Skips BOM on Web Manifests

packages/core/src/lib/TwaGenerator.ts

@@ -273,7 +273,7 @@ export class TwaGenerator {
     }
 
     // We're writing as a string, but attempt to convert to check if it's a well-formed JSON.
-    const webManifestJson = await response.json();
+    const webManifestJson = JSON.parse((await response.text()).trim());
 
     // We want to ensure that "start_url" is the same used to launch the Trusted Web Activity.
     webManifestJson['start_url'] = twaManifest.startUrl;

packages/core/src/lib/TwaManifest.ts

@@ -359,7 +359,7 @@ export class TwaManifest {
    */
   static async fromWebManifest(url: string): Promise<TwaManifest> {
     const response = await fetchUtils.fetch(url);
-    const webManifest = await response.json();
+    const webManifest = JSON.parse((await response.text()).trim());
     const webManifestUrl: URL = new URL(url);
     return TwaManifest.fromWebManifestJson(webManifestUrl, webManifest);
   }