Improve TS types to support isolatedModules and isolatedDeclarations

tests/ts/even-more-struct.ts

@@ -0,0 +1,64 @@
+// automatically generated by the FlatBuffers compiler, do not modify
+
+/* eslint-disable @typescript-eslint/no-unused-vars, @typescript-eslint/no-explicit-any, @typescript-eslint/no-non-null-assertion */
+
+import * as flatbuffers from 'flatbuffers';
+
+
+
+export class EvenMoreStruct implements flatbuffers.IUnpackableObject<EvenMoreStructT> {
+  bb: flatbuffers.ByteBuffer|null = null;
+  bb_pos: number = 0;
+  __init(i:number, bb:flatbuffers.ByteBuffer):EvenMoreStruct {
+  this.bb_pos = i;
+  this.bb = bb;
+  return this;
+}
+
+g(index: number):bigint|null {
+    return this.bb!.readInt64(this.bb_pos + 0 + index * 8);
+}
+
+static getFullyQualifiedName(): "EvenMoreStruct" {
+  return 'EvenMoreStruct';
+}
+
+static sizeOf():number {
+  return 16;
+}
+
+static createEvenMoreStruct(builder:flatbuffers.Builder, g: bigint[]):flatbuffers.Offset {
+  builder.prep(8, 16);
+
+  for (let i = 1; i >= 0; --i) {
+    builder.writeInt64(BigInt(g?.[i] ?? 0));
+  }
+
+  return builder.offset();
+}
+
+
+unpack(): EvenMoreStructT {
+  return new EvenMoreStructT(
+    this.bb!.createScalarList<bigint>(this.g.bind(this), 2)
+  );
+}
+
+
+unpackTo(_o: EvenMoreStructT): void {
+  _o.g = this.bb!.createScalarList<bigint>(this.g.bind(this), 2);
+}
+}
+
+export class EvenMoreStructT implements flatbuffers.IGeneratedObject {
+constructor(
+  public g: (bigint)[] = []
+){}
+
+
+pack(builder:flatbuffers.Builder): flatbuffers.Offset {
+  return EvenMoreStruct.createEvenMoreStruct(builder,
+    this.g
+  );
+}
+}