doctrine is the JSDoc parser we use in docgen to get structured information out of the JSDoc comments. It was created and maintained by the ESLint people, although it's no longer actively developed. We should migrate out of doctrine for that reason.

The suggested replacement (eslint-plugin-jsoc) uses a different JSDoc parser with support for many other syntaxes (typescript, etc). We should look into trying jsdoctypeparser or any other that's actively developed.