Connie Ooi contributed to the cfug/dart.cn repository by enhancing documentation and improving input handling for Dart-JS interop features. She addressed a documentation bug in the add-commands section, ensuring clarity and correcting misspellings, while also enforcing null safety for the searchWikipedia function to prevent runtime issues. Connie expanded the Dart-JS interop primitives documentation, adding detailed guidance on JSSymbol and JSBigInt to clarify the type hierarchy for developers. Her work, primarily using Dart and Markdown, focused on reducing ambiguity and supporting maintainability. The updates provided clear code examples and improved onboarding for developers working with Dart and JavaScript interoperability.