🐛 [cloud_firestore] Getting LegacyJavaScriptObject error with Timestamps

[AVancans]

[Platform: Web]

Unable to decode/infer Timestamp objects, throws Error: Expected a value of type 'Timestamp', but got one of type 'LegacyJavaScriptObject' even though when printed, the map shows Timestamp(seconds=1703827286, nanoseconds=951000000) but createdTimestamp.runtimeType prints LegacyJavaScriptObject

class Session {
 Timestamp createdTimestamp;

 static Session of(Map<String, dynamic> map) {
    return Session(map["createdTimestamp"]);
 }
}

---

Flutter dependencies

  firebase_core: ^2.25.1
  cloud_firestore: ^4.15.0
  firebase_auth: ^4.17.0

Rendering: canvaskit

[darshankawar]

@AVancans
Maybe you are hitting a related issue as #12237 that you can check.
Meanwhile, I was unable to replicate using the code snippet you provided. Can you provide runnable code sample ?

[AVancans]

@darshankawar
Thank you for quick reply. I noticed that it manages to decode the top-level Timestamp but fails to decode timestamp in the nested objects. So my class definition above is probably invalid, here is a more accurate one:

{
    invoice: {
        createdTimestamp: Timestamp(....),
    },
    createdTimestamp: Timestamp(....),
}

class Session {
    Invoice invoice;
    Timestamp createdTimestamp; //this is fine

    static Session of(Map<String, dynamic> map) {
        return Session(
            Invoice.of(map["invoice"])
        );
    }
}

class Invoice {
    Timestamp createdTimestamp; //this breaks

    static Invoiceof(Map<String, dynamic> map) {
        return Session(map["createdTimestamp"]);
    }
}

I'll try to create a runnable code sample 👋

[yarmel]

Have the same error in my function

static DateTime? toDate(dynamic date) {
    if (date == null) {
      return null;
    } else if (date is DateTime) {
      return date;
    } else if (date is String) {
      return DateTime.parse(date);
    } else if (date is int) {
      final int length = date.toString().length;

      return (length == 13)
          ? DateTime.fromMillisecondsSinceEpoch(date)
          : DateTime.fromMicrosecondsSinceEpoch(date);
    } else {
    // HERE when try to convert Timestamp to DateTime
    // Expected a value of type 'DateTime?', but got one of type 'LegacyJavaScriptObject'
      return date.toDate();
    }

[AVancans]

@darshankawar

Here is the code that can reproduce the error:

Object:

{
    nested: {
        timestamp: ....
    },
    timestamp: ...
}

Code:

  DocumentSnapshot doc = await FirebaseFirestore.instance.doc("_public/sample").get();
  Timestamp topLevel = doc.get("timestamp");
  print(topLevel);
  Timestamp nested = doc.get("nested.timestamp");
  print(nested);

Log:

Top level: Timestamp(seconds=1706803200, nanoseconds=45000000)
Error: Expected a value of type 'Timestamp', but got one of type 'LegacyJavaScriptObject'
dart-sdk/lib/_internal/js_dev_runtime/private/ddc_runtime/errors.dart 294:3       throw_
dart-sdk/lib/_internal/js_dev_runtime/private/ddc_runtime/errors.dart 127:3       castError
dart-sdk/lib/_internal/js_dev_runtime/private/ddc_runtime/operations.dart 818:12  cast
dart-sdk/lib/_internal/js_dev_runtime/private/ddc_runtime/classes.dart 652:14     as_C
packages/bemo_pos/main.dart 33:17                                                 tryTimestamp
dart-sdk/lib/_internal/js_dev_runtime/patch/async_patch.dart 45:50                <fn>
dart-sdk/lib/async/zone.dart 1661:54                                              runUnary
dart-sdk/lib/async/future_impl.dart 162:18                                        handleValue
dart-sdk/lib/async/future_impl.dart 846:44                                        handleValueCallback
dart-sdk/lib/async/future_impl.dart 875:13                                        _propagateToListeners
dart-sdk/lib/async/future_impl.dart 647:5                                         [_completeWithValue]
dart-sdk/lib/async/future_impl.dart 721:7                                         callback
dart-sdk/lib/async/schedule_microtask.dart 40:11                                  _microtaskLoop
dart-sdk/lib/async/schedule_microtask.dart 49:5                                   _startMicrotaskLoop
dart-sdk/lib/_internal/js_dev_runtime/patch/async_patch.dart 181:7                <fn>

[FedeRotoli]

I encountered the same error working with timestamp.

[yarmel]

Just updated all dependencies to the latest versions, but the problem with nested Map with DateTime is still present. Returns an error: "Expected a value of type 'DateTime?', but got one of type 'LegacyJavaScriptObject'. "

The problem is marked as resolved.
How to fix it?

  firebase_core: ^2.25.3
  firebase_auth: ^4.17.3
  firebase_storage: ^11.6.4
  firebase_remote_config: ^4.3.12
  firebase_messaging: ^14.7.14
  firebase_crashlytics: ^3.4.13
  firebase_analytics: ^10.8.4
  cloud_functions: ^4.6.4
  cloud_firestore: ^4.15.3

[AVancans]

@yarmel

It's working for me now.

  firebase_core: ^2.25.3
  cloud_firestore: ^4.15.3
  firebase_auth: ^4.17.0

Make sure you run pub get and restart any running debug services

[yarmel]

@yarmel

It's working for me now.

  firebase_core: ^2.25.3
  cloud_firestore: ^4.15.3
  firebase_auth: ^4.17.0

Make sure you run pub get and restart any running debug services

Unfortunately, not working

  firebase_core: ^2.25.3
  firebase_auth: ^4.17.3
  firebase_storage: ^11.6.4
  firebase_remote_config: ^4.3.12
  firebase_messaging: ^14.7.14
  firebase_crashlytics: ^3.4.13
  firebase_analytics: ^10.8.4
  cloud_functions: ^4.6.4
  cloud_firestore: ^4.15.3

Steps:

1. Flutter Clean
2. Flutter Pub Get
3. Flutter Pub Upgrade
4. Build web

Result:

Expected a value of type 'DateTime?', but got one of type 'LegacyJavaScriptObject'

Occurs when trying to convert to DateTime

  static DateTime? objToDate(dynamic date) {
 return date.toDate();
 }

Map structure in the firestore: