[gldalmaso]

The worst experience I had refactoring JS was the need to change functions that were used elsewhere from plain to async. I really hoped to have had a strong IDE that could assure me the affected code was as intended and did not have the flow completely break because a promise was returned where none was expected before. I distinctively thought "I wish this was Java". Some of the affected code was already in Typescript and that did help a bit, but I was still not too confident because I still didn't trust the IDE completely (Typescript support was comparatively new).

I have even come to question if we should make all our javascript apis async from the start to avoid this scenario though it seems a rather extreme guideline. We didn't really do that, but I still dread this type of refactoring.