traverse

See source on Github 

Recursively traverses an object tree and collects each visited node.

The returned array always includes the current obj first. If obj[key] is an iterable, each entry is traversed recursively using the same key.

• @param obj - The object to start traversing from.
• @param key - The property key that contains child entries to traverse.
• @returns An array containing the current object and all recursively reachable descendants.

Example

const tree = {
  id: 'root',
  children: [
    { id: 'a', children: [] },
    { id: 'b', children: [{ id: 'c', children: [] }] },
  ],
}
 
const ids = traverse(tree, 'children').map((node) => node.id)
// ['root', 'a', 'b', 'c']