'use strict';

Object.defineProperty(exports, '__esModule', { value: true });

var index = require('../is-extendable/index.js');
var index$1 = require('../arr-union/index.js');
var index$4 = require('../get-value/index.js');
var index$5 = require('../set-value/index.js');

var unionValue = function unionValue(obj, prop, value) {
  if (!index.default(obj)) {
    throw new TypeError('union-value expects the first argument to be an object.');
  }

  if (typeof prop !== 'string') {
    throw new TypeError('union-value expects `prop` to be a string.');
  }

  var arr = arrayify(index$4.default(obj, prop));
  index$5.default(obj, prop, index$1.default(arr, arrayify(value)));
  return obj;
};

function arrayify(val) {
  if (val === null || typeof val === 'undefined') {
    return [];
  }
  if (Array.isArray(val)) {
    return val;
  }
  return [val];
}

exports.__moduleExports = unionValue;
exports.default = unionValue;
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