Function appendChild

packages/core/src/render3/node_manipulation.ts:670–692

(
  tView: TView,
  lView: LView,
  childRNode: RNode | RNode[],
  childTNode: TNode,
)

 * @param childTNode The TNode of the child element
 */
export function appendChild(
  tView: TView,
  lView: LView,
  childRNode: RNode | RNode[],
  childTNode: TNode,
): void {
  const parentRNode = getParentRElement(tView, childTNode, lView);
  const renderer = lView[RENDERER];
  const parentTNode: TNode = childTNode.parent || lView[T_HOST]!;
  const anchorNode = getInsertInFrontOfRNode(parentTNode, childTNode, lView);
  if (parentRNode != null) {
    if (Array.isArray(childRNode)) {
      for (let i = 0; i < childRNode.length; i++) {
        nativeAppendOrInsertBefore(renderer, parentRNode, childRNode[i], anchorNode, false);
      }
    } else {
      nativeAppendOrInsertBefore(renderer, parentRNode, childRNode, anchorNode, false);
    }
  }

  _processI18nInsertBefore !== undefined &&
    _processI18nInsertBefore(renderer, childTNode, lView, childRNode, parentRNode);
}

/**
 * Returns the first native node for a given LView, starting from the provided TNode.