Migrate to web package

This introduces full WASM support for PowaSys Frontend - now only intl needs to properly support it

lib/bloc/cubits/export_cubit.dart

@@ -1,5 +1,4 @@
 import 'dart:convert';
-import 'dart:html';
 
 import 'package:flutter_bloc/flutter_bloc.dart';
 import 'package:powasys_frontend/bloc/repos/data_repo.dart';
@@ -8,6 +7,7 @@ import 'package:powasys_frontend/constants.dart';
 import 'package:powasys_frontend/data/trend.dart';
 import 'package:powasys_frontend/generated/l10n.dart';
 import 'package:tuple/tuple.dart';
+import 'package:web/web.dart';
 
 class ExportCubit extends Cubit<ExportState> {
   ExportCubit(this._dataRepo)
@@ -66,13 +66,13 @@ class ExportCubit extends Cubit<ExportState> {
                     "${e.item3[Trend.temperature]}\n",
               ).join()}';
 
+      final elem = document.createElement('anchor') as HTMLAnchorElement
+        ..href = 'data:application/octet-stream;charset=utf-16le;base64,'
+            '${base64Encode(toExport.codeUnits)}';
       emit(
         state.copyWith(
           state: ExportGenState.exported,
-          toDownload: AnchorElement(
-            href: 'data:application/octet-stream;charset=utf-16le;base64,'
-                '${base64Encode(toExport.codeUnits)}',
-          ),
+          toDownload: elem,
         ),
       );
     } catch (e) {

lib/bloc/states.dart

@@ -1,9 +1,8 @@
-import 'dart:html';
-
 import 'package:fl_chart/fl_chart.dart';
 import 'package:flutter/material.dart';
 import 'package:powasys_frontend/data/trend.dart';
 import 'package:tuple/tuple.dart';
+import 'package:web/web.dart';
 
 class BlocState<State> {
   const BlocState(
@@ -82,12 +81,12 @@ class ExportState extends BlocState<ExportGenState> {
     this.toDownload,
   });
 
-  final AnchorElement? toDownload;
+  final HTMLAnchorElement? toDownload;
 
   ExportState copyWith({
     ExportGenState? state,
     ex,
-    AnchorElement? toDownload,
+    HTMLAnchorElement? toDownload,
   }) =>
       ExportState(
         state ?? super.state,

pubspec.lock

@@ -350,7 +350,7 @@ packages:
     source: hosted
     version: "2.1.4"
   web:
-    dependency: transitive
+    dependency: "direct main"
     description:
       name: web
       sha256: d43c1d6b787bf0afad444700ae7f4db8827f701bc61c255ac8d328c6f4d52062

pubspec.yaml

@@ -40,6 +40,7 @@ dependencies:
   package_info_plus: ^8.0.0
   sprintf: ^7.0.0
   tuple: ^2.0.0
+  web: ^1.0.0
 
 dev_dependencies:
   flutter_lints: ^4.0.0