Guidance on reducing heap usage of large typings?

I maintain google/schema-dts which generates typings for schema.org JSON-LD. The generated typings are ~10k loc and involves a lot of type unions (e.g. Thing can be Organization or CreativeWork or Person or ...), and these can get pretty nested.

Compiling these works for me and the vast majority of users. But I get constant reports of JavaScript heap OOM errors from users consuming the typings. See google/schema-dts#34. I haven't been able to repro this at all, but I'm still hoping for some guidance on getting a better memory footprint for the type checker.

FYI, the .d.ts file looks something like this: https://unpkg.com/schema-dts@0.5.1/schema.d.ts

Questions (I'd take answers to any of these):

1. Are there better strategies for writing these in a more memory friendly way? e.g. naming intermediate types, or declaring all properties in one huge object and defining respective types in terms of Pick<>?
2. Are there any profiling tools that anyone would recommend using to track this down?
3. any other advice is appreciated.

Unfortunately splitting the types up isn't an option (at least not obviously) because the types are deeply self referential.

まず schema-dts#34 と、レポートにリンクされている生成済み schema.d.ts の例を確認してください。この issue には TypeScript のソースエントリポイント、再現可能なプロジェクト、または失敗するテストが記載されていません。確認済みの再現手順と、メモリ効率のよい宣言パターンまたはプロファイリングに関する具体的な指針が得られれば、有用な成果となります。