findUids.js

function findUids(node) {
  let depth = 0;
  const MAX_DEPTH = 10;
  const uids = [];
  const table = {};
  (function traverse(node) {
    if (typeof node !== "object") { return; }  // only permit objects

    if (depth > MAX_DEPTH) {
      console.error(new Error(`Exception: Tree to Deep! depth: ${depth}`));
      return;
    }
    depth++;

    if (Array.isArray(node)) { // traverse array entries first
      for (let i = 0; i < node.length; i++) {
        traverse(node[i]), depth--;
      }
      return;
    }

    const keys = Object.keys(node);
    for (let i = 0; i < keys.length; i++) {
      const key = keys[i];
      const val = node[key];

      if (key === "uid" && typeof val === "string" && val.length) {
        uids.push(val);
        table[val] = node;
      }
      
      if (Array.isArray(val) || key === "configs") {
        traverse(val), depth--;
      }
    }
  })(node);
  return { uids, table };
}