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<?php

declare(strict_types=1);

/*
 * This file is part of the league/config package.
 *
 * (c) Colin O'Dell <colinodell@gmail.com>
 *
 * For the full copyright and license information, please view the LICENSE
 * file that was distributed with this source code.
 */

namespace League\Config;

use League\Config\Exception\UnknownOptionException;
use League\Config\Exception\ValidationException;

/**
 * Interface for reading configuration values
 */
interface ConfigurationInterface
{
    /**
     * @param string $key Configuration option path/key
     *
     * @psalm-param non-empty-string $key
     *
     * @return mixed
     *
     * @throws ValidationException if the schema failed to validate the given input
     * @throws UnknownOptionException if the requested key does not exist or is malformed
     */
    public function get(string $key);

    /**
     * @param string $key Configuration option path/key
     *
     * @psalm-param non-empty-string $key
     *
     * @return bool Whether the given option exists
     *
     * @throws ValidationException if the schema failed to validate the given input
     */
    public function exists(string $key): bool;
}