missing 'modalities'

[lava-hammer]

I see in offical doc, there is a code sample for image generation:

const openRouter = new OpenRouter({
--
apiKey: '<OPENROUTER_API_KEY>',
});
 
const result = await openRouter.chat.send({
model: 'google/gemini-2.5-flash-image-preview',
messages: [
{
role: 'user',
content: 'Generate a beautiful sunset over mountains',
},
],
modalities: ['image', 'text'],
stream: false,
});

while I copied the code, the type checker complains, there is no type define for 'modalities'

SDK VERSION: 0.3.11