RadixToggleGroup.Root has incorrect `onValueChange` handler type

[DenisBratchikov]

Bug report

According to the latest main (as of 05.11.2025)

primitives/packages/react/toggle-group/src/toggle-group.tsx

Line 79 in 2bab24a

onValueChange?(value: string): void;

the onValueChange handler has onValueChange?(value: string): void; type.
However, RadixToggle allows deselecting currently active selected element which means the handler provides undefined value, which is not listed in the handler arguments.

Current Behavior

onValueChange?(value: string): void; provides undefined value in some cases

Expected behavior

onValueChange?(value?: string): void; or onValueChange?(value: string | undefined): void;

Reproducible example

Not needed - the example for deselecting and how to deal with it (e.g. ensuring selection) listed in https://www.radix-ui.com/primitives/docs/components/toggle-group#ensuring-there-is-always-a-value

Suggested solution

Update the type definition

Additional context

N/A

Your environment

N/A

Software	Name(s)	Version
Radix Package(s)	@radix-ui/react-toggle-group	^1.1.10