OrbitalControls -> Allow mouse control to be null

[alexpineda]

When using TypeScript the mouse control is not allowed to be nullable when in fact I wish to not have any control for that mouse button.

The typescript definition should allow MOUSE | undefined | null

[joshuaellis]

Is this allowed in three.js?

[alexpineda]

Yes.

https://github.com/mrdoob/three.js/blob/dev/examples/jsm/controls/OrbitControls.js#L953

It sets state to none if the switch case does not match any MOUSE enum.

[Lutymane]

Maybe better do?

mouseButtons: Partial<{ LEFT: MOUSE; MIDDLE: MOUSE; RIGHT: MOUSE }>;