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/*!
 * is-accessor-descriptor <https://github.com/jonschlinkert/is-accessor-descriptor>
 *
 * Copyright (c) 2015, Jon Schlinkert.
 * Licensed under the MIT License.
 */

'use strict';

var typeOf = require('kind-of');

// accessor descriptor properties
var accessor = {
  get: 'function',
  set: 'function',
  configurable: 'boolean',
  enumerable: 'boolean'
};

function isAccessorDescriptor(obj, prop) {
  if (typeof prop === 'string') {
    var val = Object.getOwnPropertyDescriptor(obj, prop);
    return typeof val !== 'undefined';
  }

  if (typeOf(obj) !== 'object') {
    return false;
  }

  if (has(obj, 'value') || has(obj, 'writable')) {
    return false;
  }

  if (!has(obj, 'get') || typeof obj.get !== 'function') {
    return false;
  }

  // tldr: it's valid to have "set" be undefined
  // "set" might be undefined if `Object.getOwnPropertyDescriptor`
  // was used to get the value, and only `get` was defined by the user
  if (has(obj, 'set') && typeof obj[key] !== 'function' && typeof obj[key] !== 'undefined') {
    return false;
  }

  for (var key in obj) {
    if (!accessor.hasOwnProperty(key)) {
      continue;
    }

    if (typeOf(obj[key]) === accessor[key]) {
      continue;
    }

    if (typeof obj[key] !== 'undefined') {
      return false;
    }
  }
  return true;
}

function has(obj, key) {
  return {}.hasOwnProperty.call(obj, key);
}

/**
 * Expose `isAccessorDescriptor`
 */

module.exports = isAccessorDescriptor;