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/**
* Copyright 2013-present, 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.
*
*
*/
'use strict';
var _prodInvariant = require('./reactProdInvariant');
var invariant = require('fbjs/lib/invariant');
/**
* Accumulates items that must not be null or undefined.
*
* This is used to conserve memory by avoiding array allocations.
*
* @return {*|array<*>} An accumulation of items.
*/
function accumulate(current, next) {
!(next != null) ? process.env.NODE_ENV !== 'production' ? invariant(false, 'accumulate(...): Accumulated items must be not be null or undefined.') : _prodInvariant('29') : void 0;
if (current == null) {
return next;
}
// Both are not empty. Warning: Never call x.concat(y) when you are not
// certain that x is an Array (x could be a string with concat method).
if (Array.isArray(current)) {
return current.concat(next);
}
if (Array.isArray(next)) {
return [current].concat(next);
}
return [current, next];
}
module.exports = accumulate;
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