Want to know how it works

[nanfang2000]

First, great work! This is the most complete and natural reactive python implementation I ever seen.
However when I looked into the code, I did not notice any place that build the dependence tree for the state/model. Is that true or did I missed something?
As I know, unlike reactjs to rebuild the tree, the MobX only re-render the component that depends on the model. Children components would not be affect. Is my understanding correct?

Thanks!