TypeScript fromChatMessages does not properly interpret function_calls

[ryankashi]

const chatMessages: Message[] = [
	{ role: 'user', content: 'What is the weather?' },
	{
		role: 'assistant',
		content: null,
		toolCalls: [
			{
				id: 'call_123',
				type: 'function',
				function: { name: 'get_weather', arguments: '{"location":"Paris"}' }
			}
		]
	},
	{
		role: 'tool',
		toolCallId: 'call_123',
		content: '{"temperature": 20}'
	}
];
const input = fromChatMessages(chatMessages);
console.log('got input:');
console.log(input);

this prints:

got input:
[
  { role: 'user', content: 'What is the weather?' },
  { role: 'assistant', content: '' },
  {
    type: 'function_call_output',
    callId: 'call_123',
    output: '{"temperature": 20}'
  }
]

Instead, it should print:

[
  { role: 'user', content: 'What is the weather?' },
  { type: 'function_call', name: 'get_weather', arguments: '{"location":"Paris"}' , callId: 'call_123' },
  {
    type: 'function_call_output',
    callId: 'call_123',
    output: '{"temperature": 20}'
  }
]

Notice how the tool_call message is improperly converted to a blank assistant message when instead it should be converted to a function_call. This breaks Agentic loops that want to call LLMs using openRouter.callModel, since the input tool request is not properly created.