Function fileToGenerativePart

ai/ai-react-app/src/utils/fileUtils.ts:11–49

(file: File)

 * @throws An error if the file cannot be read or processed.
 */
export async function fileToGenerativePart(file: File): Promise<Part> {
  const base64EncodedDataPromise = new Promise<string>((resolve, reject) => {
    const reader = new FileReader();
    reader.onloadend = () => {
      // The FileReader result includes the Data URL prefix (e.g., "data:image/jpeg;base64,").
      // We only need the actual base64 data part after the comma.
      const base64String = reader.result as string;
      if (base64String && base64String.includes(",")) {
        resolve(base64String.split(",")[1]);
      } else {
        reject(new Error("Invalid file data format received from FileReader."));
      }
    };
    reader.onerror = (errorEvent) => {
      reject(
        new Error(
          `FileReader error: ${errorEvent?.target?.error?.message || "Unknown error"}`,
        ),
      );
    };
    // Start reading the file
    reader.readAsDataURL(file);
  });

  try {
    const base64EncodedData = await base64EncodedDataPromise;
    return {
      inlineData: {
        data: base64EncodedData,
        mimeType: file.type,
      },
    };
  } catch (error) {
    console.error("Error converting file to Generative Part:", error);
    throw new Error(
      `Failed to process the file "${file.name}". Please ensure it's a valid file.`,
    );
  }
}