Without the decorator sugar, the core algorithm of MobX is also 60 LOC. The author goes through it line by line here: https://youtu.be/TfxfRkNCnmk?t=15m59s ht

Without the decorator sugar, the core algorithm of MobX is also 60 LOC. The author goes through it line by line here: https://youtu.be/TfxfRkNCnmk?t=15m59s https://youtu.be/TfxfRkNCnmk?t=15m59s It looked "magical" and tripped up my "too good to be true and I'll have problems later" sensor. Then I looked at that video and realised the idea is rather simple and brilliant.