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

node_modules/@zxing/library/es2015/browser/BrowserBarcodeReader.d.ts

@@ -0,0 +1,15 @@
+import { BrowserCodeReader } from './BrowserCodeReader';
+import DecodeHintType from '../core/DecodeHintType';
+/**
+ * @deprecated Moving to @zxing/browser
+ *
+ * Barcode reader reader to use from browser.
+ */
+export declare 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?: number, hints?: Map<DecodeHintType, any>);
+}