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

node_modules/@zxing/text-encoding/es2015/encoding/terminology.d.ts

@@ -0,0 +1,16 @@
+/**
+ * An ASCII byte is a byte in the range 0x00 to 0x7F, inclusive.
+ * @param {number} a The number to test.
+ * @return {boolean} True if a is in the range 0x00 to 0x7F, inclusive.
+ */
+export declare function isASCIIByte(a: number): boolean;
+/**
+ * An ASCII code point is a code point in the range U+0000 to
+ * U+007F, inclusive.
+ */
+export declare const isASCIICodePoint: typeof isASCIIByte;
+/**
+ * End-of-stream is a special token that signifies no more tokens
+ * are in the stream.
+ * @const
+ */ export declare const end_of_stream = -1;