Originally posted by **r-pankevicius** February 13, 2023
Hi,
there are some things that go unnoticed when upgrading electron, but API changes are not reflected in backend API.
Here is one nasty example resulting in auto-update failures.
At some point downloadUpdate method from electron-updater changed the returned value to string array:
https://github.com/electron-userland/electron-builder/blob/master/packages/electron-updater/src/AppUpdater.ts#L460
But backend API was not changed:
https://github.com/theolivenbaum/electron-sharp/blob/main/ElectronSharp.API/AutoUpdater.cs#L433
The result is Json serialization exception (expected string, got array) and autoupdate fails to install. This is from `h5.ElectronNET`, but I checked this repo, it's the same.
```
2023-02-13 16:53:53.6620 ERROR [ElectronNET.API.BridgeConnector.LogError] Error running handler for event autoUpdaterDownloadUpdateComplete34955f7e-c08e-442e-af0b-89a6d09cc8c9 Newtonsoft.Json.JsonReaderException: Unexpected character encountered while parsing value: [. Path '', line 1, position 1.
at Newtonsoft.Json.JsonTextReader.ReadStringValue(ReadType readType)
at Newtonsoft.Json.JsonTextReader.ReadAsString()
at Newtonsoft.Json.JsonReader.ReadForType(JsonContract contract, Boolean hasConverter)
at Newtonsoft.Json.Serialization.JsonSerializerInternalReader.Deserialize(JsonReader reader, Type objectType, Boolean checkAdditionalContent)
at Newtonsoft.Json.JsonSerializer.DeserializeInternal(JsonReader reader, Type objectType)
at Newtonsoft.Json.JsonSerializer.Deserialize(JsonReader reader, Type objectType)
at Newtonsoft.Json.JsonConvert.DeserializeObject(String value, Type type, JsonSerializerSettings settings)
at Newtonsoft.Json.JsonConvert.DeserializeObject[T](String value, JsonSerializerSettings settings)
at SocketIOClient.Newtonsoft.Json.NewtonsoftJsonSerializer.Deserialize[T](String json, IList`1 bytes) in ...\h5.ElectronNET\ElectronNET.API\SocketIO\NewtonsoftJsonSerializer.cs:line 37
at SocketIOClient.SocketIOResponse.GetValue[T](Int32 index) in ...\h5.ElectronNET\ElectronNET.API\SocketIO\SocketIOResponse.cs:line 29
at ElectronNET.API.BridgeConnector.<>c__DisplayClass17_0`1.b__0(SocketIOResponse o) in ...\h5.ElectronNET\ElectronNET.API\BridgeConnector.cs:line 250
```
I wonder if it's possible to avoid such errors so TS or C# compiler error will point out electron API changes?
Discussed in https://github.com/theolivenbaum/electron-sharp/discussions/10