Error: The argument type 'InputDecorationThemeData?' can't be assigned to the parameter type 'InputDecorationTheme?'

[ehcpdeveloper]

$ flutter --version
Flutter 3.35.1 • channel stable • https://github.com/flutter/flutter.git
Framework • revision 20f8274939 (2 days ago) • 2025-08-14 10:53:09 -0700
Engine • hash 6cd51c08a88e7bbe848a762c20ad3ecb8b063c0e (revision 1e9a811bf8) (2 days ago) • 2025-08-13 23:35:25.000Z
Tools • Dart 3.9.0 • DevTools 2.48.0

Lots of such errors:

./../../../.pub-cache/hosted/pub.dev/json_theme-9.0.1+2/lib/src/codec/theme_decoder.dart:11688:28: Error: The argument type 'BottomAppBarTheme?' can't be assigned to the parameter type 'BottomAppBarThemeData?'.

• 'BottomAppBarTheme' is from 'package:flutter/src/material/bottom_app_bar_theme.dart' ('../../../../Downloads/flutter/packages/flutter/lib/src/material/bottom_app_bar_theme.dart').
• 'BottomAppBarThemeData' is from 'package:flutter/src/material/bottom_app_bar_theme.dart' ('../../../../Downloads/flutter/packages/flutter/lib/src/material/bottom_app_bar_theme.dart').
  bottomAppBarTheme: decodeBottomAppBarTheme(
  ^
  ../../../../.pub-cache/hosted/pub.dev/json_theme-9.0.1+2/lib/src/codec/theme_encoder.dart:1862:17: Error: The argument type 'InputDecorationThemeData?' can't be assigned to the parameter type 'InputDecorationTheme?'.
• 'InputDecorationThemeData' is from 'package:flutter/src/material/input_decorator.dart' ('../../../../Downloads/flutter/packages/flutter/lib/src/material/input_decorator.dart').
• 'InputDecorationTheme' is from 'package:flutter/src/material/input_decorator.dart' ('../../../../Downloads/flutter/packages/flutter/lib/src/material/input_decorator.dart').
  value.inputDecorationTheme,
  ^

This was working with last flutter version.

[qj-sam]

+1 on this

per Flutter 3.35 release notes

Component theme normalization: This release marks the completion of a significant, long-term project to normalize component themes. To make theming more consistent and align with Material 3, component themes like AppBarTheme, BottomAppBarTheme, and InputDecorationTheme have been refactored to be based on new, data-oriented …ThemeData classes.

[rjahn]

same problem

[rjahn]

workaround until fixed:

dependency_overrides:

  json_theme:
    git:
      url: https://github.com/wardbj93/json_theme
      path: packages/json_theme

[wardbj93]

PR process for this package was too cumbersome, feel free to fork mine and use as PR.

[oshtman]

PR process for this package was too cumbersome, feel free to fork mine and use as PR.

Did you guys manage to get the code-gen tool working using the fork? @wardbj93

[rjahn]

PR process for this package was too cumbersome, feel free to fork mine and use as PR.

Did you guys manage to get the code-gen tool working using the fork? @wardbj93

Didn't use it. Could try if you post an example.