When does the Invisibility spell end: immediately before or immediately after you attack/cast a spell?

@JeremyECrawford When does the Invisibility spell end: immediately before or immediately after you attack/cast a spell?

— Armando Doval (@armando_doval) August 8, 2017

The invisibility spell is meant to end right after you make an attack or cast a spell. It doesn't predict what you're about to do! #DnD https://t.co/NPO8Yc6eE7

— Jeremy Crawford (@JeremyECrawford) August 8, 2017