Rx

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.

The core capability present in every reactive context

Each weaker level of reactive context has additional privileges, thus the respective capabilities are subtypes of this one.

Interface Synopsis

namespace HH\Capabilities;

interface Rx {...}