Rx

:::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. :::

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 {...}