/**
 * High-sensitivity pure-JS @zxing decode (the library that previously worked).
 * Multi-pass digital zoom + TRY_HARDER for distant / small codes.
 */
import { BrowserMultiFormatReader } from '@zxing/browser';
import { BarcodeFormat } from '@zxing/library';
export declare function createSensitiveZxingReader(formats: readonly BarcodeFormat[]): BrowserMultiFormatReader;
/**
 * Decode one video frame via multi-pass canvas crops → @zxing decodeFromCanvas.
 * Returns the first payload or null when nothing is found.
 */
export declare function decodeVideoFrameWithZxingJs(video: HTMLVideoElement, canvas: HTMLCanvasElement, reader: BrowserMultiFormatReader): string | null;
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