The author discusses how they converted their Node.js library to Deno using a runtime adapter pattern. They highlight the key differences between Node.js and Deno, such as TypeScript support, module resolution, standard libraries, and built-in globals. To adapt their library for Deno, they rewrote import paths, swapped out imports from the Node.js standard library with Deno equivalents, and injected Node.js globals into the Deno-ified code. They also wrote a script using Deno to automate these changes. The author suggests that this approach can be useful for other library authors looking to support Deno.