Function getChildren

packages/react-test-renderer/src/ReactTestRenderer.js:260–296

(parent: Fiber)

]);

function getChildren(parent: Fiber) {
  const children = [];
  const startingNode = parent;
  let node: Fiber = startingNode;
  if (node.child === null) {
    return children;
  }
  node.child.return = node;
  node = node.child;
  outer: while (true) {
    let descend = false;
    if (validWrapperTypes.has(node.tag)) {
      children.push(wrapFiber(node));
    } else if (node.tag === HostText) {
      if (__DEV__) {
        checkPropStringCoercion(node.memoizedProps, 'memoizedProps');
      }
      children.push('' + node.memoizedProps);
    } else {
      descend = true;
    }
    if (descend && node.child !== null) {
      node.child.return = node;
      node = node.child;
      continue;
    }
    while (node.sibling === null) {
      if (node.return === startingNode) {
        break outer;
      }
      node = (node.return: any);
    }
    (node.sibling: any).return = node.return;
    node = (node.sibling: any);
  }
  return children;
}

class ReactTestInstance {
  _fiber: Fiber;