I managed to make sketchnotes of a lot of the talks and want to share them with you. If you would love to get them in a higher resolution or have any other question or comment, feel free to contact me.
Here are the sketchnotes of JS Nation 2019:
Securing the DOM from the Bottom Up
Testing Tools and Their Friends
Christina Zenzens and Anna Backs
The Working Architecture of Node.js Applications
Building Zero-Knowledge Backends
10 things I learned making the fastest JS server runtime in the world
Error handling: doing it right!
Ready, Steady, Crash!
Automated Performance Testing With WebDriver