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

node_modules/@zxing/browser/es2015/readers/BrowserDatamatrixCodeReader.d.ts

@@ -0,0 +1,12 @@
+import { DecodeHintType } from '@zxing/library';
+import { BrowserCodeReader } from './BrowserCodeReader';
+import { IBrowserCodeReaderOptions } from './IBrowserCodeReaderOptions';
+/**
+ * QR Code reader to use from browser.
+ */
+export declare class BrowserDatamatrixCodeReader extends BrowserCodeReader {
+    /**
+     * Creates an instance of BrowserQRCodeReader.
+     */
+    constructor(hints?: Map<DecodeHintType, any>, options?: IBrowserCodeReaderOptions);
+}