export function addFileWithDedup(state, fileNode) {
  const accept = (node) => {
    if (node.kind === 'file') {
      const key = `${node.path}\u0000${node.file.size}`;
      if (state.fileMeta.has(key)) return null;
      state.fileMeta.set(key, node.id);
      return node;
    }
    node.children = node.children.map(accept).filter(Boolean);
    return node.children.length ? node : null;
  };
  const accepted = accept(fileNode);
  if (!accepted || (accepted.kind !== 'file' && !accepted.children.length)) return false;
  state.nodes.push(accepted);
  return true;
}