[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

tests/ts/my-game/example/test-simple-table-with-enum.ts

@@ -0,0 +1,96 @@
+// automatically generated by the FlatBuffers compiler, do not modify
+
+import * as flatbuffers from 'flatbuffers';
+
+import { Color } from '../../my-game/example/color';
+
+
+export class TestSimpleTableWithEnum {
+  bb: flatbuffers.ByteBuffer|null = null;
+  bb_pos = 0;
+__init(i:number, bb:flatbuffers.ByteBuffer):TestSimpleTableWithEnum {
+  this.bb_pos = i;
+  this.bb = bb;
+  return this;
+}
+
+static getRootAsTestSimpleTableWithEnum(bb:flatbuffers.ByteBuffer, obj?:TestSimpleTableWithEnum):TestSimpleTableWithEnum {
+  return (obj || new TestSimpleTableWithEnum()).__init(bb.readInt32(bb.position()) + bb.position(), bb);
+}
+
+static getSizePrefixedRootAsTestSimpleTableWithEnum(bb:flatbuffers.ByteBuffer, obj?:TestSimpleTableWithEnum):TestSimpleTableWithEnum {
+  bb.setPosition(bb.position() + flatbuffers.SIZE_PREFIX_LENGTH);
+  return (obj || new TestSimpleTableWithEnum()).__init(bb.readInt32(bb.position()) + bb.position(), bb);
+}
+
+color():Color {
+  const offset = this.bb!.__offset(this.bb_pos, 4);
+  return offset ? this.bb!.readUint8(this.bb_pos + offset) : Color.Green;
+}
+
+mutate_color(value:Color):boolean {
+  const offset = this.bb!.__offset(this.bb_pos, 4);
+
+  if (offset === 0) {
+    return false;
+  }
+
+  this.bb!.writeUint8(this.bb_pos + offset, value);
+  return true;
+}
+
+static getFullyQualifiedName():string {
+  return 'MyGame.Example.TestSimpleTableWithEnum';
+}
+
+static startTestSimpleTableWithEnum(builder:flatbuffers.Builder) {
+  builder.startObject(1);
+}
+
+static addColor(builder:flatbuffers.Builder, color:Color) {
+  builder.addFieldInt8(0, color, Color.Green);
+}
+
+static endTestSimpleTableWithEnum(builder:flatbuffers.Builder):flatbuffers.Offset {
+  const offset = builder.endObject();
+  return offset;
+}
+
+static createTestSimpleTableWithEnum(builder:flatbuffers.Builder, color:Color):flatbuffers.Offset {
+  TestSimpleTableWithEnum.startTestSimpleTableWithEnum(builder);
+  TestSimpleTableWithEnum.addColor(builder, color);
+  return TestSimpleTableWithEnum.endTestSimpleTableWithEnum(builder);
+}
+
+serialize():Uint8Array {
+  return this.bb!.bytes();
+}
+
+static deserialize(buffer: Uint8Array):TestSimpleTableWithEnum {
+  return TestSimpleTableWithEnum.getRootAsTestSimpleTableWithEnum(new flatbuffers.ByteBuffer(buffer))
+}
+
+unpack(): TestSimpleTableWithEnumT {
+  return new TestSimpleTableWithEnumT(
+    this.color()
+  );
+}
+
+
+unpackTo(_o: TestSimpleTableWithEnumT): void {
+  _o.color = this.color();
+}
+}
+
+export class TestSimpleTableWithEnumT {
+constructor(
+  public color: Color = Color.Green
+){}
+
+
+pack(builder:flatbuffers.Builder): flatbuffers.Offset {
+  return TestSimpleTableWithEnum.createTestSimpleTableWithEnum(builder,
+    this.color
+  );
+}
+}