Function visit

packages/map2tree/src/index.ts:11–27

(
  parent: Node,
  visitFn: (parent: Node) => void,
  childrenFn: (parent: Node) => Node[] | undefined | null
)

}

function visit(
  parent: Node,
  visitFn: (parent: Node) => void,
  childrenFn: (parent: Node) => Node[] | undefined | null
) {
  if (!parent) return;

  visitFn(parent);

  const children = childrenFn(parent);
  if (children) {
    const count = children.length;
    for (let i = 0; i < count; i++) {
      visit(children[i], visitFn, childrenFn);
    }
  }
}

function getNode(tree: Node, key: string): Node | null {
  let node = null;