[TS/JS] New gen TS code gen (#6302)

* TS/ES6 modules spike iteration 1

* Initial modularized dasherized output

* Remove obsoleted parts and namespace wrapping

* Use _flatbuffers_ prefix

* First part of imports logic

* Second part of imports logic

* Fix TS/JS code removal mixup

* Alias imported symbols if same name from different namespaces and some fixes

* Use star import for bare imports

* Fix messed up string concat

* var to const and remove not needed semi

* Remove some cases of ns prefixing

* Add missing space

* Cleanups

* Completed initial import tracking logic

* Compilable output

* Adjust TypeScriptTest and dependents to work

* Use local flatbuffers package for tests

* Refactor away use of any

* Remove obsolete imported_fileset and reexport_map

* Still need any and fix JavaScriptTest.sh

* Fix test runs out of the box

* Temp add generated files

* TypeScriptTest replaces JavaScriptTest and cleanups

* Also remove reference to JavaScriptTest in TestAll.sh

* Remove old generated ts/js files

* Remove use of --js in generate_code scripts

* idl_gen_js_ts to idl_gen_ts and removal of js gen

* Remove obsoleted options

* Fix obsolete ts test detection

* Tweak ts compilation be as strict as possible

* Remove jsdoc type annotation generation

* Generated test ts files

* Fix search and replace messup

* Regenerated ts test output

* Use CharToLower

* Use normal for loop

* Rework namespacedir

* Revert "Rework namespacedir"

This reverts commit 6f4eb0104ceeb86011bb076ebca901138c48e068.

* Revert "Use normal for loop"

This reverts commit 676b2135bfaa1853dfbb06c92b5c16a0d81bb13a.

* Revert "Use CharToLower"

This reverts commit 2d08648d0d72d0af201fad80d54cdc76412b35e9.

* Again do rework but correct

* Avoid runtime cast

* Fix test runs

* Also add npm install to get tsc

* Bump node test versions

* for range to std for loop

* Clang format

* Missed one clang format

* Move accessor to later

* Attempt to make windows version of TypeScriptTest

* Want to see the output

* Try to get newer node at appveyor

* Style changes

3 files changed, 16 insertions, 22 deletions

diff --git a/include/flatbuffers/code_generators.h b/include/flatbuffers/code_generators.h
index d64ab03c..d1f7b5a4 100644
--- a/include/flatbuffers/code_generators.h
+++ b/include/flatbuffers/code_generators.h
@@ -94,7 +94,10 @@ class BaseGenerator {
   virtual bool generate() = 0;
 
   static std::string NamespaceDir(const Parser &parser, const std::string &path,
-                                  const Namespace &ns);
+                                  const Namespace &ns,
+                                  const bool dasherize = false);
+
+  static std::string ToDasherizedCase(const std::string pascal_case);
 
   std::string GeneratedFileName(const std::string &path,
                                 const std::string &file_name,
@@ -116,7 +119,8 @@ class BaseGenerator {
   BaseGenerator &operator=(const BaseGenerator &);
   BaseGenerator(const BaseGenerator &);
 
-  std::string NamespaceDir(const Namespace &ns) const;
+  std::string NamespaceDir(const Namespace &ns,
+                           const bool dasherize = false) const;
 
   static const char *FlatBuffersGeneratedWarning();
 
diff --git a/include/flatbuffers/idl.h b/include/flatbuffers/idl.h
index 1a0e4a0f..74d8bdc9 100644
--- a/include/flatbuffers/idl.h
+++ b/include/flatbuffers/idl.h
@@ -521,9 +521,6 @@ struct IDLOptions {
   // Use flexbuffers instead for binary and text generation
   bool use_flexbuffers;
   bool strict_json;
-  bool skip_js_exports;
-  bool use_goog_js_export_format;
-  bool use_ES6_js_export_format;
   bool output_default_scalars_in_json;
   int indent_step;
   bool output_enum_identifiers;
@@ -556,11 +553,8 @@ struct IDLOptions {
   bool binary_schema_comments;
   bool binary_schema_builtins;
   bool binary_schema_gen_embed;
-  bool skip_flatbuffers_import;
   std::string go_import;
   std::string go_namespace;
-  bool reexport_ts_modules;
-  bool js_ts_short_names;
   bool protobuf_ascii_alike;
   bool size_prefixed;
   std::string root_type;
@@ -580,7 +574,6 @@ struct IDLOptions {
     kCSharp = 1 << 1,
     kGo = 1 << 2,
     kCpp = 1 << 3,
-    kJs = 1 << 4,
     kPython = 1 << 5,
     kPhp = 1 << 6,
     kJson = 1 << 7,
@@ -621,9 +614,6 @@ struct IDLOptions {
       : gen_jvmstatic(false),
         use_flexbuffers(false),
         strict_json(false),
-        skip_js_exports(false),
-        use_goog_js_export_format(false),
-        use_ES6_js_export_format(false),
         output_default_scalars_in_json(false),
         indent_step(2),
         output_enum_identifiers(true),
@@ -653,9 +643,6 @@ struct IDLOptions {
         binary_schema_comments(false),
         binary_schema_builtins(false),
         binary_schema_gen_embed(false),
-        skip_flatbuffers_import(false),
-        reexport_ts_modules(true),
-        js_ts_short_names(false),
         protobuf_ascii_alike(false),
         size_prefixed(false),
         force_defaults(false),
@@ -1054,8 +1041,8 @@ extern bool GenerateJava(const Parser &parser, const std::string &path,
 
 // Generate JavaScript or TypeScript code from the definitions in the Parser
 // object. See idl_gen_js.
-extern bool GenerateJSTS(const Parser &parser, const std::string &path,
-                         const std::string &file_name);
+extern bool GenerateTS(const Parser &parser, const std::string &path,
+                       const std::string &file_name);
 
 // Generate Go files from the definitions in the Parser object.
 // See idl_gen_go.cpp.
@@ -1107,10 +1094,10 @@ extern std::string GenerateFBS(const Parser &parser,
 extern bool GenerateFBS(const Parser &parser, const std::string &path,
                         const std::string &file_name);
 
-// Generate a make rule for the generated JavaScript or TypeScript code.
-// See idl_gen_js.cpp.
-extern std::string JSTSMakeRule(const Parser &parser, const std::string &path,
-                                const std::string &file_name);
+// Generate a make rule for the generated TypeScript code.
+// See idl_gen_ts.cpp.
+extern std::string TSMakeRule(const Parser &parser, const std::string &path,
+                              const std::string &file_name);
 
 // Generate a make rule for the generated C++ header.
 // See idl_gen_cpp.cpp.
@@ -1169,7 +1156,7 @@ extern bool GenerateSwiftGRPC(const Parser &parser, const std::string &path,
                               const std::string &file_name);
 
 extern bool GenerateTSGRPC(const Parser &parser, const std::string &path,
-                             const std::string &file_name);
+                           const std::string &file_name);
 }  // namespace flatbuffers
 
 #endif  // FLATBUFFERS_IDL_H_
diff --git a/include/flatbuffers/util.h b/include/flatbuffers/util.h
index 2aafa482..7a3e12f3 100644
--- a/include/flatbuffers/util.h
+++ b/include/flatbuffers/util.h
@@ -51,6 +51,9 @@ inline bool is_alpha(char c) {
   return check_ascii_range(c & 0xDF, 'a' & 0xDF, 'z' & 0xDF);
 }
 
+// Check for uppercase alpha
+inline bool is_alpha_upper(char c) { return check_ascii_range(c, 'A', 'Z'); }
+
 // Check (case-insensitive) that `c` is equal to alpha.
 inline bool is_alpha_char(char c, char alpha) {
   FLATBUFFERS_ASSERT(is_alpha(alpha));