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8a12695 | 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 | import { GoogleGenAI } from "@google/genai";
import dotenv from "dotenv";
dotenv.config();
const GEMINI_API_KEY = process.env.GEMINI_API_KEY;
const GEMINI_MODEL = process.env.GEMINI_MODEL || "gemini-2.0-flash-exp";
if (!GEMINI_API_KEY) {
console.warn("GEMINI_API_KEY not found in environment variables");
}
const ai = new GoogleGenAI({});
export interface GeminiResponse {
text: string;
usage?: {
promptTokens?: number;
candidatesTokens?: number;
totalTokens?: number;
};
}
export interface GeminiStreamChunk {
text: string;
done: boolean;
}
export async function generateContent(
prompt: string,
systemInstruction?: string,
images?: string[]
): Promise<GeminiResponse> {
try {
if (!GEMINI_API_KEY) {
throw new Error("GEMINI_API_KEY is not configured");
}
const contents: any[] = [];
if (images && images.length > 0) {
const imageParts = images.map((image) => {
if (image.startsWith("data:")) {
const [header, base64Data] = image.split(",");
const mimeType = header.match(/data:([^;]+)/)?.[1] || "image/jpeg";
return {
inlineData: {
data: base64Data,
mimeType: mimeType,
},
};
} else {
return {
fileData: {
fileUri: image,
mimeType: "image/jpeg",
},
};
}
});
contents.push({
role: "user",
parts: [
{ text: prompt },
...imageParts,
],
});
} else {
contents.push({
role: "user",
parts: [{ text: prompt }],
});
}
const fullPrompt = systemInstruction
? `${systemInstruction}\n\n${prompt}`
: prompt;
if (images && images.length > 0) {
contents[0].parts[0].text = fullPrompt;
}
const response = await ai.models.generateContent({
model: GEMINI_MODEL,
contents: images && images.length > 0 ? contents : fullPrompt,
});
const text = response.text || "";
const usage = response.usageMetadata
? {
promptTokens: response.usageMetadata.promptTokenCount,
candidatesTokens: response.usageMetadata.candidatesTokenCount,
totalTokens: response.usageMetadata.totalTokenCount,
}
: undefined;
return {
text,
usage,
};
} catch (error: any) {
console.error("Gemini API error:", error);
throw new Error(
error.message || "Failed to generate content with Gemini"
);
}
}
export async function* generateContentStream(
prompt: string,
systemInstruction?: string,
images?: string[]
): AsyncGenerator<GeminiStreamChunk, void, unknown> {
try {
if (!GEMINI_API_KEY) {
throw new Error("GEMINI_API_KEY is not configured");
}
const contents: any[] = [];
if (images && images.length > 0) {
const imageParts = images.map((image) => {
if (image.startsWith("data:")) {
const [header, base64Data] = image.split(",");
const mimeType = header.match(/data:([^;]+)/)?.[1] || "image/jpeg";
return {
inlineData: {
data: base64Data,
mimeType: mimeType,
},
};
} else {
return {
fileData: {
fileUri: image,
mimeType: "image/jpeg",
},
};
}
});
contents.push({
role: "user",
parts: [
{ text: prompt },
...imageParts,
],
});
} else {
contents.push({
role: "user",
parts: [{ text: prompt }],
});
}
const fullPrompt = systemInstruction
? `${systemInstruction}\n\n${prompt}`
: prompt;
if (images && images.length > 0) {
contents[0].parts[0].text = fullPrompt;
}
const stream = await ai.models.generateContentStream({
model: GEMINI_MODEL,
contents: images && images.length > 0 ? contents : fullPrompt,
});
for await (const chunk of stream) {
const text = chunk.text || "";
if (text) {
yield {
text,
done: false,
};
}
}
yield {
text: "",
done: true,
};
} catch (error: any) {
console.error("Gemini streaming error:", error);
throw new Error(
error.message || "Failed to stream content with Gemini"
);
}
}
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