This talk was recorded at NDC Copenhagen in Copenhagen, Denmark. #ndccopenhagen #ndcconferences #developer #softwaredeveloper    

Attend the next NDC conference near you: 
https://ndcconferences.com
https://ndccopenhagen.com/

Subscribe to our YouTube channel and learn every day:   
/        @NDC 

Follow our Social Media!

https://www.facebook.com/ndcconferences
https://twitter.com/NDC_Conferences
https://www.instagram.com/ndc_conferences/

#microsoft #web #typescript 

It’s been over a decade since TypeScript was released and by this point it is has become industry standard.
In this session we will deep dive into TypeScript from a few aspects.
We will start by drawing the line between dev time and runtime, and understand transpilation and how does it work.
Next we will review Zod in a live coding session and see different strategies for building “bridges” between runtime and dev time, we will go into some common (and exotic) TypeScript patterns that can improve any codebase.
Last but not least we will look forward on the future of TypeScript- the current porting to Go and the new compiler to be released in just a few months- what special strategy was chosen, why was it needed and how it is going to improve our DX.
This talk is for all levels of TS lovers- beginner to master, all can find valuable insights in this session.

NDC Conferences

TypeScript provides compile-time type safety but doesn't protect against runtime errors from external data sources like APIs. The TypeScript compiler works through four phases: parsing code into an Abstract Syntax Tree, binding references, type checking through tree traversal, and emitting JavaScript. Runtime validation libraries like Zod solve the gap between TypeScript's static types and runtime data by providing schema validation with automatic type inference. Advanced patterns like discriminated unions, nominal typing with symbols, and environment variable validation improve type safety. TypeScript is being rewritten in Go to achieve 10x performance improvements, addressing scalability issues in large codebases where JavaScript's limitations become apparent.

Typescript. Runtime. And in Between. - Ariel Shulman - NDC Copenhagen 2025