@marrocode/ns-ai-kit/providers/gemini.js

AI Kit for NativeScript

import { HttpClient, HttpError } from '../core/http-client';
export class GeminiAPI {
    /**
     * Initializes the GeminiAPI client.
     * @param apiKey Your Google AI API key.
     * @param baseUrl The base URL for the Gemini API. Defaults to the official endpoint.
     */
    constructor(apiKey, baseUrl = 'https://generativelanguage.googleapis.com/v1beta') {
        this.apiKey = apiKey;
        this.httpClient = new HttpClient(baseUrl);
    }
    /**
     * Generates a chat completion response from the Gemini model.
     * @param {object} params The parameters for the chat completion.
     * @param {GeminiMessage[]} params.messages The history of the conversation.
     * @param {string} [params.model] The model to use (e.g., 'models/gemini-pro').
     * @returns A promise that resolves with the model's response.
     * @throws {HttpError} If the API returns an error.
     */
    async chatCompletion({ messages, model = 'models/gemini-pro' }) {
        // 1. Transform messages to the format required by the Gemini API.
        const contents = messages.map((msg) => ({
            role: msg.role,
            parts: [{ text: msg.content }],
        }));
        // 2. Define the specific API path and the request body.
        const path = `/models/gemini-2.0-flash:generateContent?key=${this.apiKey}`;
        const body = { contents };
        try {
            // 3. Delegate the POST request to our robust HttpClient.
            const response = await this.httpClient.post(path, body);
            return response;
        }
        catch (error) {
            // 4. (Optional but recommended) Catch the specific HttpError for better logging.
            if (error instanceof HttpError) {
                console.error(`[Gemini API Error] Status: ${error.statusCode}, Message: ${error.message}`, error.responseData);
            }
            else {
                console.error('[Gemini API Error] An unexpected error occurred:', error);
            }
            // Re-throw the error so the calling code can handle it.
            throw error;
        }
    }
}
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