riverpod/examples/stackoverflow/lib/common.dart

import 'package:dio/dio.dart';
import 'package:flutter/material.dart';
import 'package:freezed_annotation/freezed_annotation.dart';
import 'package:hooks_riverpod/hooks_riverpod.dart';
import 'package:riverpod_annotation/riverpod_annotation.dart';

part 'common.g.dart';

final client = Provider((ref) => Dio());

/// A Provider that exposes the current theme.
///
/// This is unimplemented by default, and will be overridden inside [MaterialApp]
/// with the current theme obtained using a [BuildContext].
@Riverpod(
  // Specifying an empty "dependencies" signals riverpod_lint that this provider
  // is scoped. This enables catching places where we need to override
  // this provider.
  dependencies: [],
)
ThemeData theme(Ref ref) {
  throw UnimplementedError();
}

class TimestampParser implements JsonConverter<DateTime, int> {
  const TimestampParser();

  @override
  DateTime fromJson(int json) {
    return DateTime.fromMillisecondsSinceEpoch(
      json * 1000,
      isUtc: true,
    );
  }

  @override
  int toJson(DateTime object) => object.millisecondsSinceEpoch;
}