immutable-js/src/util/assert.js

Immutable types in JavaScript

/**
 *  Copyright (c) 2015, Jan Biasi.
 *  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.
 */

import invariant from './invariant'

export function assertNotInfinite(size) {
    invariant(
        size !== Infinity,
        'Can\'t perform this action with an infinite size.'
    );
}

export function assertNotZeroLength(seq) {
    invariant(
        !!(seq.length ? seq.length > 0 : (seq.size ? seq.size > 0 : false)),
        'Sequence must contain any items to perform this action.'
    )
}