Function breadthFirst

breadthFirst<T extends TraversableTree<TV> | TreeNode<TV>, TV>(
root: T,
depth?: number,
): IterableIterator<T>
Iterates over the children of root, breadth-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
- TextendsTraversableTree<TV> | TreeNode<TV>
- TV
Parameters
- root: T
  Root node
- depth: number = Number.MAX_SAFE_INTEGER
  How many levels to traverse
Returns IterableIterator<T>