at
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.
Returns the value of the field $index of $shape, throws if the field is missing
public static function at(
shape() $shape,
arraykey $index,
);
Use this to access optional fields on shapes.
Parameters
shape() $shapearraykey $index