Yifan focused on improving documentation quality across the webpack.js.org and ESLint repositories, addressing both accuracy and developer onboarding. They enhanced the webpack.js.org documentation by updating the externalsType code example to use module-import and correctly configure lodash as an external, ensuring the example matched actual module import behavior. In the ESLint repository, Yifan clarified how custom rule fixers should handle quote types in object keys, providing examples for both single and double quotes. Their work relied on JavaScript, Markdown, and code formatting skills, demonstrating careful attention to detail and cross-repository coordination to reduce support friction and improve contributor experience.