Function deepScan

src/core/context/scan.js:42–59

(
  startNode,
  callback,
  arg = undefined,
  state = /** @type {S} */ (/** @type {?} */ (true)),
  includeSelf = true
)

 * @template S
 */
export function deepScan(
  startNode,
  callback,
  arg = undefined,
  state = /** @type {S} */ (/** @type {?} */ (true)),
  includeSelf = true
) {
  if (includeSelf) {
    const newState = callback(startNode, arg, state);
    if (newState) {
      deepScan(startNode, callback, arg, newState, false);
    }
  } else if (startNode.children) {
    for (const node of startNode.children) {
      deepScan(node, callback, arg, state, true);
    }
  }
}