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<?php
namespace Amp\ByteStream;
use Amp\Promise;
/**
* An `InputStream` allows reading byte streams in chunks.
*
* **Example**
*
* ```php
* function readAll(InputStream $in): Promise {
* return Amp\call(function () use ($in) {
* $buffer = "";
*
* while (($chunk = yield $in->read()) !== null) {
* $buffer .= $chunk;
* }
*
* return $buffer;
* });
* }
* ```
*/
interface InputStream
{
/**
* Reads data from the stream.
*
* @return Promise Resolves with a string when new data is available or `null` if the stream has closed.
*
* @psalm-return Promise<string|null>
*
* @throws PendingReadError Thrown if another read operation is still pending.
*/
public function read(): Promise;
}