All files / src/utils getTypeAnnotation.js

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/*
 * Copyright (c) 2015, Facebook, Inc.
 * All rights reserved.
 *
 * This source code is licensed under the BSD-style license found in the
 * LICENSE file in the root directory of this source tree. An additional grant
 * of patent rights can be found in the PATENTS file in the same directory.
 *
 * @flow
 *
 */
 
import recast from 'recast';
const { types: { namedTypes: types } } = recast;
 
function hasTypeAnnotation(path: NodePath): boolean {
  return !!path.node.typeAnnotation;
}
 
/**
 * Gets the most inner valuable TypeAnnotation from path. If no TypeAnnotation
 * can be found nothing is returned
 */
export default function getTypeAnnotation(path: NodePath): ?NodePath {
  if (!hasTypeAnnotation(path)) return null;
 
  let resultPath: NodePath = path;
  do {
    resultPath = resultPath.get('typeAnnotation');
  } while (hasTypeAnnotation(resultPath) && !types.Type.check(resultPath.node));
 
  return resultPath;
}