Merge pull request #13329 from vector-im/t3chguy/app_load4

App load tweaks, improve error pages

__mocks__/cssMock.js

@@ -0,0 +1 @@
+module.exports = "css-file-stub";

package.json

@@ -215,6 +215,7 @@
       "<rootDir>/node_modules/matrix-react-sdk/test/setupTests.js"
     ],
     "moduleNameMapper": {
+      "\\.(css|scss)$": "<rootDir>/__mocks__/cssMock.js",
       "\\.(gif|png|svg|ttf|woff2)$": "<rootDir>/node_modules/matrix-react-sdk/__mocks__/imageMock.js",
       "\\$webapp/i18n/languages.json": "<rootDir>/node_modules/matrix-react-sdk/__mocks__/languages.json",
       "^browser-request$": "<rootDir>/node_modules/matrix-react-sdk/__mocks__/browser-request.js",

res/css/structures/ErrorView.scss

@@ -0,0 +1,101 @@
+/*
+Copyright 2020 New Vector Ltd
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+// import font-size variables manually, ideally this scss would get loaded by the theme which has all variables in context
+@import "../../../node_modules/matrix-react-sdk/res/css/_font-sizes.scss";
+
+.mx_ErrorView {
+    background: #c5e0f7;
+    background: -moz-linear-gradient(top, #c5e0f7 0%, #ffffff 100%);
+    background: -webkit-linear-gradient(top, #c5e0f7 0%, #ffffff 100%);
+    background: linear-gradient(to bottom, #c5e0f7 0%, #ffffff 100%);
+    filter: progid:DXImageTransform.Microsoft.gradient( startColorstr='#c5e0f7', endColorstr='#ffffff',GradientType=0 );
+    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif, "Apple Color Emoji", "Segoe UI Emoji", "Segoe UI Symbol";
+    width: 100%;
+    min-height: 100%;
+    height: auto;
+    color: #000;
+
+    .mx_ErrorView_container {
+        max-width: 680px;
+        margin: auto;
+    }
+
+    .mx_Button {
+        border: 0;
+        border-radius: 4px;
+        font-size: $font-18px;
+        margin-left: 4px;
+        margin-right: 4px;
+        min-width: 80px;
+        background-color: #03B381;
+        color: #fff;
+        cursor: pointer;
+        padding: 12px 22px;
+        word-break: break-word;
+        text-decoration: none;
+    }
+
+    .mx_Center {
+        justify-content: center;
+    }
+
+    .mx_HomePage_header {
+        color: #2E2F32;
+        display: flex;
+        align-items: center;
+        justify-content: center;
+    }
+
+    font-size: $font-16px;
+    h1 {
+        font-size: $font-32px;
+    }
+    h2 {
+        font-size: $font-24px;
+        color: #000;
+    }
+
+    .mx_HomePage_col {
+        display: flex;
+        flex-direction: row;
+    }
+
+    .mx_HomePage_row {
+        flex: 1 1 0;
+        display: flex;
+        flex-direction: row;
+        flex-wrap: wrap;
+    }
+
+    .mx_HomePage_logo {
+        margin: auto 20px auto 0;
+    }
+
+    h1, h2 {
+        font-weight: 600;
+        margin-bottom: 32px;
+    }
+
+    .mx_Spacer {
+        margin-top: 24px;
+    }
+
+    .mx_FooterLink {
+        color: #368BD6;
+        text-decoration: none;
+    }
+}

src/@types/global.d.ts

@@ -15,7 +15,7 @@ limitations under the License.
 */
 
 import "matrix-react-sdk/src/@types/global"; // load matrix-react-sdk's type extensions first
-import {Renderer} from "react-dom";
+import type {Renderer} from "react-dom";
 
 declare global {
     interface Window {