixedRootAsMovie = function(bb, obj) {
+  return (obj || new Movie).__init(bb.readInt32(bb.position()) + bb.position(), bb);
+};
+
 /**
  * @param {flatbuffers.ByteBuffer} bb
  * @returns {boolean}
@@ -453,6 +471,14 @@ Movie.finishMovieBuffer = function(builder, offset) {
   builder.finish(offset, 'MOVI');
 };
 
+/**
+ * @param {flatbuffers.Builder} builder
+ * @param {flatbuffers.Offset} offset
+ */
+Movie.finishSizePrefixedMovieBuffer = function(builder, offset) {
+  builder.finish(offset, 'MOVI', true);
+};
+
 /**
  * @param {flatbuffers.Builder} builder
  * @param {Character} mainCharacterType

tests/union_vector/union_vector_generated.ts

@@ -40,6 +40,15 @@ static getRootAsAttacker(bb:flatbuffers.ByteBuffer, obj?:Attacker):Attacker {
   return (obj || new Attacker).__init(bb.readInt32(bb.position()) + bb.position(), bb);
 };
 
+/**
+ * @param flatbuffers.ByteBuffer bb
+ * @param Attacker= obj
+ * @returns Attacker
+ */
+static getSizePrefixedRootAsAttacker(bb:flatbuffers.ByteBuffer, obj?:Attacker):Attacker {
+  return (obj || new Attacker).__init(bb.readInt32(bb.position()) + bb.position(), bb);
+};
+
 /**
  * @returns number
  */
@@ -224,6 +233,15 @@ static getRootAsMovie(bb:flatbuffers.ByteBuffer, obj?:Movie):Movie {
   return (obj || new Movie).__init(bb.readInt32(bb.position()) + bb.position(), bb);
 };
 
+/**
+ * @param flatbuffers.ByteBuffer bb
+ * @param Movie= obj
+ * @returns Movie
+ */
+static getSizePrefixedRootAsMovie(bb:flatbuffers.ByteBuffer, obj?:Movie):Movie {
+  return (obj || new Movie).__init(bb.readInt32(bb.position()) + bb.position(), bb);
+};
+
 /**
  * @param flatbuffers.ByteBuffer bb
  * @returns boolean
@@ -405,6 +423,14 @@ static finishMovieBuffer(builder:flatbuffers.Builder, offset:flatbuffers.Offset)
   builder.finish(offset, 'MOVI');
 };
 
+/**
+ * @param flatbuffers.Builder builder
+ * @param flatbuffers.Offset offset
+ */
+static finishSizePrefixedMovieBuffer(builder:flatbuffers.Builder, offset:flatbuffers.Offset) {
+  builder.finish(offset, 'MOVI', true);
+};
+
 static createMovie(builder:flatbuffers.Builder, mainCharacterType:Character, mainCharacterOffset:flatbuffers.Offset, charactersTypeOffset:flatbuffers.Offset, charactersOffset:flatbuffers.Offset):flatbuffers.Offset {
   Movie.startMovie(builder);
   Movie.addMainCharacterType(builder, mainCharacterType);