An extension for `AsyncSnapshot` with the `when` method from Riverpod's `AsyncValue` : Simplily use of `FutureBuilder`

when_extension.dart

import 'package:flutter/material.dart';

extension When<T> on AsyncSnapshot<T> {
  R when<R>({
    required R Function(T data) data,
    required R Function(Object error, StackTrace stackTrace) error,
    required R Function() loading,
  }) {
    switch (connectionState) {
      case ConnectionState.none:
        return loading();
      case ConnectionState.waiting:
        return loading();
      case ConnectionState.active:
        return loading();
      case ConnectionState.done:
        if (hasError) {
          return error(error, stackTrace!);
        } else {
          return data(this.data as T);
        }
    }
  }
}