Squashed 'third_party/flatbuffers/' changes from acc9990ab..d6a8dbd26

d6a8dbd26 Experimental fix for failing oss-fuzz coverage build (#6259)
ed391e177 BREAKING: Rust flexbuffers serde human readable set to false (#6257)
a49531414 Update to flags in fuzzing-cmake file (#6256)
de1f0342c Remove _POSIX_C_SOURCE and _XOPEN_SOURCE definitions when compiling o… (#6205)
d0d51e2a5 flatc should support --binary --schema with optional scalar fields. (#6252)
33ab26017 Bump version of rules_go to 0.24.5 (#6234)
febb9d87c Union As Accessors for C# (#6251)
8778dc7c2 Resets buffer without deallocating current pointer (#6247)
aae376e9a Add GetBufferSpan() function to bufferbuilder (#6235)
0ff047148 Modernize android build and sample (#6229)
46a8c7e95 Added required-nested-flatbuffer to monster_test and fixed rust (#6236)
bc56c553e Notify based on Labelling issues and PR (#6241)
07d7cd78a Converted globs to use single quotes (#6240)
cdef70e24 More adjustments to the auto labeler (#6239)
9dd44df35 Updated Lua labeller glob (#6238)
c9b29d088 Support size-prefixed buffers and add tests for size-prefixed messages (#6232)
fba93e0ab Removes duplicate swift in labeler (#6228)
d1a545b1f Added more labels for auto labeler (#6227)
ea92a668d [C#] Optional Scalars (#6217)
6034de286 [Label Bot] Add Java and Kotlin support for the label bot (#6226)
b08b0a440 Implement `Debug` trait for Rust flatbuffers. (#6207)
17ae48dec [Label Bot] Adds some languages to labeler bot (#6222)
fc8097925 Auto Labeler Setup, Just C# for now (#6221)
55658f523 Auto Labeler Setup, Just C# for now (#6218)
14ecfe423 Updated comments and fixed a fundamental type error. (#6214)
a0182cdb1 optional scalars for ts/js (#6215)
0dfcc0a37 Adds NetTest.bat to run .NET Core tests on Windows (#6216)
f9a18ea63 [Java] Implement optional scalars (#6212)
c7586e85a Empties the sharedString map on reset on go and csharp (#6187)
914c64601 Removed C# references from java generator. Move annotations closer to definitions (#6204)
42d7c7997 Adds readable size to asserts in read functions (#6210)
e68e8d7de Refactor idl_gen_rust (#6206)
84809be7e Fix typo in flatbuffers::span declaration. (#6202)
1606fb637 Kotlin test optional enum (#6201)
fe8e3c7e5 Mass Refactoring to use `IsString` and other BASE_TYPE helpers (#6193)
8f6fa4b71 Updated SupportsAdvancedUnionFeatures to look out for string (#6190)
b46db38f5 [JS/TS] Rewrite flexbuffers JS to TS (#6148)
9fa1d2705 Rework enums in rust. (#6098)
a402b3aba idl_gen_json_schema Fix generation of arrays of enums (#6184)
0e1415b99 fix(go_test): remove deprecated grpc call (#6183)
5cd713710 Add generation of JSON Schema to library (#6165)
5be777e1d Bump junit from 4.12 to 4.13.1 in /grpc/tests (#6173)
a49d440ec Bump junit from 4.12 to 4.13.1 in /grpc (#6172)
4ec5e8db9 [C++] Add option to not generate direct copy methods. (#6166)
04bec23a3 Add Array initialization from struct constructor (#5865) (#6147)
77d57fd07 Cast to right type for reserved_ subtraction (#6167)
543c1bbeb Fixed rust nested flatbuffers for tables other than self (#6062)
cb971eece [C++] Fix -Wnarrowing and -Woverflow due to signed bitfields on G++ ARM (#6163)
7b9e61fcc [TS] GRPC  Implementation (#6141)
3359e3042 Moved C++ to optional_scalars2 and added some tests. (#6162)
187a4787f [Rust] Upgrade flatbuffers library to 2018 edition (#6159)
08943aa26 Flatbuffer C++ UnpackTo optimization for vectors of non-bool bytes. (#6154)
5975658eb Enables optional enums in swift (#6160)
5d3cf440e Updated Lobster test for optional bools/enums
8ec8322f0 Ruopt enum (#6156)
bbcc85fd4 Fix generation of C++ code with Optional<Enum> (#6155)
0bdf2fa15 [C#] Fix and improve project files (#6142)
2eedc769d possibility to create a vector from an iterator (#6135)
ab01ae162 flatc should output a warning, when an attribute is attached more than once (#6146)
689bfafa7 [Python/JS/TS] Codegen SizeOf method for structs (#6136)
641309a5b unix2dos on tests/FlatBuffers.Test/FlatBuffers.Core.Test.csproj (#6133)
52e362879 SpanT is available in .Net Standard 2.0. (#6137)
dca12522a Add static cast to avoid implicit double promotion. (#6132)
e0bbaa6f9 [C#]Change to ENABLE_SPAN_T that doesn't require UNSAFE_BYTEBUFFER. (#6073)
ab139d6be Revert "[C#] Fix and improve project files (#6116)" (#6130)
34d67b425 Minireflect fixed array (#6129)
96d5e3597 [JS/TS] fix flatbuffers default export (#6123)
eb686a86f Add missed file generated by optional_scalar.fbs (#6125)
750281630 [C#] Fix and improve project files (#6116)
fb4e1c34f Add CharToLower and CharToUpper into util.s (#6126)
8c67b5b12 Add support of Optional<T> scalars to C++ code generator (#6092)
6228b66d3 [Kotlin] Support for optional scalars. (#6115)
e1be8aaad Bump version for latest swift version (#6121)
94873e595 [JS/TS] Modernize TypeScript / JavaScript flatbuffers support (#6095)
b8e87fafe [JS] Add getFullyQualifiedName() (#6119)
f96d1ef74 [Java] allowing larger buffer sizes when growing a byte buffer (#6118)
89435303b [Swift] Migrates struct write APIS to write directly to the buffer (#6093)
c75ae2429 Optional-ness in reflection (#6097)
338944d3d Rename Nullable scalars to Optional scalars (#6112)
f5ab24bc4 Avoid memcpy call for empty vectors (#6111)
92a8c1a0f [JS] FlexBuffers Fix for wrong type of offset and length values (#6107)
6cea45dcd fix c# json serializer commandline argument docs (#6104)
fec58aa12 Fix for issue 6100: incorrect shrinking logic in ResizeContext() (#6102)
71aca81ff [JS] FlexBuffers Support (#5973)
04d87ffec [C++] Small refactoring of the C++ code generator (#6091)
bb25956f0 Wrap verify file id condition in Check call (#6085)
49f4948f0 + Add `removable-media` plug to the snapcraft config (#6083)
eeacc53d2 Adds proper access types for swift object api & flatbuffers & grpc (#6081)
f3003e08d [Lobster] missed a test
d713a0084 [CMake] enabled multi-core builds in VS projects
77f966f89 [Lobster] optional scalars support
e86d5b8e9 [Kotlin] Attach JvmStatic annotation to each method in companion object (#6052)
db2aa9b4e [C#] Cleaned up .NET testing script for Mono (#6016)
63cc0eec4 Adds a serialize helper function to native table (#6059)
c30a87de6 [TS] Fix four bugs with imported types in TypeScript. (#6054)
a0fb30575 [Swift] Append namespace for Swift Grpc implementation (#6049)
77c18c1d6 export a __version__ variable for python module (#5309)
f1f23d08e adding fb import when no other imports are present (#6030)
f1025b284 [Feature] Checks for Nullable strings (#6050)
5d052f4e5 [Swift] RFC: Switch Swift namespace from public enum to ordinary concat with _ (#6045)
18b015d25 Rust codegen improvements and lint fixes (#6046)
d76e93f27 adds code gen for optional scalars in swift (#6038)
82fac326c [C++] Fix compiler error from deleted assignment operator (#6036) (#6047)
043b52bd4 Optional Scalars support for Rust (#6034)
c8fa0afdf Allow to run cpp tests under grpc/tests/ using bazel. (#6040)
6d0aae73c Fix git command executed in wrong folder when doing cmake superbuild (#6039)
ff1b73128 [Swift] Optional Scalars Preparation (#6028)
2e48c8dd3 tests: Check for both quiet and signaling NaN on mipsel/hppa (#6029)
6942704f2 support deprecated flag in json schema (#6022)
9ecd2e16c Flatc parser support for nullable scalars (#6026)
33e2d8079 [Dart] Generate constant values map for enums (#6025)
969d0f7a6 Using proper symbol name for reexport (#6021)
515a4052a Silence false positive "-Wstringop-overflow" on GCC 10.0 to 11.0 (#6020)
36fbe6f13 Updated FB import (#6019)
b69fc8cc9 [Java] Add support for shared strings on FlatBufferBuilder. (#6012)
ab6af18d9 Not using non-existent create method for obj api (#6015)
37a5dee10 Code cleanup + updates test and readme (#6004)
8a721f69a Serde with bytes maps to Blob (#6009)
e810635ea [Swift] FlatBuffers createMonster method doesn't treat struct properly (#5992)
4995e1527 Manage grpc dependency in Bazel's WORKSPACE file. (#5995)
60b6066fe Add warning to schema parser if field name is not snake_case. (#6005)
35d45cac7 [Rust] Flexbuffers dependency cleanup and fixes (#5998)
165a6e3d1 Re-added Evolution Schema Code Generation Command (#5999)
13d3fb2ea Fix RPM install conflict (#6003)
d64078eb2 [Swift] Initialize memory when clear ByteBuffer (#5982)
ca1190a3d [TS] Use proper TypedArray in create*Vector (#5991)
7571b2ac5 [C++] Updates real_path to be truly portable (#5787)
e5a8f76a4 [C++] Generate default member initializers for >= C++11 (#5989)
413bb9b55 [Kotlin] Fix Access to union of vector element (#5994)
f35184aef [Swift] Add parsing from unowned UnsafeMutableRawPointer for ByteBuffer (#5981)
b124b7625 Removed requirement that enums be declared in ascending order. (#5887)
0ec7600c6 Do not remove the last digit from float values (#5974)
14baf45c9 Mark GetBufferMinAlignment() const (#5985)
9abb2ec2c TypeScript/JavaScript docs improvements (#5984)
2e57d80b1 [Swift] Internal library improvements (#5965)
cfc7753a4 [Doc] Added missing letters to compiler options (#5976)
12ddc8a92 Rust Flexbuffers Documentation update (#5979)
24ad35709 [docs] typo: updates monsterdata.json to be valid json (#5978)
cc44a4442 [idl_parser] Mark typefield as deprecated (#5958)
9ab4a5c0e Deleted old stale bot
6682cfe87 Increased Operations per run in stale.yml
64922904b Adding Stale Action to clean up PR and Issues
8e505cb67 [C++] Fixed/Enabled --cpp-ptr-type std::shared_ptr [#5813] (#5959)
a28357d7a Propagate boolean default values from proto to fbs (#5964)
7cb4762a6 [Swift] Improving reallocation time by using memcpy and moving reallocation code to storage (#5960)
4e45f7c9e Fix error in SimpleQSort (#5955)
7ac026405 fix error on GRPC Python - ignore namespace tree if not specified (#5862) (#5922)
108e981db Required is now implemented in swift (#5952)
94a78e385 Fixed: Access violation and ASAN/UNSAN failures with sorted tables
53fb453e0 [rust] Add FlatBufferBuilder::force_defaults API (#5946)
17c1f35fa [FlexBuffer][Java] ReadWriteBuf and ReadBuf interface public (#5948)
2eaf57778 [Java] Grow ArrayReadWriteBuf enough to match requested capacity. (#5921)
666800da3 Adds bool support in structs + updates grpc support + CI upgrades (#5943)
38ed69eb3 fixed mutating inline values (#5942)
d026e6f07 Add static asserts to ensure that reflection API arrays are kept in sync (#5934)
988164f6e [C++] Got rid of memset's in constructors (#5938)
7179a5a8b General Codebase clean up (#5939)
a0da0c08c Add GetStringView like GetString, GetCstring (#5937)
ac203b209 [C#] Add file identifier to ObjectAPI Serialization Utility. (#5920)
8dd1bf25b not creating creation methods when using structs (#5919)
5aa443d98 [Dart] Adding FlexBuffers support (#5853)
0fa087657 [Dart] Getting tests/DartTest.sh to work on master. (#5915)
424a473e1 Schema parser: prohibit declaration of an array of pointers inside structs (#5907)
c3faa8346 Fix Cargo.toml dependencies (#5911)
91399ad05 fix union type names (#5902)
32782e4ad Update Rust Flexbuffers metadata before publishing (#5905)
e7f3b1690 [TS] Make Obj-API work with --short-names (#5898)
12ed1fe4a fixed invalid imports with --gen-all (#5895)
85ee4df7a [C#] Thread safe reads of Double and Float values from a ByteBuffer (#5900)
de89bd193 Implement flexbuffers in python (#5880)
8be05f6bd Rust Flexbuffers (#5669)
870ecbc09 [swift] Moves code to use VTablesStorage (#5888)
c2da8d5d8 [Java][FlexBuffers] Make FlexBuffersBuilder reusable by adding clear() (#5889) (#5890)
e84cbff67 Align package name to FindFlatBuffers.cmake (#5899)
f94e6c84e Small tutorial improvements - documentation only (#5894)
f12cca8bc Attempt at adding Github Actions CI
7e4124d6e Handle git program or .git folder absence (#5878)
a875d247a only add native_include_files if object based api is enabled (#5886)
6e9f5d981 Respect shared attribute in Parser (#5885)
ff1c78233 include/flatbuffers: typo fixes in comments (#5884)
2e9a19673 Updates swift docs for package management (#5883)
e3cb07d32 [Rust] idl_gen_rust.cpp: (Option/required-aware codegen for unions) (#5850)
712866d57 Propagate use_string_pooling in CopyTable (#5879)
44c919a9e Not using reexports with --gen-all (#5873)
99aa1ef21 Added INCLUDE_PREFIX option for flatbuffers_generate_headers (#5866)
40ba170c9 Fixed text in internals doc that implied structs can be root
cb4d0f72e [Swift] Object API support  (#5826)
003e16405 [TS] Add Obj API (#5788)
21cf300f4 fix cpp usage markdown error (#5845)
9655e12d6 Upgraded swift implementation for grpc (#5843)
fb96fadc2 [C#] Fix nested structs and arrays in Object API (#5765)
408f11fbd [ts] Fix empty source/dest namespaces when reexporting. (#5841)
a83caf591 Improves performance for the swift library by using structs + a storage class (#5835)
925fab6b1 [Java][FlexBuffers] Optimize Map access (#5735)
d9fecc332 [CMake] : Add precompiled header support with FLATBUFFERS_ENABLE_PCH (#5827)
e9d453240 Added flatbuffers_generate_headers and flatbuffers_generate_binary_files cmake functions. (#5830)
c37c989ed Correct calculation of vector element size (#5831)
6b271b7ec Fix Clang-trunk warnings about special members deprecated in C++20. (#5829)
90f3b8e8c Fix `float_constant` definition in './doc/Grammar.md` (#5828)
3af735934 [csharp] flatc should generate a 'Create…' method for tables with struct field… (#5818)
c4231c3cb Updated doxyfile - added missing files (#5824)
9657df184 Update Grammar.md (#5820)
97ffc590e Include CPack only when explictly packaging (#5817)
8b52af65b [C++] Add max_depth and max_tables parameters to reflection::Verify (#5815)
9b034eee1 Fix interpretation of 'nan(number)' by the idl_parser (#5810)
3e9ac3cff [Scripts] Adds swift to generated code (#5806)
697147a2e updated maven build files
6df40a247 pre-tag version bump for 1.12
0dba63909 Removes the inner loop in the endtable check written tables (#5803)
0e3fdd0ee Escape characters in jsonschema descriptions (#5644)
45a2b07cb Remove `noexcept` qualifier copy-ctor of `union` type (#5800) (#5802)
d10c16314 Replace 'assert' by 'FLATBUFFERS_ASSERT' inside idl_parser.cpp (#5799)
35abb7f89 Add non-nullable modifier to return type of functions never returning null (#5797)
9954e09ab [C++] Generate code for vector force_align attribute. (#5796)
95a21327f rust: pub export the VectorIter type (#5736)
89b6183ee Fix Python min alignment
5a98d65e8 [Rust] Add gen-name-strings for Rust (#5757)
f73d205bc Removed assert that wasn't backwards compatible.
7c37abe92 [C#] add ObjectAPI Serialization Utility (#5785)
4749e77b0 Fixed docs on how to obtain parser error.
6ff189841 Added --filename-suffix and --filename-ext to flatc (#5778)
c9a30c9ca Fixed refractoring issue in reflection/generate_code.sh. Also, mv deletes the original file, so I don't need to clean it up manually in that case. (#5777)
8c02d17be Skip writing reflection_generated.h if not changed (#5776)
34305c4ce [Swift] Adds GRPC to Swift (#5758)
cd88e6b2a [Java][FlexBuffers] Abstract buffer access from ByteBuffer (#5743)
3ec7a53c6 Adds cocoapods and a readme of how to get the package (#5771)
6d44cede7 [snap] Fix versioning (#5727)
cc08c0835 [Python] Fixed potential allignment issue (#5768)
54f8b787c Fix memory leak on cpp object api (#5761)
17557f913 [Python] Fixed issue #5499 (#5764)
d54af8cd4 [C++] Use strong enum type for vectors when scoped-enums is on. (#5750)
173e10fdf [C#] support Json Serialization (#5752)
8f56990f6 FlexBuffers: C++: scalar-only typed vectors were not aligned.
6400c9b05 Bump Rust port to 0.6.1 (#5747)
7418d8587 [C#] support Object API (#5710)
c580fa284 Adds min and max, comments, and all of swift's keywords + fix docs (#5737)
f2a127230 Use VS 2017 and 2019 on CI, fix cast issue in dart_idl (#5740)
316d7c208 Creates a flatbuffers validation function + small fix (#5725)
47026ea6b Added the code to embed the binary schema to the source (--bfbs-gen-embed). (#5701)
3f677f241 [Java][FlexBuffers] Deprecate typed vector strings due to design flaw (#5722)
a593a11e5 [Go] Implements a SharedStrings function (#5733)
7cdfc8475 [Swift] Fix padding function overflow when bufSize is 0 (#5721)
bab2b0db4 Add vcpkg installation instructions (#5732)
89418eb84 [Dart] Fix deprecated field support, inf/nan (#5724)
9cadf05d8 [typescript] Size-prefixed root accessors not taking into account size prefix (#5717)
6da1cf79d [rust] Add use declarations to Rust-generated bindings for imported FB definitions (#5645)
bee1df96d [Go] Replace references to hardcoded ”Monster" etc with idiomatic go wherever possible (#5716)
01189d7ed [C++] Fix for printing of enum in case output_enum_identifiers=1. (#5706)
c4b2b0a25 [Swift] Support create long string (#5709)
a4b2884e4 Added create function for swift (#5707)
04d80f255 [Swift] Swift implementation 🎉🎉 (#5603)
55686100a Changed direct calls to strtod to use StringToNumber
718351831 Document JSON compatibility guarantees. (#5704)
d1b34f0f2 Add CMake 'generated_code' target to simplify resolution of build dependencies (#5697)
21b706196 (Optionally) add an additional suffix namespace to generated fbs files. (#5698)
35daaf83d [Java] Replace Table.UTF8_CHARSET with StandardCharsets.UTF_8 (#5696)
3b458f7a1 Rust: Temporarily disable 2 endianness unit tests (#5695)
a5d9d0f7d [C++17] Add Traits class for Tables and Factory function within it. (#5678)
3cd9b6434 Removed code_generators.cpp from library targets
355dfd48d [rust] Make enum names public (#5690)
bcd58a159 Correct inverted logic around include prefixes. (#5689)
a2c12900a Optimize Pack method using numpy (#5662)
901b89e73 [C++] Add Builder and Table typedefs (#5685)
31f879908 Minor doc updates: FlexBuffers C#, Discord, CppUsage.
8023d99e2 Upgrade rules_go (#5684)
b4154405d Fix --incompatible_load_cc_rules_from_bzl (#5683)
04c17c7a7 Add support for absl::string_view when available (#5682)
62ec7d52c [Bazel] Add support for compatible_with and restricted_to (#5681)
7de668053 CI: New Docker tests for Python with numpy (#5677)
3a70e0b30 Fixed struct initialization error on older versions of C#
9b1320135 Fixed warnings in FlexBuffers.java
5e3916050 Fixed out of date licenses on gRPC Python files.
c95755051 Removed test proto output.
44bf71988 Add flatc '--cpp_std' switch (#5656)
3e8f15df9 Fix for FlexBuffers FBT_VECTOR_STRING size bit-width.
602721a73 Added Check to VerifyAlignment (#5675)
13c05f4da Improve import handling for proto conversion (#5673)
ce3a1c43a [Dart] Fix prepare space for writeListInt64 and writeListUint64 (#5654)
aa75e5734 Make Rust constants public (#5659)
2790fee25 Add namespace qualification to union types (#5666)
eddebec1b Bugfix for Rust generation of union fields named with language keywords (#5592)
030fee36a wrap multiple statements in do {} while(!IsConstTrue(true)) (#5655)
f9724d1bd [gRPC] Uncomment MessageBuilder (#5658)
b20801ca4 Supress unsigned-integer-overflow for PaddingBytes (#5647)
a8e800bd7 Add --force-empty-vectors option (#5653)
d7530ae96 Fixed enum min/max values not properly escaped.
99d11e279 Split Bazel targets into multiple packages (#5640)
4fd8eb214 Remove a static_assert (#5643)
65f870357 Flatbuffers Python Object API (#5616)
75823cc27 [Clang 10]: definition of implicit copy constructor for 'TableKeyComparatoris deprecated #5649 (#5650)
58e279244 [docs]: add missing semicolon (#5648)
3c964e10a [GO] Fix support for enums with underscores and Unions with imported members (#5600)
c3c32ec94 Fix ambiguity of a type deduction in TEST_EQ macro if arguments have `enum class` type. (#5630)
075e8d676 Simplify declarations of x-macro FLATBUFFERS_TD (#5638)
bcf1bd5c9 read vtable size through ReadScalar() (#5636)
136d75fa6 Changed null checks in test. Removed verifier pointer usage (#5634)
091fa1fd1 Add testing of C++ with sanitizers (CI-Docker) (#5631)
ff3781dc2 add namespace prefix in FLATBUFFERS_MAX_BUFFER_SIZE (#5629)
6beb9f49c Support for python grpc - continuing the work from the pull request #4270 #4705 (#5613)
80988ea86 Removed idl_gen_general.cpp and move contents to code_generators.cpp (#5625)
0f2ff7eaa Lua cleanup (#5624)
dda095023 [C++] Adds basic schema evolution tests (#5611)
adbcbba5d [C++, C#, Java] Separated C# and Java generators into their own classes (#5618)
cbbd6aca0 add check for root_type specified for json schema generation (#5622)
405c64e07 [Rust] Bump smallvec version to 1.0 (#5621)
42c08cbca Ran src/clang-format-all.sh (#5617)
33d5dd9bd Improved pull request & clang-format instructions.
105dd528e Change monster_extra generation to use flatbuffers::unique_ptr (#5612)
f0f0efe7b [C++] Refactor to conform to Google C++ style guide (#5608)
e837d5a29 Fixed deprecated method in GRPC Java test.
9834ee978 Fixed Apache license not using canonical version.
44b2ab087 include/flatbuffers/base.h: fix no_sanitize issue with old clang (#5610)
46ae3f80a [C++, Java, C#, TypeScript, JavaScript] Skip generation of mutable union types (#5599)
7b38aa71e flatbuffers.h: fix documentation warning (#5607)
661bedd83 Add Lua FlatbufferBuilder Clean() method to enable reuseable builders (#5606)
8526e12d7 [Kotlin] Fix union vector accessor after change in Java API (#5605)
3c7b660d6 [flatc] Remove an always true condition for flexbuffers (#5604)
964365ba6 [Go] Add UnPackTo functions (#5598)
32254b7ac [Go] Object API support (#5339)
521e255ad Rust: Add idiomatic iterator for Vector type (#5579)
1b85292fd Fix typos in comments (#5590)
480815447 C++ verifier for evolved union fields should return true (#5586)
8d5e424c6 Add ByteBuffer copy for vector of bytes in Java (#5587)
b4774d235 Rust: Fix Copy and Clone impls for a few generic types (#5577)
26f238c24 Add `--clean-first` to the cmake-build command (travis) (#5574)
e93c8c46e Fix Follow implementation for bool (#5554)
e21516b9d Fix issue #5557 (#5573)
fbc11e8ae Avoid intentional unsigned integer overflow getting caught by sanitizers (#5572)
e9d29c21a Python: Add forceDefaults opt to python Builder (#5564)
8bfafc76d Java: Don't annotate vector-of-tables item getters with @nullable. (#5562)
df3e8bf4a Fixed warnings generated by recent JSON sorting feature.
5665cfe49 [Java] byte buffer factory returned buffer capcity is used instead of the requested size (#5558)
5797540ed #5544 Fix of Array of table is not sorted if Create<type>Direct() is used (#5546)
7f1af7cb0 Fix build with gcc version 7.4.0 (#5570)
32f47ad24 Fixed JSON parser not sorting vectors of tables/structs with key.
842f672ba [FlexBuffers][Java] Cache size of Sized objects in FlexBuffers (#5551)
d4cae0a62 Fix issue #5542 (#5543)
f1147f65b Fixed Android STLPort related error.
69d3fec48 Fix namespaced struct/field name collision detection (#5540) (#5545)
cfb4ecf6f [flac] Add FlexBuffers option for generating data (#5519)
a92039687 Update Rust versions under test from 1.30.1 to 1.37.0 (#5538)
625338d09 Adds XOPEN_SOURCE for PATH_MAX and POSIX 1993 for stat (#5529)
3f8ce99c5 [FlexBuffers][Java] Add override Key::toString (#5533)
0798b7b69 [FlexBuffers][Java] Fix wrong access to a string using Reference::asString(). (#5532)
cbdf82e2f Fix Mutate() methods of Array<scalar/struct> (override 5508) (#5526)
e365c502f Java: Added access object for vector of struct and vector of tables. (#5233)
97f3aa917 Fixed DetachedBuffer self move assignment (#5521)
2f5bb2eec Fix buildifier warnings found in new bazel (#5517)
917687c7a Fixed Reflection Verifier not handling vectors of unions.
f9277e691 Fixed GenerateText not handling vectors of unions.
2706381ee Add element size parameter to __vector_as_arraysegment [c#] (#5512)
b5560fcd5 [Java][FlexBuffers] Improve documentation for FlexBuffers in Java. (#5506)
782b865c5 Annotate getters with @Pure when --java-checkerframework is specified. (#5510)
3bfc86eaf [Dart]fix: segment fault with empty namespace when generating dart file (#5507)
c0282873f Rust: Fixed cargo clippy on non-generated code (#5485)
4b870aca9 [Javascript] Fix syntax error for signed enum (#5503)
d0e3870c0 [C#] Fix retrieving enumeration vectors as arrays (#5457)
fb25eb87f Doc typo fixes (#5505)
cb35d3a0e Use all of the available space in the buffer returned by ByteBufferFactory to allow the factory to keep a pool of larger than initialsize sized buffers. (#5500)
8e6cabb31 [FlexBuffers][Java] Implementation of FlexBuffers API (#5476)
bd31dd242 Clarified value reuse in FlexBuffers
65b67d213 Fixed test build invocation of arrays_test.fbs
1fbb71132 FlexBuffers: allow any values to be shared.
cd75a3658 Android: remove app_dummy() calls
ec6b0bf29 Fixed STLPort Android compile error
c11b5d744 [bugfix]flexbuffers isvector bugfix (#5488)
4525c91be Fix incorrect padding in arrays of structs (Issue #5484) (#5491)
b97b342f5 Fixed missing generated code.
c1058a903 C++ IDL generation adds superfluous semicolon in GenTablePost, causing (#5483)
303044934 [go]add Name() for ForceCodec  interface (#5486)
a2485d4ec reflection: check for valid union enum value during object verification (#5475)
a20e71ac9 has_method support for primitive fields in java runtime. Changed: idl.h, FlatBufferBuilder.java ,  idl_gen_general.cpp, idl_parser.cpp, flatc.cpp (#5468)

Change-Id: I836f4b43e6818bb16425a87899e6234ac86242aa
git-subtree-dir: third_party/flatbuffers
git-subtree-split: d6a8dbd26ff08a8868e0d0c1b4b67d31b40e4a7f
diff --git a/src/idl_gen_js_ts.cpp b/src/idl_gen_js_ts.cpp
index 9c89c1a..0240f51 100644
--- a/src/idl_gen_js_ts.cpp
+++ b/src/idl_gen_js_ts.cpp
@@ -15,6 +15,7 @@
  */
 
 // independent from idl_parser, since this code is not needed for most clients
+#include <algorithm>
 #include <cassert>
 #include <unordered_map>
 #include <unordered_set>
@@ -26,8 +27,6 @@
 
 namespace flatbuffers {
 
-const std::string kGeneratedFileNamePostfix = "_generated";
-
 struct JsTsLanguageParameters {
   IDLOptions::Language language;
   std::string file_extension;
@@ -61,12 +60,6 @@
   }
 }
 
-static std::string GeneratedFileName(const std::string &path,
-                                     const std::string &file_name,
-                                     const JsTsLanguageParameters &lang) {
-  return path + file_name + kGeneratedFileNamePostfix + lang.file_extension;
-}
-
 namespace jsts {
 // Iterate through all definitions we haven't generate code for (enums, structs,
 // and tables) and output them to a single file.
@@ -78,7 +71,8 @@
 
   JsTsGenerator(const Parser &parser, const std::string &path,
                 const std::string &file_name)
-      : BaseGenerator(parser, path, file_name, "", "."),
+      : BaseGenerator(parser, path, file_name, "", ".",
+                      parser.opts.lang == IDLOptions::kJs ? "js" : "ts"),
         lang_(GetJsLangParams(parser_.opts.lang)) {}
   // Iterate through all definitions we haven't generate code for (enums,
   // structs, and tables) and output them to a single file.
@@ -87,7 +81,7 @@
     reexport_map reexports;
 
     std::string enum_code, struct_code, import_code, exports_code, code;
-    generateEnums(&enum_code, &exports_code, reexports);
+    generateEnums(&enum_code, &exports_code, reexports, imported_files);
     generateStructs(&struct_code, &exports_code, imported_files);
     generateImportDependencies(&import_code, imported_files);
     generateReexports(&import_code, reexports, imported_files);
@@ -112,8 +106,8 @@
       code += exports_code;
     }
 
-    return SaveFile(GeneratedFileName(path_, file_name_, lang_).c_str(), code,
-                    false);
+    return SaveFile(GeneratedFileName(path_, file_name_, parser_.opts).c_str(),
+                    code, false);
   }
 
  private:
@@ -127,9 +121,7 @@
       const auto &file = *it;
       const auto basename =
           flatbuffers::StripPath(flatbuffers::StripExtension(file));
-      if (basename != file_name_) {
-        code += GenPrefixedImport(file, basename);
-      }
+      if (basename != file_name_) { code += GenPrefixedImport(file, basename); }
     }
   }
 
@@ -142,34 +134,47 @@
       return;
     }
 
+    std::unordered_set<std::string> imported;
+
     std::string &code = *code_ptr;
     for (auto it = reexports.begin(); it != reexports.end(); ++it) {
       const auto &file = *it;
       const auto basename =
           flatbuffers::StripPath(flatbuffers::StripExtension(file.first));
-      if (basename != file_name_) {
+      if (basename != file_name_ &&
+          imported.find(file.second.symbol) == imported.end()) {
         if (imported_files.find(file.first) == imported_files.end()) {
           code += GenPrefixedImport(file.first, basename);
           imported_files.emplace(file.first);
         }
 
-        code += "export namespace " + file.second.target_namespace + " { \n";
+        if (!file.second.target_namespace.empty()) {
+          code += "export namespace " + file.second.target_namespace + " { \n";
+        }
         code += "export import " + file.second.symbol + " = ";
-        code += GenFileNamespacePrefix(file.first) + "." +
-                file.second.source_namespace + "." + file.second.symbol +
-                "; }\n";
+        code += GenFileNamespacePrefix(file.first) + ".";
+        if (!file.second.source_namespace.empty()) {
+          code += file.second.source_namespace + ".";
+        }
+        code += file.second.symbol + ";\n";
+        if (!file.second.target_namespace.empty()) { code += "}\n"; }
+
+        imported.emplace(file.second.symbol);
       }
     }
   }
 
   // Generate code for all enums.
   void generateEnums(std::string *enum_code_ptr, std::string *exports_code_ptr,
-                     reexport_map &reexports) {
+                     reexport_map &reexports,
+                     imported_fileset &imported_files) {
     for (auto it = parser_.enums_.vec.begin(); it != parser_.enums_.vec.end();
          ++it) {
       auto &enum_def = **it;
-      GenEnum(enum_def, enum_code_ptr, exports_code_ptr, reexports, false);
-      GenEnum(enum_def, enum_code_ptr, exports_code_ptr, reexports, true);
+      GenEnum(enum_def, enum_code_ptr, exports_code_ptr, reexports,
+              imported_files, false);
+      GenEnum(enum_def, enum_code_ptr, exports_code_ptr, reexports,
+              imported_files, true);
     }
   }
 
@@ -213,13 +218,15 @@
     // Emit namespaces in a form that Closure Compiler can optimize
     std::string &code = *code_ptr;
     std::string &exports = *exports_ptr;
+
+    if (lang_.language == IDLOptions::kTs) {
+      code += "import * as flatbuffers from 'flatbuffers';\n";
+    }
+
     for (auto it = sorted_namespaces.begin(); it != sorted_namespaces.end();
          ++it) {
       if (lang_.language == IDLOptions::kTs) {
-        if (it->find('.') == std::string::npos) {
-          code += "import { flatbuffers } from \"./flatbuffers\"\n";
-          break;
-        }
+        if (it->find('.') == std::string::npos) { break; }
       } else {
         code += "/**\n * @const\n * @namespace\n */\n";
         if (it->find('.') == std::string::npos) {
@@ -309,14 +316,12 @@
         result += " " + type_name;
         break;
       }
-      default: { result += " {" + type_name + "}"; }
+      default: {
+        result += " {" + type_name + "}";
+      }
     }
-    if (!arg_name.empty()) {
-      result += " " + arg_name;
-    }
-    if (include_newline) {
-      result += "\n";
-    }
+    if (!arg_name.empty()) { result += " " + arg_name; }
+    if (include_newline) { result += "\n"; }
 
     return result;
   }
@@ -324,7 +329,7 @@
   // Generate an enum declaration and an enum string lookup table.
   void GenEnum(EnumDef &enum_def, std::string *code_ptr,
                std::string *exports_ptr, reexport_map &reexports,
-               bool reverse) {
+               imported_fileset &imported_files, bool reverse) {
     if (enum_def.generated) return;
     if (reverse && lang_.language == IDLOptions::kTs) return;  // FIXME.
     std::string &code = *code_ptr;
@@ -359,7 +364,7 @@
 
       // Generate mapping between EnumName: EnumValue(int)
       if (reverse) {
-        code += "  " + enum_def.ToString(ev);
+        code += "  '" + enum_def.ToString(ev) + "'";
         code += lang_.language == IDLOptions::kTs ? "= " : ": ";
         code += "'" + ev.name + "'";
       } else {
@@ -371,16 +376,23 @@
       code += (it + 1) != enum_def.Vals().end() ? ",\n" : "\n";
 
       if (ev.union_type.struct_def) {
-        ReexportDescription desc = { ev.name,
+        ReexportDescription desc = { ev.union_type.struct_def->name,
                                      GetNameSpace(*ev.union_type.struct_def),
                                      GetNameSpace(enum_def) };
         reexports.insert(
             std::make_pair(ev.union_type.struct_def->file, std::move(desc)));
       }
     }
+    code += "};";
 
-    if (lang_.language == IDLOptions::kTs && !ns.empty()) { code += "}"; }
-    code += "};\n\n";
+    if (lang_.language == IDLOptions::kTs) {
+      if (enum_def.is_union) {
+        code += GenUnionConvFunc(enum_def.underlying_type, imported_files);
+      }
+      if (!ns.empty()) { code += "\n}"; }
+    }
+
+    code += "\n\n";
   }
 
   static std::string GenType(const Type &type) {
@@ -408,7 +420,12 @@
     switch (type.base_type) {
       case BASE_TYPE_STRING: return GenBBAccess() + ".__string" + arguments;
       case BASE_TYPE_STRUCT: return GenBBAccess() + ".__struct" + arguments;
-      case BASE_TYPE_UNION: return GenBBAccess() + ".__union" + arguments;
+      case BASE_TYPE_UNION:
+        if (!UnionHasStringType(*type.enum_def) ||
+            lang_.language == IDLOptions::kJs) {
+          return GenBBAccess() + ".__union" + arguments;
+        }
+        return GenBBAccess() + ".__union_with_string" + arguments;
       case BASE_TYPE_VECTOR: return GenGetter(type.VectorType(), arguments);
       default: {
         auto getter =
@@ -425,12 +442,18 @@
     }
   }
 
-  std::string GenBBAccess() {
+  std::string GenBBAccess() const {
     return lang_.language == IDLOptions::kTs ? "this.bb!" : "this.bb";
   }
 
-  std::string GenDefaultValue(const Value &value, const std::string &context) {
-    if (value.type.enum_def) {
+  std::string GenDefaultValue(const FieldDef &field, const std::string &context) {
+    if (field.IsScalarOptional()) {
+      return "null";
+    }
+
+    const auto &value = field.value;
+    if (value.type.enum_def && value.type.base_type != BASE_TYPE_UNION &&
+        value.type.base_type != BASE_TYPE_VECTOR) {
       if (auto val = value.type.enum_def->FindByValue(value.constant)) {
         if (lang_.language == IDLOptions::kTs) {
           return GenPrefixedTypeName(WrapInNameSpace(*value.type.enum_def),
@@ -450,7 +473,13 @@
     switch (value.type.base_type) {
       case BASE_TYPE_BOOL: return value.constant == "0" ? "false" : "true";
 
-      case BASE_TYPE_STRING: return "null";
+      case BASE_TYPE_STRING:
+      case BASE_TYPE_UNION:
+      case BASE_TYPE_STRUCT: {
+        return "null";
+      }
+
+      case BASE_TYPE_VECTOR: return "[]";
 
       case BASE_TYPE_LONG:
       case BASE_TYPE_ULONG: {
@@ -467,10 +496,9 @@
   std::string GenTypeName(const Type &type, bool input,
                           bool allowNull = false) {
     if (!input) {
-      if (type.base_type == BASE_TYPE_STRING ||
-          type.base_type == BASE_TYPE_STRUCT) {
+      if (IsString(type) || type.base_type == BASE_TYPE_STRUCT) {
         std::string name;
-        if (type.base_type == BASE_TYPE_STRING) {
+        if (IsString(type)) {
           name = "string|Uint8Array";
         } else {
           name = WrapInNameSpace(*type.struct_def);
@@ -480,13 +508,17 @@
     }
 
     switch (type.base_type) {
-      case BASE_TYPE_BOOL: return "boolean";
+      case BASE_TYPE_BOOL: return (allowNull) ? ("boolean|null") : ("boolean");
       case BASE_TYPE_LONG:
-      case BASE_TYPE_ULONG: return "flatbuffers.Long";
+      case BASE_TYPE_ULONG: return (allowNull) ? ("flatbuffers.Long|null") : ("flatbuffers.Long");
       default:
         if (IsScalar(type.base_type)) {
-          if (type.enum_def) { return WrapInNameSpace(*type.enum_def); }
-          return "number";
+          if (type.enum_def) {
+            const auto enum_name = WrapInNameSpace(*type.enum_def);
+            return (allowNull) ? (enum_name + "|null") : (enum_name);
+          }
+          
+          return (allowNull) ? ("number|null") : ("number");
         }
         return "flatbuffers.Offset";
     }
@@ -528,10 +560,10 @@
     if (parser_.opts.keep_include_path) {
       auto it = parser_.included_files_.find(full_file_name);
       FLATBUFFERS_ASSERT(it != parser_.included_files_.end());
-      path =
-          flatbuffers::StripExtension(it->second) + kGeneratedFileNamePostfix;
+      path = flatbuffers::StripExtension(it->second) +
+             parser_.opts.filename_suffix;
     } else {
-      path = base_name + kGeneratedFileNamePostfix;
+      path = base_name + parser_.opts.filename_suffix;
     }
 
     // Add the include prefix and make the path always relative
@@ -566,11 +598,11 @@
                       nameprefix + field.name + "_");
       } else {
         *annotations +=
-            GenTypeAnnotation(kParam, GenTypeName(field.value.type, true),
+            GenTypeAnnotation(kParam, GenTypeName(field.value.type, true, field.optional),
                               nameprefix + field.name);
         if (lang_.language == IDLOptions::kTs) {
           *arguments += ", " + nameprefix + field.name + ": " +
-                        GenTypeName(field.value.type, true);
+                        GenTypeName(field.value.type, true, field.optional);
         } else {
           *arguments += ", " + nameprefix + field.name;
         }
@@ -604,8 +636,14 @@
     }
   }
 
+  std::string GenerateNewExpression(const std::string &object_name) {
+    return "new " + object_name +
+           (lang_.language == IDLOptions::kTs ? "()" : "");
+  }
+
   void GenerateRootAccessor(StructDef &struct_def, std::string *code_ptr,
-                 std::string &code, std::string &object_name, bool size_prefixed) {
+                            std::string &code, std::string &object_name,
+                            bool size_prefixed) {
     if (!struct_def.fixed) {
       GenDocComment(code_ptr,
                     GenTypeAnnotation(kParam, "flatbuffers.ByteBuffer", "bb") +
@@ -613,35 +651,43 @@
                         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 += "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 += object_name + ".get" + (size_prefixed ? sizePrefixed : "") +
+                "Root" + Verbose(struct_def, "As");
         code += " = function(bb, obj) {\n";
       }
-      code += "  return (obj || new " + object_name;
+      if (size_prefixed) {
+        code +=
+            "  bb.setPosition(bb.position() + "
+            "flatbuffers.SIZE_PREFIX_LENGTH);\n";
+      }
+      code += "  return (obj || " + GenerateNewExpression(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) {
+                        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));
+              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";
+        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 += object_name + ".finish" + (size_prefixed ? sizePrefixed : "") +
+                Verbose(struct_def) + "Buffer";
         code += " = function(builder, offset) {\n";
       }
 
@@ -650,9 +696,7 @@
         code += ", '" + parser_.file_identifier_ + "'";
       }
       if (size_prefixed) {
-        if (parser_.file_identifier_.empty()) {
-          code += ", undefined";
-        }
+        if (parser_.file_identifier_.empty()) { code += ", undefined"; }
         code += ", true";
       }
       code += ");\n";
@@ -660,6 +704,602 @@
     }
   }
 
+  static std::string GetObjApiClassName(const StructDef &sd,
+                                        const IDLOptions &opts) {
+    return GetObjApiClassName(sd.name, opts);
+  }
+
+  static std::string GetObjApiClassName(const std::string &name,
+                                        const IDLOptions &opts) {
+    return opts.object_prefix + name + opts.object_suffix;
+  }
+
+  bool UnionHasStringType(const EnumDef &union_enum) {
+    return std::any_of(union_enum.Vals().begin(), union_enum.Vals().end(),
+                       [](const EnumVal *ev) {
+                         return !(ev->IsZero()) &&
+                                (IsString(ev->union_type));
+                       });
+  }
+
+  std::string GenUnionGenericTypeTS(const EnumDef &union_enum) {
+    return std::string("T") + (UnionHasStringType(union_enum) ? "|string" : "");
+  }
+
+  std::string GenUnionTypeTS(const EnumDef &union_enum,
+                             imported_fileset &imported_files) {
+    std::string ret;
+    std::set<std::string> type_list;
+
+    for (auto it = union_enum.Vals().begin(); it != union_enum.Vals().end();
+         ++it) {
+      const auto &ev = **it;
+      if (ev.IsZero()) { continue; }
+
+      std::string type = "";
+      if (IsString(ev.union_type)) {
+        type = "string";  // no need to wrap string type in namespace
+      } else if (ev.union_type.base_type == BASE_TYPE_STRUCT) {
+        if (!parser_.opts.generate_all) {
+          imported_files.insert(ev.union_type.struct_def->file);
+        }
+
+        type = GenPrefixedTypeName(WrapInNameSpace(*(ev.union_type.struct_def)),
+                                   ev.union_type.struct_def->file);
+      } else {
+        FLATBUFFERS_ASSERT(false);
+      }
+      type_list.insert(type);
+    }
+
+    for (auto it = type_list.begin(); it != type_list.end(); ++it) {
+      ret += *it + ((std::next(it) == type_list.end()) ? "" : "|");
+    }
+
+    return ret;
+  }
+
+  // Generate a TS union type based on a union's enum
+  std::string GenObjApiUnionTypeTS(const IDLOptions &opts,
+                                   const EnumDef &union_enum) {
+    std::string ret = "";
+    std::set<std::string> type_list;
+
+    for (auto it = union_enum.Vals().begin(); it != union_enum.Vals().end();
+         ++it) {
+      const auto &ev = **it;
+      if (ev.IsZero()) { continue; }
+
+      std::string type = "";
+      if (IsString(ev.union_type)) {
+        type = "string";  // no need to wrap string type in namespace
+      } else if (ev.union_type.base_type == BASE_TYPE_STRUCT) {
+        type = GenPrefixedTypeName(
+            GetObjApiClassName(WrapInNameSpace(*(ev.union_type.struct_def)),
+                               opts),
+            union_enum.file);
+      } else {
+        FLATBUFFERS_ASSERT(false);
+      }
+      type_list.insert(type);
+    }
+
+    size_t totalPrinted = 0;
+    for (auto it = type_list.begin(); it != type_list.end(); ++it) {
+      ++totalPrinted;
+      ret += *it + ((totalPrinted == type_list.size()) ? "" : "|");
+    }
+
+    return ret;
+  }
+
+  std::string GenUnionConvFuncName(const EnumDef &enum_def) {
+    return "unionTo" + enum_def.name;
+  }
+
+  std::string GenUnionListConvFuncName(const EnumDef &enum_def) {
+    return "unionListTo" + enum_def.name;
+  }
+
+  std::string GenUnionConvFunc(const Type &union_type,
+                               imported_fileset &imported_files) {
+    if (union_type.enum_def) {
+      const auto &enum_def = *union_type.enum_def;
+
+      const auto valid_union_type = GenUnionTypeTS(enum_def, imported_files);
+      const auto valid_union_type_with_null = valid_union_type + "|null";
+
+      auto ret = "\n\nexport function " + GenUnionConvFuncName(enum_def) +
+                 "(\n  type: " + enum_def.name +
+                 ",\n  accessor: (obj:" + valid_union_type + ") => " +
+                 valid_union_type_with_null +
+                 "\n): " + valid_union_type_with_null + " {\n";
+
+      if (!parser_.opts.generate_all) {
+        imported_files.insert(union_type.enum_def->file);
+      }
+
+      const auto enum_type = GenPrefixedTypeName(
+          WrapInNameSpace(*(union_type.enum_def)), union_type.enum_def->file);
+      const auto &union_enum = *(union_type.enum_def);
+
+      const auto union_enum_loop = [&](const std::string &accessor_str) {
+        ret += "  switch(" + enum_type + "[type]) {\n";
+        ret += "    case 'NONE': return null; \n";
+
+        for (auto it = union_enum.Vals().begin(); it != union_enum.Vals().end();
+             ++it) {
+          const auto &ev = **it;
+          if (ev.IsZero()) { continue; }
+
+          ret += "    case '" + ev.name + "': ";
+
+          if (IsString(ev.union_type)) {
+            ret += "return " + accessor_str + "'') as string;";
+          } else if (ev.union_type.base_type == BASE_TYPE_STRUCT) {
+            const auto type = GenPrefixedTypeName(
+                WrapInNameSpace(*(ev.union_type.struct_def)),
+                ev.union_type.struct_def->file);
+            ret += "return " + accessor_str + "new " + type + "())! as " +
+                   type + ";";
+          } else {
+            FLATBUFFERS_ASSERT(false);
+          }
+          ret += "\n";
+        }
+
+        ret += "    default: return null;\n";
+        ret += "  }\n";
+      };
+
+      union_enum_loop("accessor(");
+      ret += "}";
+
+      ret += "\n\nexport function " + GenUnionListConvFuncName(enum_def) +
+             "(\n  type: " + enum_def.name +
+             ", \n  accessor: (index: number, obj:" + valid_union_type +
+             ") => " + valid_union_type_with_null +
+             ", \n  index: number\n): " + valid_union_type_with_null + " {\n";
+      union_enum_loop("accessor(index, ");
+      ret += "}";
+
+      return ret;
+    }
+    FLATBUFFERS_ASSERT(0);
+    return "";
+  }
+
+  // Used for generating a short function that returns the correct class
+  // based on union enum type. Assume the context is inside the non object api
+  // type
+  std::string GenUnionValTS(const std::string &field_name,
+                            const Type &union_type,
+                            const bool is_array = false) {
+    if (union_type.enum_def) {
+      const auto &enum_def = *union_type.enum_def;
+      const auto enum_type =
+          GenPrefixedTypeName(WrapInNameSpace(enum_def), enum_def.file);
+      const std::string union_accessor = "this." + field_name;
+
+      const auto union_has_string = UnionHasStringType(enum_def);
+      const auto field_binded_method = "this." + field_name + ".bind(this)";
+
+      std::string ret;
+
+      if (!is_array) {
+        const auto conversion_function =
+            GenPrefixedTypeName(WrapInNameSpace(enum_def.defined_namespace,
+                                                GenUnionConvFuncName(enum_def)),
+                                enum_def.file);
+        const auto target_enum = "this." + field_name + "Type()";
+
+        ret = "(() => {\n";
+        ret += "      let temp = " + conversion_function + "(" + target_enum +
+               ", " + field_binded_method + ");\n";
+        ret += "      if(temp === null) { return null; }\n";
+        ret += union_has_string
+                   ? "      if(typeof temp === 'string') { return temp; }\n"
+                   : "";
+        ret += "      return temp.unpack()\n";
+        ret += "  })()";
+      } else {
+        const auto conversion_function = GenPrefixedTypeName(
+            WrapInNameSpace(enum_def.defined_namespace,
+                            GenUnionListConvFuncName(enum_def)),
+            enum_def.file);
+        const auto target_enum_accesor = "this." + field_name + "Type";
+        const auto target_enum_length = target_enum_accesor + "Length()";
+
+        ret = "(() => {\n";
+        ret += "    let ret = [];\n";
+        ret += "    for(let targetEnumIndex = 0; targetEnumIndex < " +
+               target_enum_length +
+               "; "
+               "++targetEnumIndex) {\n";
+        ret += "      let targetEnum = " + target_enum_accesor +
+               "(targetEnumIndex);\n";
+        ret += "      if(targetEnum === null || " + enum_type +
+               "[targetEnum!] === 'NONE') { "
+               "continue; }\n\n";
+        ret += "      let temp = " + conversion_function + "(targetEnum, " +
+               field_binded_method + ", targetEnumIndex);\n";
+        ret += "      if(temp === null) { continue; }\n";
+        ret += union_has_string ? "      if(typeof temp === 'string') { "
+                                  "ret.push(temp); continue; }\n"
+                                : "";
+        ret += "      ret.push(temp.unpack());\n";
+        ret += "    }\n";
+        ret += "    return ret;\n";
+        ret += "  })()";
+      }
+
+      return ret;
+    }
+
+    FLATBUFFERS_ASSERT(0);
+    return "";
+  }
+
+  static std::string GenNullCheckConditional(const std::string &nullCheckVar,
+                                      const std::string &trueVal,
+                                      const std::string &falseVal = "null") {
+    return "(" + nullCheckVar + " !== null ? " + trueVal + " : " + falseVal +
+           ")";
+  }
+
+  std::string GenStructMemberValueTS(const StructDef &struct_def,
+                                     const std::string &prefix,
+                                     const std::string &delimiter,
+                                     const bool nullCheck = true) {
+    std::string ret;
+    for (auto it = struct_def.fields.vec.begin();
+         it != struct_def.fields.vec.end(); ++it) {
+      auto &field = **it;
+
+      const auto curr_member_accessor =
+          prefix + "." + MakeCamel(field.name, false);
+      if (IsStruct(field.value.type)) {
+        ret += GenStructMemberValueTS(*field.value.type.struct_def,
+                                      curr_member_accessor, delimiter);
+      } else {
+        if (nullCheck) {
+          ret +=
+              "(" + prefix + " === null ? 0 : " + curr_member_accessor + "!)";
+        } else {
+          ret += curr_member_accessor;
+        }
+      }
+
+      if (std::next(it) != struct_def.fields.vec.end()) { ret += delimiter; }
+    }
+
+    return ret;
+  }
+
+  void GenObjApi(const Parser &parser, StructDef &struct_def,
+                 std::string &obj_api_unpack_func, std::string &obj_api_class,
+                 imported_fileset &imported_files) {
+    const auto class_name = GetObjApiClassName(struct_def, parser.opts);
+
+    std::string unpack_func =
+        "\n/**\n * " + GenTypeAnnotation(kReturns, class_name, "") +
+        " */\nunpack(): " + class_name + " {\n  return new " + class_name +
+        "(" + (struct_def.fields.vec.empty() ? "" : "\n");
+    std::string unpack_to_func =
+        "/**\n * " + GenTypeAnnotation(kParam, class_name, "_o") +
+        " */\nunpackTo(_o: " + class_name + "): void {" +
+        +(struct_def.fields.vec.empty() ? "" : "\n");
+
+    std::string constructor_annotation = "/**\n * @constructor";
+    constructor_annotation += (struct_def.fields.vec.empty() ? "" : "\n");
+    std::string constructor_func = "constructor(";
+    constructor_func += (struct_def.fields.vec.empty() ? "" : "\n");
+
+    const auto has_create =
+        struct_def.fixed || CanCreateFactoryMethod(struct_def);
+
+    std::string pack_func_prototype =
+        "/**\n * " +
+        GenTypeAnnotation(kParam, "flatbuffers.Builder", "builder") + " * " +
+        GenTypeAnnotation(kReturns, "flatbuffers.Offset", "") +
+        " */\npack(builder:flatbuffers.Builder): flatbuffers.Offset {\n";
+
+    std::string pack_func_offset_decl;
+    std::string pack_func_create_call;
+
+    const auto struct_name =
+        GenPrefixedTypeName(WrapInNameSpace(struct_def), struct_def.file);
+
+    if (has_create) {
+      pack_func_create_call = "  return " + struct_name + ".create" +
+                              Verbose(struct_def) + "(builder" +
+                              (struct_def.fields.vec.empty() ? "" : ",\n    ");
+    } else {
+      pack_func_create_call = "  " + struct_name + ".start(builder);\n";
+    }
+
+    if (struct_def.fixed) {
+      // when packing struct, nested struct's members instead of the struct's
+      // offset are used
+      pack_func_create_call +=
+          GenStructMemberValueTS(struct_def, "this", ",\n    ", false) + "\n  ";
+    }
+
+    for (auto it = struct_def.fields.vec.begin();
+         it != struct_def.fields.vec.end(); ++it) {
+      auto &field = **it;
+      if (field.deprecated) continue;
+
+      const auto field_name = MakeCamel(field.name, false);
+      const std::string field_binded_method =
+          "this." + field_name + ".bind(this)";
+
+      std::string field_val;
+      std::string field_type;
+      // a string that declares a variable containing the
+      // offset for things that can't be generated inline
+      // empty otw
+      std::string field_offset_decl;
+      // a string that contains values for things that can be created inline or
+      // the variable name from field_offset_decl
+      std::string field_offset_val;
+      const auto field_default_val =
+          GenDefaultValue(field, "flatbuffers");
+
+      // Emit a scalar field
+      const auto is_string = IsString(field.value.type);
+      if (IsScalar(field.value.type.base_type) || is_string) {
+        const auto has_null_default = is_string || HasNullDefault(field);
+
+        if (field.value.type.enum_def) {
+          if (!parser_.opts.generate_all) {
+            imported_files.insert(field.value.type.enum_def->file);
+          }
+
+          field_type +=
+              GenPrefixedTypeName(GenTypeName(field.value.type, false, has_null_default),
+                                  field.value.type.enum_def->file);
+        } else {
+          field_type += GenTypeName(field.value.type, false, has_null_default);
+        }
+        field_val = "this." + field_name + "()";
+
+        if (field.value.type.base_type != BASE_TYPE_STRING) {
+          field_offset_val = "this." + field_name;
+        } else {
+          field_offset_decl = GenNullCheckConditional(
+              "this." + field_name,
+              "builder.createString(this." + field_name + "!)", "0");
+        }
+      }
+
+      // Emit an object field
+      else {
+        auto is_vector = false;
+        switch (field.value.type.base_type) {
+          case BASE_TYPE_STRUCT: {
+            const auto &sd = *field.value.type.struct_def;
+            field_type += GenPrefixedTypeName(
+                WrapInNameSpace(sd.defined_namespace,
+                                GetObjApiClassName(sd, parser.opts)),
+                field.value.type.struct_def->file);
+
+            const std::string field_accessor = "this." + field_name + "()";
+            field_val = GenNullCheckConditional(field_accessor,
+                                                field_accessor + "!.unpack()");
+            field_offset_val = GenNullCheckConditional(
+                "this." + field_name, "this." + field_name + "!.pack(builder)",
+                "0");
+
+            break;
+          }
+
+          case BASE_TYPE_VECTOR: {
+            auto vectortype = field.value.type.VectorType();
+            auto vectortypename = GenTypeName(vectortype, false);
+            is_vector = true;
+
+            field_type = "(";
+
+            switch (vectortype.base_type) {
+              case BASE_TYPE_STRUCT: {
+                const auto &sd = *field.value.type.struct_def;
+                field_type += GenPrefixedTypeName(
+                    WrapInNameSpace(sd.defined_namespace,
+                                    GetObjApiClassName(sd, parser.opts)),
+                    field.value.type.struct_def->file);
+                field_type += ")[]";
+
+                field_val = GenBBAccess() + ".createObjList(" +
+                            field_binded_method + ", this." + field_name +
+                            "Length())";
+
+                if (sd.fixed) {
+                  field_offset_decl =
+                      "builder.createStructOffsetList(this." + field_name +
+                      ", " +
+                      GenPrefixedTypeName(WrapInNameSpace(struct_def),
+                                          struct_def.file) +
+                      ".start" + MakeCamel(field_name) + "Vector)";
+                } else {
+                  field_offset_decl =
+                      GenPrefixedTypeName(WrapInNameSpace(struct_def),
+                                          struct_def.file) +
+                      ".create" + MakeCamel(field_name) +
+                      "Vector(builder, builder.createObjectOffsetList(" +
+                      "this." + field_name + "))";
+                }
+
+                break;
+              }
+
+              case BASE_TYPE_STRING: {
+                field_type += "string)[]";
+                field_val = GenBBAccess() + ".createStringList(" +
+                            field_binded_method + ", this." + field_name +
+                            "Length())";
+                field_offset_decl =
+                    GenPrefixedTypeName(WrapInNameSpace(struct_def),
+                                        struct_def.file) +
+                    ".create" + MakeCamel(field_name) +
+                    "Vector(builder, builder.createObjectOffsetList(" +
+                    "this." + field_name + "))";
+                break;
+              }
+
+              case BASE_TYPE_UNION: {
+                field_type +=
+                    GenObjApiUnionTypeTS(parser.opts, *(vectortype.enum_def));
+                field_type += ")[]";
+                field_val = GenUnionValTS(field_name, vectortype, true);
+
+                field_offset_decl =
+                    GenPrefixedTypeName(WrapInNameSpace(struct_def),
+                                        struct_def.file) +
+                    ".create" + MakeCamel(field_name) +
+                    "Vector(builder, builder.createObjectOffsetList(" +
+                    "this." + field_name + "))";
+
+                break;
+              }
+              default: {
+                if (vectortype.enum_def) {
+                  if (!parser_.opts.generate_all) {
+                    imported_files.insert(vectortype.enum_def->file);
+                  }
+
+                  field_type +=
+                      GenPrefixedTypeName(GenTypeName(vectortype, false, HasNullDefault(field)),
+                                          vectortype.enum_def->file);
+                } else {
+                  field_type += vectortypename;
+                }
+                field_type += ")[]";
+                field_val = GenBBAccess() + ".createScalarList(" +
+                            field_binded_method + ", this." + field_name +
+                            "Length())";
+
+                field_offset_decl =
+                    GenPrefixedTypeName(WrapInNameSpace(struct_def),
+                                        struct_def.file) +
+                    ".create" + MakeCamel(field_name) +
+                    "Vector(builder, this." + field_name + ")";
+
+                break;
+              }
+            }
+
+            break;
+          }
+
+          case BASE_TYPE_UNION: {
+            if (!parser_.opts.generate_all) {
+              imported_files.insert(field.value.type.enum_def->file);
+            }
+
+            field_type +=
+                GenObjApiUnionTypeTS(parser.opts, *(field.value.type.enum_def));
+
+            field_val = GenUnionValTS(field_name, field.value.type);
+            field_offset_decl =
+                "builder.createObjectOffset(this." + field_name + ")";
+            break;
+          }
+
+          default: FLATBUFFERS_ASSERT(0); break;
+        }
+
+        // length 0 vector is simply empty instead of null
+        field_type += is_vector ? "" : "|null";
+      }
+
+      if (!field_offset_decl.empty()) {
+        field_offset_decl =
+            "  const " + field_name + " = " + field_offset_decl + ";";
+      }
+      if (field_offset_val.empty()) { field_offset_val = field_name; }
+
+      unpack_func += "    " + field_val;
+      unpack_to_func += "  _o." + field_name + " = " + field_val + ";";
+
+      constructor_annotation +=
+          " * " + GenTypeAnnotation(kParam, field_type, field_name, false);
+      constructor_func += "  public " + field_name + ": " + field_type + " = " +
+                          field_default_val;
+
+      if (!struct_def.fixed) {
+        if (!field_offset_decl.empty()) {
+          pack_func_offset_decl += field_offset_decl + "\n";
+        }
+
+        if (has_create) {
+          pack_func_create_call += field_offset_val;
+        } else {
+          pack_func_create_call += "  " + struct_name + ".add" +
+                                   MakeCamel(field.name) + "(builder, " +
+                                   field_offset_val + ");\n";
+        }
+      }
+
+      if (std::next(it) != struct_def.fields.vec.end()) {
+        constructor_annotation += "\n";
+        constructor_func += ",\n";
+
+        if (!struct_def.fixed && has_create) {
+          pack_func_create_call += ",\n    ";
+        }
+
+        unpack_func += ",\n";
+        unpack_to_func += "\n";
+      } else {
+        constructor_func += "\n";
+        if (!struct_def.fixed) {
+          pack_func_offset_decl += (pack_func_offset_decl.empty() ? "" : "\n");
+          pack_func_create_call += "\n  ";
+        }
+
+        unpack_func += "\n  ";
+        unpack_to_func += "\n";
+      }
+    }
+
+    constructor_annotation += "\n */\n";
+    constructor_func += "){};\n\n";
+
+    if (has_create) {
+      pack_func_create_call += ");";
+    } else {
+      pack_func_create_call += "return " + struct_name + ".end(builder);";
+    }
+
+    obj_api_class = "\nexport class " +
+                    GetObjApiClassName(struct_def, parser.opts) + " {\n";
+
+    obj_api_class += constructor_annotation + constructor_func;
+
+    obj_api_class += pack_func_prototype + pack_func_offset_decl +
+                     pack_func_create_call + "\n};";
+
+    obj_api_class += "\n}\n";
+
+    unpack_func += ");\n};";
+    unpack_to_func += "};\n";
+
+    obj_api_unpack_func = unpack_func + "\n\n" + unpack_to_func;
+  }
+
+  static bool CanCreateFactoryMethod(const StructDef &struct_def) {
+    // to preserve backwards compatibility, we allow the first field to be a
+    // struct
+    return struct_def.fields.vec.size() < 2 ||
+           std::all_of(std::begin(struct_def.fields.vec) + 1,
+                       std::end(struct_def.fields.vec),
+                       [](const FieldDef *f) -> bool {
+                         FLATBUFFERS_ASSERT(f != nullptr);
+                         return f->value.type.base_type != BASE_TYPE_STRUCT;
+                       });
+  }
+
   // 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,
@@ -682,7 +1322,8 @@
       code += " {\n";
       if (lang_.language != IDLOptions::kTs) {
         code += "  /**\n";
-        code += "   * " + GenTypeAnnotation(kType, "flatbuffers.ByteBuffer", "");
+        code +=
+            "   * " + GenTypeAnnotation(kType, "flatbuffers.ByteBuffer", "");
         code += "   */\n";
       }
       code += "  bb: flatbuffers.ByteBuffer|null = null;\n";
@@ -752,10 +1393,9 @@
     // Generate the identifier check method
     if (!struct_def.fixed && parser_.root_struct_def_ == &struct_def &&
         !parser_.file_identifier_.empty()) {
-      GenDocComment(
-          code_ptr,
-          GenTypeAnnotation(kParam, "flatbuffers.ByteBuffer", "bb") +
-              GenTypeAnnotation(kReturns, "boolean", "", false));
+      GenDocComment(code_ptr,
+                    GenTypeAnnotation(kParam, "flatbuffers.ByteBuffer", "bb") +
+                        GenTypeAnnotation(kReturns, "boolean", "", false));
       if (lang_.language == IDLOptions::kTs) {
         code +=
             "static bufferHasIdentifier(bb:flatbuffers.ByteBuffer):boolean "
@@ -778,20 +1418,22 @@
           NumToString(field.value.offset) + ");\n  return offset ? ";
 
       // Emit a scalar field
-      if (IsScalar(field.value.type.base_type) ||
-          field.value.type.base_type == BASE_TYPE_STRING) {
+      const auto is_string = IsString(field.value.type);
+      if (IsScalar(field.value.type.base_type) || is_string) {
+        const auto has_null_default = is_string || HasNullDefault(field);
+
         GenDocComment(
             field.doc_comment, code_ptr,
-            std::string(field.value.type.base_type == BASE_TYPE_STRING
+            std::string(is_string
                             ? GenTypeAnnotation(kParam, "flatbuffers.Encoding=",
                                                 "optionalEncoding")
                             : "") +
                 GenTypeAnnotation(kReturns,
-                                  GenTypeName(field.value.type, false, true),
+                                  GenTypeName(field.value.type, false, has_null_default),
                                   "", false));
         if (lang_.language == IDLOptions::kTs) {
           std::string prefix = MakeCamel(field.name, false) + "(";
-          if (field.value.type.base_type == BASE_TYPE_STRING) {
+          if (is_string) {
             code += prefix + "):string|null\n";
             code += prefix + "optionalEncoding:flatbuffers.Encoding" +
                     "):" + GenTypeName(field.value.type, false, true) + "\n";
@@ -802,7 +1444,7 @@
           if (field.value.type.enum_def) {
             code +=
                 "):" +
-                GenPrefixedTypeName(GenTypeName(field.value.type, false, true),
+                GenPrefixedTypeName(GenTypeName(field.value.type, false, field.optional),
                                     field.value.type.enum_def->file) +
                 " {\n";
 
@@ -810,12 +1452,12 @@
               imported_files.insert(field.value.type.enum_def->file);
             }
           } else {
-            code += "):" + GenTypeName(field.value.type, false, true) + " {\n";
+            code += "):" + GenTypeName(field.value.type, false, has_null_default) + " {\n";
           }
         } else {
           code += object_name + ".prototype." + MakeCamel(field.name, false);
           code += " = function(";
-          if (field.value.type.base_type == BASE_TYPE_STRING) {
+          if (is_string) {
             code += "optionalEncoding";
           }
           code += ") {\n";
@@ -829,12 +1471,12 @@
               ";\n";
         } else {
           std::string index = "this.bb_pos + offset";
-          if (field.value.type.base_type == BASE_TYPE_STRING) {
+          if (is_string) {
             index += ", optionalEncoding";
           }
           code += offset_prefix +
                   GenGetter(field.value.type, "(" + index + ")") + " : " +
-                  GenDefaultValue(field.value, GenBBAccess());
+                  GenDefaultValue(field, GenBBAccess());
           code += ";\n";
         }
       }
@@ -860,19 +1502,21 @@
             }
 
             if (struct_def.fixed) {
-              code += "  return (obj || new " + type;
+              code += "  return (obj || " + GenerateNewExpression(type);
               code += ").__init(this.bb_pos";
               code +=
                   MaybeAdd(field.value.offset) + ", " + GenBBAccess() + ");\n";
             } else {
-              code += offset_prefix + "(obj || new " + type + ").__init(";
+              code += offset_prefix + "(obj || " + GenerateNewExpression(type) +
+                      ").__init(";
               code += field.value.type.struct_def->fixed
                           ? "this.bb_pos + offset"
                           : GenBBAccess() + ".__indirect(this.bb_pos + offset)";
               code += ", " + GenBBAccess() + ") : null;\n";
             }
 
-            if (lang_.language == IDLOptions::kTs && !parser_.opts.generate_all) {
+            if (lang_.language == IDLOptions::kTs &&
+                !parser_.opts.generate_all) {
               imported_files.insert(field.value.type.struct_def->file);
             }
 
@@ -882,6 +1526,12 @@
           case BASE_TYPE_VECTOR: {
             auto vectortype = field.value.type.VectorType();
             auto vectortypename = GenTypeName(vectortype, false);
+
+            if (vectortype.enum_def) {
+              vectortypename = GenPrefixedTypeName(vectortypename,
+                                                   vectortype.enum_def->file);
+            }
+
             auto inline_size = InlineSize(vectortype);
             auto index = GenBBAccess() +
                          ".__vector(this.bb_pos + offset) + index" +
@@ -914,8 +1564,11 @@
               if (is_union) { prefix += "<T extends flatbuffers.Table>"; }
               prefix += "(index: number";
               if (is_union) {
-                vectortypename = "T";
-                code += prefix + ", obj:T";
+                const auto union_type =
+                    GenUnionGenericTypeTS(*(field.value.type.enum_def));
+
+                vectortypename = union_type;
+                code += prefix + ", obj:" + union_type;
               } else if (vectortype.base_type == BASE_TYPE_STRUCT) {
                 vectortypename = GenPrefixedTypeName(
                     vectortypename, vectortype.struct_def->file);
@@ -924,13 +1577,17 @@
                 if (!parser_.opts.generate_all) {
                   imported_files.insert(vectortype.struct_def->file);
                 }
-              } else if (vectortype.base_type == BASE_TYPE_STRING) {
+              } else if (IsString(vectortype)) {
                 code += prefix + "):string\n";
                 code += prefix + ",optionalEncoding:flatbuffers.Encoding" +
                         "):" + vectortypename + "\n";
                 code += prefix + ",optionalEncoding?:any";
               } else {
                 code += prefix;
+
+                if (vectortype.enum_def && !parser_.opts.generate_all) {
+                  imported_files.insert(vectortype.enum_def->file);
+                }
               }
               code += "):" + vectortypename + "|null {\n";
             } else {
@@ -939,14 +1596,15 @@
               code += " = function(index";
               if (vectortype.base_type == BASE_TYPE_STRUCT || is_union) {
                 code += ", obj";
-              } else if (vectortype.base_type == BASE_TYPE_STRING) {
+              } else if (IsString(vectortype)) {
                 code += ", optionalEncoding";
               }
               code += ") {\n";
             }
 
             if (vectortype.base_type == BASE_TYPE_STRUCT) {
-              code += offset_prefix + "(obj || new " + vectortypename;
+              code += offset_prefix + "(obj || " +
+                      GenerateNewExpression(vectortypename);
               code += ").__init(";
               code += vectortype.struct_def->fixed
                           ? index
@@ -955,7 +1613,7 @@
             } else {
               if (is_union) {
                 index = "obj, " + index;
-              } else if (vectortype.base_type == BASE_TYPE_STRING) {
+              } else if (IsString(vectortype)) {
                 index += ", optionalEncoding";
               }
               code += offset_prefix + GenGetter(vectortype, "(" + index + ")");
@@ -991,7 +1649,13 @@
                                       false));
             if (lang_.language == IDLOptions::kTs) {
               code += MakeCamel(field.name, false);
-              code += "<T extends flatbuffers.Table>(obj:T):T|null {\n";
+
+              const auto &union_enum = *(field.value.type.enum_def);
+              const auto union_type = GenUnionGenericTypeTS(union_enum);
+              code += "<T extends flatbuffers.Table>(obj:" + union_type +
+                      "):" + union_type +
+                      "|null "
+                      "{\n";
             } else {
               code +=
                   object_name + ".prototype." + MakeCamel(field.name, false);
@@ -1015,7 +1679,8 @@
       }
 
       // Adds the mutable scalar value to the output
-      if (IsScalar(field.value.type.base_type) && parser.opts.mutable_buffer) {
+      if (IsScalar(field.value.type.base_type) && parser.opts.mutable_buffer &&
+          !IsUnion(field.value.type)) {
         std::string annotations = GenTypeAnnotation(
             kParam, GenTypeName(field.value.type, true), "value");
         GenDocComment(
@@ -1025,6 +1690,10 @@
         if (lang_.language == IDLOptions::kTs) {
           std::string type;
           if (field.value.type.enum_def) {
+            if (!parser_.opts.generate_all) {
+              imported_files.insert(field.value.type.enum_def->file);
+            }
+
             type = GenPrefixedTypeName(GenTypeName(field.value.type, true),
                                        field.value.type.enum_def->file);
           } else {
@@ -1037,19 +1706,26 @@
                   " = function(value) {\n";
         }
 
-        code += "  var offset = " + GenBBAccess() + ".__offset(this.bb_pos, " +
-                NumToString(field.value.offset) + ");\n\n";
-        code += "  if (offset === 0) {\n";
-        code += "    return false;\n";
-        code += "  }\n\n";
+        if (struct_def.fixed) {
+          code += "  " + GenBBAccess() + ".write" +
+                  MakeCamel(GenType(field.value.type)) + "(this.bb_pos + " +
+                  NumToString(field.value.offset) + ", ";
+        } else {
+          code += "  var offset = " + GenBBAccess() +
+                  ".__offset(this.bb_pos, " + NumToString(field.value.offset) +
+                  ");\n\n";
+          code += "  if (offset === 0) {\n";
+          code += "    return false;\n";
+          code += "  }\n\n";
 
-        // special case for bools, which are treated as uint8
-        code += "  " + GenBBAccess() + ".write" +
-                MakeCamel(GenType(field.value.type)) +
-                "(this.bb_pos + offset, ";
-        if (field.value.type.base_type == BASE_TYPE_BOOL &&
-            lang_.language == IDLOptions::kTs) {
-          code += "+";
+          // special case for bools, which are treated as uint8
+          code += "  " + GenBBAccess() + ".write" +
+                  MakeCamel(GenType(field.value.type)) +
+                  "(this.bb_pos + offset, ";
+          if (field.value.type.base_type == BASE_TYPE_BOOL &&
+              lang_.language == IDLOptions::kTs) {
+            code += "+";
+          }
         }
 
         code += "value);\n";
@@ -1064,7 +1740,7 @@
       }
 
       // Emit vector helpers
-      if (field.value.type.base_type == BASE_TYPE_VECTOR) {
+      if (IsVector(field.value.type)) {
         // Emit a length helper
         GenDocComment(code_ptr,
                       GenTypeAnnotation(kReturns, "number", "", false));
@@ -1118,6 +1794,30 @@
       }
     }
 
+    // Emit the fully qualified name
+    if (parser_.opts.generate_name_strings) {
+      GenDocComment(code_ptr, GenTypeAnnotation(kReturns, "string", "", false));
+      if (lang_.language == IDLOptions::kTs) {
+        code += "static getFullyQualifiedName():string {\n";
+      } else {
+        code += object_name + ".getFullyQualifiedName = function() {\n";
+      }
+      code += "  return '" + WrapInNameSpace(struct_def) + "';\n";
+      code += "}\n\n";
+    }
+
+    // Emit the size of the struct.
+    if (struct_def.fixed) {
+      GenDocComment(code_ptr, GenTypeAnnotation(kReturns, "number", "", false));
+      if (lang_.language == IDLOptions::kTs) {
+        code += "static sizeOf():number {\n";
+      } else {
+        code += object_name + ".sizeOf = function() {\n";
+      }
+      code += "  return " + NumToString(struct_def.bytesize) + ";\n";
+      code += "}\n\n";
+    }
+
     // Emit a factory constructor
     if (struct_def.fixed) {
       std::string annotations =
@@ -1174,7 +1874,7 @@
         if (lang_.language == IDLOptions::kTs) {
           code += "static add" + MakeCamel(field.name);
           code += "(builder:flatbuffers.Builder, " + argname + ":" +
-                  GetArgType(field) + ") {\n";
+                  GetArgType(field, false) + ") {\n";
         } else {
           code += object_name + ".add" + MakeCamel(field.name);
           code += " = function(builder, " + argname + ") {\n";
@@ -1186,13 +1886,19 @@
         code += argname + ", ";
         if (!IsScalar(field.value.type.base_type)) {
           code += "0";
+        } else if (HasNullDefault(field)) {
+          if (IsLong(field.value.type.base_type)) {
+            code += "builder.createLong(0, 0)";
+          } else {
+            code += "0";
+          }
         } else {
           if (field.value.type.base_type == BASE_TYPE_BOOL) { code += "+"; }
-          code += GenDefaultValue(field.value, "builder");
+          code += GenDefaultValue(field, "builder");
         }
         code += ");\n};\n\n";
 
-        if (field.value.type.base_type == BASE_TYPE_VECTOR) {
+        if (IsVector(field.value.type)) {
           auto vector_type = field.value.type.VectorType();
           auto alignment = InlineAlignment(vector_type);
           auto elem_size = InlineSize(vector_type);
@@ -1210,11 +1916,37 @@
                                       false));
 
             if (lang_.language == IDLOptions::kTs) {
-              code += "static create" + MakeCamel(field.name);
+              const std::string sig_begin =
+                  "static create" + MakeCamel(field.name) +
+                  "Vector(builder:flatbuffers.Builder, data:";
+              const std::string sig_end = "):flatbuffers.Offset";
               std::string type = GenTypeName(vector_type, true) + "[]";
-              if (type == "number[]") { type += " | Uint8Array"; }
-              code += "Vector(builder:flatbuffers.Builder, data:" + type +
-                      "):flatbuffers.Offset {\n";
+              if (type == "number[]") {
+                const auto &array_type = GenType(vector_type);
+                // the old type should be deprecated in the future
+                std::string type_old = "number[]|Uint8Array";
+                std::string type_new = "number[]|" + array_type + "Array";
+                if (type_old == type_new) {
+                  type = type_new;
+                } else {
+                  // add function overloads
+                  code += sig_begin + type_new + sig_end + ";\n";
+                  code +=
+                      "/**\n * @deprecated This Uint8Array overload will "
+                      "be removed in the future.\n */\n";
+                  code += sig_begin + type_old + sig_end + ";\n";
+                  type = type_new + "|Uint8Array";
+                }
+              } else {
+                if (vector_type.enum_def) {
+                  if (!parser_.opts.generate_all) {
+                    imported_files.insert(vector_type.enum_def->file);
+                  }
+
+                  type = GenPrefixedTypeName(type, vector_type.enum_def->file);
+                }
+              }
+              code += sig_begin + type + sig_end + " {\n";
             } else {
               code += object_name + ".create" + MakeCamel(field.name);
               code += "Vector = function(builder, data) {\n";
@@ -1284,85 +2016,120 @@
       GenerateFinisher(struct_def, code_ptr, code, object_name, true);
 
       // Generate a convenient CreateX function
-      if (lang_.language == IDLOptions::kJs) {
-        std::string paramDoc =
-            GenTypeAnnotation(kParam, "flatbuffers.Builder", "builder");
+      if (CanCreateFactoryMethod(struct_def)) {
+        if (lang_.language == IDLOptions::kJs) {
+          std::string paramDoc =
+              GenTypeAnnotation(kParam, "flatbuffers.Builder", "builder");
+          for (auto it = struct_def.fields.vec.begin();
+               it != struct_def.fields.vec.end(); ++it) {
+            const auto &field = **it;
+            if (field.deprecated) continue;
+            paramDoc +=
+                GenTypeAnnotation(kParam, GetArgType(field, true), GetArgName(field));
+          }
+          paramDoc +=
+              GenTypeAnnotation(kReturns, "flatbuffers.Offset", "", false);
+
+          GenDocComment(code_ptr, paramDoc);
+        }
+
+        if (lang_.language == IDLOptions::kTs) {
+          code += "static create" + Verbose(struct_def);
+          code += "(builder:flatbuffers.Builder";
+        } else {
+          code += object_name + ".create" + Verbose(struct_def);
+          code += " = function(builder";
+        }
         for (auto it = struct_def.fields.vec.begin();
              it != struct_def.fields.vec.end(); ++it) {
           const auto &field = **it;
-          if (field.deprecated)
-            continue;
-          paramDoc +=
-              GenTypeAnnotation(kParam, GetArgType(field), GetArgName(field));
+          if (field.deprecated) continue;
+
+          if (lang_.language == IDLOptions::kTs) {
+            code += ", " + GetArgName(field) + ":" + GetArgType(field, true);
+          } else {
+            code += ", " + GetArgName(field);
+          }
         }
-        paramDoc +=
-            GenTypeAnnotation(kReturns, "flatbuffers.Offset", "", false);
-
-        GenDocComment(code_ptr, paramDoc);
-      }
-
-      if (lang_.language == IDLOptions::kTs) {
-        code += "static create" + Verbose(struct_def);
-        code += "(builder:flatbuffers.Builder";
-      } else {
-        code += object_name + ".create" + Verbose(struct_def);
-        code += " = function(builder";
-      }
-      for (auto it = struct_def.fields.vec.begin();
-           it != struct_def.fields.vec.end(); ++it) {
-        const auto &field = **it;
-        if (field.deprecated)
-          continue;
 
         if (lang_.language == IDLOptions::kTs) {
-          code += ", " + GetArgName(field) + ":" + GetArgType(field);
+          code += "):flatbuffers.Offset {\n";
+          code += "  " + struct_def.name + ".start" + Verbose(struct_def) +
+                  "(builder);\n";
         } else {
-          code += ", " + GetArgName(field);
+          code += ") {\n";
+          code += "  " + object_name + ".start" + Verbose(struct_def) +
+                  "(builder);\n";
         }
-      }
 
-      if (lang_.language == IDLOptions::kTs) {
-        code += "):flatbuffers.Offset {\n";
-        code += "  " + struct_def.name + ".start" + Verbose(struct_def) +
+        std::string methodPrefix =
+            lang_.language == IDLOptions::kTs ? struct_def.name : object_name;
+        for (auto it = struct_def.fields.vec.begin();
+             it != struct_def.fields.vec.end(); ++it) {
+          const auto &field = **it;
+          if (field.deprecated) continue;
+
+          const auto arg_name = GetArgName(field);
+
+          if (field.IsScalarOptional()) {
+            code += "  if (" + arg_name + " !== null)\n  ";
+          }
+
+          code += "  " + methodPrefix + ".add" + MakeCamel(field.name) + "(";
+          code += "builder, " + arg_name + ");\n";
+        }
+
+        code += "  return " + methodPrefix + ".end" + Verbose(struct_def) +
                 "(builder);\n";
-      } else {
-        code += ") {\n";
-        code += "  " + object_name + ".start" + Verbose(struct_def) +
-                "(builder);\n";
+        code += "}\n";
+        if (lang_.language == IDLOptions::kJs) code += "\n";
       }
+    }
 
-      std::string methodPrefix =
-          lang_.language == IDLOptions::kTs ? struct_def.name : object_name;
-      for (auto it = struct_def.fields.vec.begin();
-           it != struct_def.fields.vec.end(); ++it) {
-        const auto &field = **it;
-        if (field.deprecated)
-          continue;
-
-        code += "  " + methodPrefix + ".add" + MakeCamel(field.name) + "(";
-        code += "builder, " + GetArgName(field) + ");\n";
-      }
-
-      code += "  return " + methodPrefix + ".end" + Verbose(struct_def) +
-              "(builder);\n";
+    if (!struct_def.fixed && parser_.services_.vec.size() != 0 &&
+        lang_.language == IDLOptions::kTs) {
+      auto name = Verbose(struct_def, "");
+      code += "\n";
+      code += "serialize():Uint8Array {\n";
+      code += "  return this.bb!.bytes();\n";
       code += "}\n";
-      if (lang_.language == IDLOptions::kJs)
-        code += "\n";
+
+      code += "\n";
+      code += "static deserialize(buffer: Uint8Array):"+ name +" {\n";
+      code += "  return " + name + ".getRootAs" + name +
+              "(new flatbuffers.ByteBuffer(buffer))\n";
+      code += "}\n";
     }
 
     if (lang_.language == IDLOptions::kTs) {
-      if (!object_namespace.empty()) {
+      if (parser_.opts.generate_object_based_api) {
+        std::string obj_api_class;
+        std::string obj_api_unpack_func;
+        GenObjApi(parser_, struct_def, obj_api_unpack_func, obj_api_class,
+                  imported_files);
+
+        code += obj_api_unpack_func + "}\n" + obj_api_class;
+      } else {
         code += "}\n";
       }
-      code += "}\n";
+      if (!object_namespace.empty()) { code += "}\n"; }
     }
   }
+  
+  static bool HasNullDefault(const FieldDef &field) {
+    return field.optional && field.value.constant == "null";
+  }
 
-  std::string GetArgType(const FieldDef &field) {
-    if (field.value.type.enum_def)
-      return GenPrefixedTypeName(GenTypeName(field.value.type, true),
-                                 field.value.type.enum_def->file);
-    return GenTypeName(field.value.type, true);
+  std::string GetArgType(const FieldDef &field, bool allowNull) {
+    auto type_name = GenTypeName(field.value.type, true, allowNull && field.optional);
+
+    if (field.value.type.enum_def) {
+      if (IsScalar(field.value.type.base_type)) {
+        return GenPrefixedTypeName(type_name, field.value.type.enum_def->file);
+      }
+    }
+
+    return type_name;
   }
 
   static std::string GetArgName(const FieldDef &field) {
@@ -1372,12 +2139,10 @@
     return argname;
   }
 
-  std::string Verbose(const StructDef &struct_def,
-                      const char* prefix = "")
-  {
+  std::string Verbose(const StructDef &struct_def, const char *prefix = "") {
     return parser_.opts.js_ts_short_names ? "" : prefix + struct_def.name;
   }
-};
+};  // namespace jsts
 }  // namespace jsts
 
 bool GenerateJSTS(const Parser &parser, const std::string &path,
@@ -1389,11 +2154,12 @@
 std::string JSTSMakeRule(const Parser &parser, const std::string &path,
                          const std::string &file_name) {
   FLATBUFFERS_ASSERT(parser.opts.lang <= IDLOptions::kMAX);
-  const auto &lang = GetJsLangParams(parser.opts.lang);
 
   std::string filebase =
       flatbuffers::StripPath(flatbuffers::StripExtension(file_name));
-  std::string make_rule = GeneratedFileName(path, filebase, lang) + ": ";
+  jsts::JsTsGenerator generator(parser, path, file_name);
+  std::string make_rule =
+      generator.GeneratedFileName(path, filebase, parser.opts) + ": ";
 
   auto included_files = parser.GetIncludedFilesRecursive(file_name);
   for (auto it = included_files.begin(); it != included_files.end(); ++it) {