function getKey(context, node) {
  if (node.type === 'ObjectTypeProperty') {
    return getSourceCode(context).getFirstToken(node).value;
  }
  if (node.key && node.key.value) {
    return node.key.value;
  }
  return getText(context, node.key || node.argument);
}
@fileoverview Enforce propTypes declarations alphabetical sorting