Personal blog of ASK

Finished TypeScript Pro Essentials course — quick notes

I recently completed the TypeScript Pro Essentials course by Matt Pocock, which turned out to be a solid, comprehensive deep dive into practical TypeScript. The material starts gently but quickly moves into territory that filled in several gaps I didn’t realize I had in my day-to-day work. The course helped me put clear names to patterns I already use, and it offered strong guidance on what to do—and what to avoid—when writing TypeScript. I especially appreciated the focus on type design: using utility types like Omit, Pick, and Partial with intention, creating stricter variants when necessary, and preferring discriminated unions over loose boolean flags. Another key takeaway was naming types based on what they represent rather than how they’re used, which leads to clearer, more maintainable code. On the advanced side, I’ll keep using template literal types to express constraints more precisely, such as defining an AbsoluteRoute type that enforces a leading slash. Overall, the course sharpened my mental model of TypeScript and gave me patterns I can apply immediately.