Incorrect data in callback react-native-blob-util@0.22.1

[szujak]

Hello,

After upgrading to 0.22.1 I noticed that there is an issue with returning data from ReactNativeBlobUtil.df on windows.

I'm calling this method const availableDiskSpace = await ReactNativeBlobUtil.fs.df(); but instead of information about storage the error is thrown with message {"code":"EUNSPECIFIED"}

After checking the df method code I noticed that on windows the storage info is populated in err argument

function df(): Promise<{ free: number, total: number }> {
    return new Promise((resolve, reject) => {
        ReactNativeBlobUtil.df((err, stat) => {
            console.log(err, stat) // the err argument contains [{"free": 123, "total": 1234}] and stat is undefined
            if (err)
                reject(addCode('EUNSPECIFIED', new Error(err)));
            else
                resolve(stat);
        });
    });
}

Calling the same method on android works fine - err is null and stat contains storage info

[szujak]

Also the data format looks different on Android and Windows

Android (object):
{"external_free": "51120422912", "external_total": "52655943680", "internal_free": "51120422912", "internal_total": "52655943680"}

Windows (array with object):
[{"free": 337609101312, "total": 1023285473280}]

[szujak]

For now I adjusted winrt::fire_and_forget ReactNativeBlobUtil::df function to

winrt::fire_and_forget ReactNativeBlobUtil::df(
    std::function<void(::React::JSValue, ::React::JSValue)> callback) noexcept
{ 
        try
        {
            auto localFolder = winrt::Windows::Storage::ApplicationData::Current().LocalFolder();
            auto properties{ co_await localFolder.Properties().RetrievePropertiesAsync({L"System.FreeSpace", L"System.Capacity"}) };

            winrt::Microsoft::ReactNative::JSValueObject result;
            result["free"] = winrt::unbox_value<uint64_t>(properties.Lookup(L"System.FreeSpace"));
            result["total"] = winrt::unbox_value<uint64_t>(properties.Lookup(L"System.Capacity"));

            callback(nullptr, ::React::JSValueObject(std::move(result)));
        }
        catch (...)
        {
            winrt::Microsoft::ReactNative::JSValueObject error;
            error["error"] = "Failed to get storage usage.";

            callback(::React::JSValueObject(std::move(error)), nullptr);
        }
}

[anupriya13]

Yes, this was generated as per the codegen Spec file which had std::function<void(::React::JSValueArray)> callback. @RonRadtke can confirm which one we should follow?
JS to C++ via turbomodules

react-native-blob-util/codegenSpecs/NativeBlobUtils.js

Line 64 in 1533f64

+df: (callback: (value: Array<any>) => void) => void;

[RonRadtke]

I would say the codegen ist wrong here. It should be a plain object, no need for wrapping it in an array.
But should check that iOS is doing the same then. Sadly enough we can't use the exact same keys for Android / win / iOS