immutable

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 an immutable copy (ImmMap) of the current ImmMap

public function immutable(): ImmMap<Tk, Tv>;

This method is interchangeable with toImmMap().

Returns

• ImmMap<Tk,Tv> - an ImmMap representing a copy of the current ImmMap.

Examples

See Map::immutable for usage examples.