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

node_modules/@zxing/library/es2015/browser/BrowserPDF417Reader.js

@@ -0,0 +1,16 @@
+import { BrowserCodeReader } from './BrowserCodeReader';
+import PDF417Reader from '../core/pdf417/PDF417Reader';
+/**
+ * @deprecated Moving to @zxing/browser
+ *
+ * QR Code reader to use from browser.
+ */
+export class BrowserPDF417Reader extends BrowserCodeReader {
+    /**
+     * Creates an instance of BrowserPDF417Reader.
+     * @param {number} [timeBetweenScansMillis=500] the time delay between subsequent decode tries
+     */
+    constructor(timeBetweenScansMillis = 500) {
+        super(new PDF417Reader(), timeBetweenScansMillis);
+    }
+}