fixed invalid TS call and added test files (#6495)

e581013e3d broke TS generation - please don't use "replace" to refactor function names :)

tests/my-game/example/referrable.ts

@@ -0,0 +1,91 @@
+// automatically generated by the FlatBuffers compiler, do not modify
+
+import * as flatbuffers from 'flatbuffers';
+
+
+
+export class Referrable {
+  bb: flatbuffers.ByteBuffer|null = null;
+  bb_pos = 0;
+__init(i:number, bb:flatbuffers.ByteBuffer):Referrable {
+  this.bb_pos = i;
+  this.bb = bb;
+  return this;
+}
+
+static getRootAsReferrable(bb:flatbuffers.ByteBuffer, obj?:Referrable):Referrable {
+  return (obj || new Referrable()).__init(bb.readInt32(bb.position()) + bb.position(), bb);
+}
+
+static getSizePrefixedRootAsReferrable(bb:flatbuffers.ByteBuffer, obj?:Referrable):Referrable {
+  bb.setPosition(bb.position() + flatbuffers.SIZE_PREFIX_LENGTH);
+  return (obj || new Referrable()).__init(bb.readInt32(bb.position()) + bb.position(), bb);
+}
+
+id():flatbuffers.Long {
+  const offset = this.bb!.__offset(this.bb_pos, 4);
+  return offset ? this.bb!.readUint64(this.bb_pos + offset) : this.bb!.createLong(0, 0);
+}
+
+mutate_id(value:flatbuffers.Long):boolean {
+  const offset = this.bb!.__offset(this.bb_pos, 4);
+
+  if (offset === 0) {
+    return false;
+  }
+
+  this.bb!.writeUint64(this.bb_pos + offset, value);
+  return true;
+}
+
+static startReferrable(builder:flatbuffers.Builder) {
+  builder.startObject(1);
+}
+
+static addId(builder:flatbuffers.Builder, id:flatbuffers.Long) {
+  builder.addFieldInt64(0, id, builder.createLong(0, 0));
+}
+
+static endReferrable(builder:flatbuffers.Builder):flatbuffers.Offset {
+  const offset = builder.endObject();
+  return offset;
+}
+
+static createReferrable(builder:flatbuffers.Builder, id:flatbuffers.Long):flatbuffers.Offset {
+  Referrable.startReferrable(builder);
+  Referrable.addId(builder, id);
+  return Referrable.endReferrable(builder);
+}
+
+serialize():Uint8Array {
+  return this.bb!.bytes();
+}
+
+static deserialize(buffer: Uint8Array):Referrable {
+  return Referrable.getRootAsReferrable(new flatbuffers.ByteBuffer(buffer))
+}
+
+unpack(): ReferrableT {
+  return new ReferrableT(
+    this.id()
+  );
+}
+
+
+unpackTo(_o: ReferrableT): void {
+  _o.id = this.id();
+}
+}
+
+export class ReferrableT {
+constructor(
+  public id: flatbuffers.Long = flatbuffers.createLong(0, 0)
+){}
+
+
+pack(builder:flatbuffers.Builder): flatbuffers.Offset {
+  return Referrable.createReferrable(builder,
+    this.id
+  );
+}
+}