Unclear how to get the free trial duration in iOS release builds

[Charles-Johnson]

I was able to determine the free trial duration period from the jsonRepresentation property when developing with an expo development client but I discovered that this property is null for iOS release builds. Is this for performance reasons? I didn't see that expo-iap does export an isEligibleForIntroOffer function but that still doesn't give me the free trial duration. Right now I'm considering forking the project and removing the debugSerialize call in expo-iap/ios/ExpoIapModule.swift

[Charles-Johnson]

I ended applying this patch which solved the iOS release build issue:

diff --git a/node_modules/expo-iap/ios/ExpoIapModule.swift b/node_modules/expo-iap/ios/ExpoIapModule.swift
index 51ff38f..af4abee 100644
--- a/node_modules/expo-iap/ios/ExpoIapModule.swift
+++ b/node_modules/expo-iap/ios/ExpoIapModule.swift
@@ -124,8 +124,8 @@ func serializeProduct(_ p: Product) -> [String: Any?] {
         "id": p.id,
         "title": p.displayName,
         "isFamilyShareable": p.isFamilyShareable,
-        "jsonRepresentation": serializeDebug(
-            String(data: p.jsonRepresentation, encoding: .utf8) ?? ""),
+        "jsonRepresentation": String(
+            data: p.jsonRepresentation, encoding: .utf8) ?? "",
         "price": p.price,
         "subscription": p.subscription,
         "type": p.type,

[hyochan]

This is a really good catch! Thank you for sharing and providing the detailed analysis.

I've implemented the fix in #69. Please feel free to submit PRs whenever you discover other issues in the future - your contributions are very much appreciated!

Thank you again for bringing this to our attention.