Saving the file does not save the changes made on localhost only until I build again. I'm on a fork where the other people using the same upstream do not encounter this issue. I reinstalled gulp, npm, node tried multiple versions - nothing works. Unfortunately, I have no clue what part of the script is messing this up so I can't include a snippet.
https://github.com/Miodec/monkeytype/blob/master/gulpfile.js
It looks like you have only create the watch task but didn't run it in your build command. You need to add the watch task in your build command. See the code below.
task("build", series("clean", "compile", "watch"));