fix: add the iOS side of group members

android/src/main/java/expo/modules/xmtpreactnativesdk/XMTPModule.kt

@@ -806,12 +806,12 @@ class XMTPModule : Module() {
             }
         }
 
-        AsyncFunction("listGroupMember") Coroutine { clientAddress: String, groupId: String ->
+        AsyncFunction("listGroupMembers") Coroutine { clientAddress: String, groupId: String ->
             withContext(Dispatchers.IO) {
-                logV("listGroupMember")
+                logV("listGroupMembers")
                 val client = clients[clientAddress] ?: throw XMTPException("No client")
                 val group = findGroup(clientAddress, groupId)
-                group?.members().map { MemberWrapper.encode(it) }
+                group?.members()?.map { MemberWrapper.encode(it) }
             }
         }
 

ios/Wrappers/MemberWrapper.swift

@@ -0,0 +1,37 @@
+//
+//  MemberWrapper.swift
+//  XMTPReactNative
+//
+//  Created by Naomi Plasterer on 6/3/24.
+//
+
+import Foundation
+import XMTP
+
+// Wrapper around XMTP.Group to allow passing these objects back into react native.
+struct MemberWrapper {
+	static func encodeToObj(_ member: XMTP.Member) throws -> [String: Any] {
+		let permissionString = switch member.permissionLevel {
+			case .Member:
+				"member"
+			case .Admin:
+				"admin"
+			case .SuperAdmin:
+				"super_admin"
+		}
+		return [
+			"inboxId": member.inboxId,
+			"addresses": member.addresses,
+			"permissionLevel": permissionString,
+		]
+	}
+
+	static func encode(_ member: XMTP.Member) throws -> String {
+		let obj = try encodeToObj(member)
+		let data = try JSONSerialization.data(withJSONObject: obj)
+		guard let result = String(data: data, encoding: .utf8) else {
+			throw WrapperError.encodeError("could not encode member")
+		}
+		return result
+	}
+}

ios/XMTPModule.swift

@@ -697,6 +697,20 @@ public class XMTPModule: Module {
 			return try group.members.map(\.inboxId)
 		}
 
+		AsyncFunction("listGroupMembers") { (clientAddress: String, groupId: String) -> [String] in
+			guard let client = await clientsManager.getClient(key: clientAddress) else {
+				throw Error.noClient
+			}
+
+			guard let group = try await findGroup(clientAddress: clientAddress, id: groupId) else {
+				throw Error.conversationNotFound("no group found for \(groupId)")
+			}
+			return try group.members.compactMap { member in
+				return try MemberWrapper.encode(member)
+			}
+		}
+
+
 		AsyncFunction("syncGroups") { (clientAddress: String) in
 			guard let client = await clientsManager.getClient(key: clientAddress) else {
 				throw Error.noClient