/**
 * Converts an image file to JPEG using the browser's native decoder and canvas.
 *
 * Tries three decoding strategies:
 * 1. createImageBitmap() + OffscreenCanvas (works in Safari, future Chrome).
 * 2. WebCodecs ImageDecoder API (uses platform codecs; may work in future
 *    Chrome if HEIC is added to its image decoder pipeline).
 * 3. HEIC container parsing + WebCodecs VideoDecoder (Chrome 107+ on macOS).
 *    Parses the HEIC/ISOBMFF container to extract the HEVC bitstream, then
 *    decodes it using Chrome's platform HEVC video decoder (hardware-
 *    accelerated via macOS VideoToolbox).
 *
 * This avoids shipping our own HEVC decoder, sidestepping patent/licensing concerns.
 *
 * @param file    Source image file (e.g., HEIC/HEIF).
 * @param quality JPEG quality (0-1). Default 0.82.
 * @return JPEG File object.
 */
export declare function canvasConvertToJpeg(file: File, quality?: number): Promise<File>;
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