Add barcode-detector-api-polyfill dependency and update environment variable declarations in SvelteKit project

node_modules/@zxing/library/es2015/browser/BrowserBarcodeReader.js

@@ -0,0 +1,17 @@
+import { BrowserCodeReader } from './BrowserCodeReader';
+import MultiFormatOneDReader from '../core/oned/MultiFormatOneDReader';
+/**
+ * @deprecated Moving to @zxing/browser
+ *
+ * Barcode reader reader to use from browser.
+ */
+export class BrowserBarcodeReader extends BrowserCodeReader {
+    /**
+     * Creates an instance of BrowserBarcodeReader.
+     * @param {number} [timeBetweenScansMillis=500] the time delay between subsequent decode tries
+     * @param {Map<DecodeHintType, any>} hints
+     */
+    constructor(timeBetweenScansMillis = 500, hints) {
+        super(new MultiFormatOneDReader(hints), timeBetweenScansMillis, hints);
+    }
+}