function depthFirstTraversalimport { depthFirstTraversal } from "https://deno.land/x/pagic@v1.6.1/src/utils/mod.ts"; depthFirstTraversal<T>(tree: Tree<T> | Tree<T>[], callback: (item: T) => void)Traversal a tree or tree[] Type ParametersTParameterstree: Tree<T> | Tree<T>[]callback: (item: T) => void