All files / src/utils getParameterName.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';
 
import printValue from './printValue';
 
const {types: {namedTypes: types}} = recast;
 
export default function getParameterName(parameterPath: NodePath): string {
  switch (parameterPath.node.type) {
    case types.Identifier.name:
      return parameterPath.node.name;
    case types.AssignmentPattern.name:
      return getParameterName(parameterPath.get('left'));
    case types.ObjectPattern.name:
      return printValue(parameterPath);
    case types.RestElement.name:
      return '...' + getParameterName(parameterPath.get('argument'));
    default:
      throw new TypeError(
        'Parameter name must be an Identifier, an AssignmentPattern an ' +
        `ObjectPattern or a RestElement, got ${parameterPath.node.type}`
      );
  }
}