Stop process from crashing if folder doesn't exist

[TheColorRed]

I am running the following command (split into multiple lines for readability):

watch 
"uglifyjs --compress --mangle --output ./lib/hp.min.js -- ./lib/hp.js" 
./lib/ --interval=1 --wait=5

When I build my project for the first time or just delete the lib directory completely and restart the process, I get an error that the directory doesn't exist which is true. It also crashes the process requiring it to have to be ran a second time.

Error: ENOENT: no such file or directory, stat 'C:...\lib'

Is there a way to either delay watching of the directory for x seconds or just wait until the directory is created?