Pipe

:::info[Note] This is a point-in-time snapshot of the API documentation from January 2026. Going forward, we will not be maintaining a public copy of these references, and recommend users to refer to the built-in signature helpers available in the Hack LSP instead for complete and up-to-date information. :::

Create a pair of handles, where writes to the WriteHandle can be read from the ReadHandle

namespace HH\Lib\IO;

function pipe(): (CloseableReadFDHandle, CloseableWriteFDHandle);

Returns

• (CloseableReadFDHandle, CloseableWriteFDHandle)