Function depthFirst

depthFirst<T>(root): Generator<T>
Iterates over children of root, depth-first.

Other iteration options:
- breadthFirst: Children, breadth-first
- depthFirst: Children, depth-first
- parents: Chain of parents, starting with immediate parent
- siblings: Nodes with same parent
Type Parameters
- T extends TraversableTree<any>
Parameters
- root: T
  Root node
Returns Generator<T>