simplepie / simplepie-ng

src/Enum/Serialization.php

<?php
/**
 * Copyright (c) 2017–2019 Ryan Parman <http://ryanparman.com>.
 * Copyright (c) 2017–2019 Contributors.
 *
 * http://opensource.org/licenses/Apache2.0
 */

declare(strict_types=1);

namespace SimplePie\Enum;

/**
 * Provides a set of known, allowable serializations of content nodes.
 */
class Serialization extends AbstractEnum

The type SimplePie\Enum\AbstractEnum was not found. Maybe you did not declare it correctly or list all dependencies?

{
    public const TEXT = 'text';

    public const HTML = 'html';

    public const XHTML = 'xhtml';
}