DefinitelyTyped with git sparse-checkout

$ git clone --filter=blob:none --no-checkout --depth=1 https://github.com/DefinitelyTyped/DefinitelyTyped

(後はリポジトリ内)

$ git sparse-checkout set types/<packagename>

$ git checkout

$ pnpm install

あとは types/<packagename> 内をいじって pnpm test <packagename>