fix: pass null if no req.rawBody (#143)

Author: jthegedus

src/files/firebase-to-svelte-kit.js

@@ -13,7 +13,7 @@ export function toSvelteKitRequest(request) {
 		headers: toSvelteKitHeaders(request.headers),
 		rawBody: request.rawBody
 			? request.rawBody
-			: new Uint8Array(),
+			: null,
 		host,
 		path: pathname,
 		query: searchParameters,

tests/unit/src/files/firebase-to-svelte-kit.test.js

@@ -67,7 +67,7 @@ test('firebase-functions.https.request GET is converted to SvelteKit Incoming re
 			host: 'us-central1-func.cloudfunctions.net',
 			'x-forwarded-proto': 'https',
 		},
-		rawBody: new Uint8Array(),
+		rawBody: null,
 		host: 'https://us-central1-func.cloudfunctions.net',
 		path: '/url',
 		query: new URL('/url?some=thing', 'https://us-central1-func.cloudfunctions.net').searchParams,