Knowledge of HTML/CSS/JavaScript/React in Product design jobs?

In 98% of the product design jobs I see this requirement of knowing HTML,CSS, JavaScript and / React would be a plus. Or experience with these technologies. Does this mean we should code ? Can anybody please help me understand what is the designer expected to do with these skills ? And is this mandatory?

I am working as a Product designer from 1 and half years now, I never had any requirement to code. I would design and handover and front end designers and developers did the job. Coding is not my thing, so a little worried.