Picture would help.

I am in the planning stages of a bathroom, so no photos, but thanks for the information.

Why ? IMO a sconce it that space no matter how narrow is the wrong choice for lighting. At least post a pic of the plan on paper.

This is the plan - the vanity has to shift all the way over to the wall to meet code, which is why there is only 3 inches of space between the edge of the sink and the wall. What is my best option? Over the vanity light bar or pendants?

Just have to select the appropriate sized mirror/lighting (above or pendants).

I had a similar situation in my bathroom remodel. I installed a mirror whose left and right edges lined up with the left and right edges of the vanity. I installed a 48" wide Tech Lighting Lufe fixture over the mirror but there are a bazillion other such fixtures. Use a dimmer.

mirror mount the light fixtures or hang from above, why fight it lol.

Maureen - do you think a pendant light would cast a shadow?

Sorry Bob, I can’t say but perhaps someone who has pendants could advise.