export declare function guessMimeType(filePath: string, fallback?: string): string;
/** Encode bytes as a Data URL (`data:image/png;base64,...`). */
export declare function bufferToDataUrl(data: Buffer, mimeType: string): string;
/** Read a local image and return a Data URL suitable for Lux3D `img` fields. */
export declare function fileToDataUrl(filePath: string, mimeType?: string): Promise<string>;
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