Interface ChatCompletionChunk

interface ChatCompletionChunk {
    id: string;
    object: "chat.completion.chunk";
    created: number;
    model: string;
    choices: {
        index: number;
        delta: {
            role?: ChatRole;
            content?: string;
            tool_calls?: {
                index: number;
                id?: string;
                type?: "function";
                function?: { name?: string; arguments?: string };
            }[];
        };
        finish_reason?: null
        | string;
    }[];
}