diff --git a/.github/workflows/continuous_integration.yml b/.github/workflows/continuous_integration.yml
index 06c1c58e..2036e4e6 100644
--- a/.github/workflows/continuous_integration.yml
+++ b/.github/workflows/continuous_integration.yml
@@ -52,6 +52,10 @@ jobs:
           PUSHER_URL: "//localhost:8080"
         working-directory: "front"
 
+      - name: "Svelte check"
+        run: yarn run svelte-check
+        working-directory: "front"
+
       - name: "Lint"
         run: yarn run lint
         working-directory: "front"
diff --git a/front/package.json b/front/package.json
index 1c938195..f6b99bcb 100644
--- a/front/package.json
+++ b/front/package.json
@@ -20,9 +20,11 @@
     "jasmine": "^3.5.0",
     "mini-css-extract-plugin": "^1.6.0",
     "node-polyfill-webpack-plugin": "^1.1.2",
+    "npm-run-all": "^4.1.5",
     "sass": "^1.32.12",
     "sass-loader": "^11.1.0",
     "svelte": "^3.38.2",
+    "svelte-check": "^2.1.0",
     "svelte-loader": "^3.1.1",
     "svelte-preprocess": "^4.7.3",
     "ts-loader": "^9.1.2",
@@ -50,10 +52,13 @@
     "standardized-audio-context": "^25.2.4"
   },
   "scripts": {
-    "start": "TS_NODE_PROJECT=\"tsconfig-for-webpack.json\" webpack serve --open",
+    "start": "run-p serve svelte-check-watch",
+    "serve": "TS_NODE_PROJECT=\"tsconfig-for-webpack.json\" webpack serve --open",
     "build": "TS_NODE_PROJECT=\"tsconfig-for-webpack.json\" NODE_ENV=production webpack",
     "test": "TS_NODE_PROJECT=\"tsconfig-for-jasmine.json\" ts-node node_modules/jasmine/bin/jasmine --config=jasmine.json",
     "lint": "node_modules/.bin/eslint src/ . --ext .ts",
-    "fix": "node_modules/.bin/eslint --fix src/ . --ext .ts"
+    "fix": "node_modules/.bin/eslint --fix src/ . --ext .ts",
+    "svelte-check-watch": "svelte-check --fail-on-warnings --fail-on-hints --compiler-warnings \"a11y-no-onchange:ignore,a11y-autofocus:ignore\" --watch",
+    "svelte-check":       "svelte-check --fail-on-warnings --fail-on-hints --compiler-warnings \"a11y-no-onchange:ignore,a11y-autofocus:ignore\""
   }
 }
diff --git a/front/src/Components/App.svelte b/front/src/Components/App.svelte
index a39f2dc7..c973a6c2 100644
--- a/front/src/Components/App.svelte
+++ b/front/src/Components/App.svelte
@@ -1,6 +1,4 @@
 <script lang="typescript">
-    import MenuIcon from "./Menu/MenuIcon.svelte";
-    import {menuIconVisible} from "../Stores/MenuStore";
     import {enableCameraSceneVisibilityStore, gameOverlayVisibilityStore} from "../Stores/MediaStore";
     import CameraControls from "./CameraControls.svelte";
     import MyCamera from "./MyCamera.svelte";
@@ -17,7 +15,7 @@
     import VisitCard from "./VisitCard/VisitCard.svelte";
     import {requestVisitCardsStore} from "../Stores/GameStore";
 
-    import {Game} from "../Phaser/Game/Game";
+    import type {Game} from "../Phaser/Game/Game";
     import {helpCameraSettingsVisibleStore} from "../Stores/HelpCameraSettingsStore";
     import HelpCameraSettingsPopup from "./HelpCameraSettings/HelpCameraSettingsPopup.svelte";
     import AudioPlaying from "./UI/AudioPlaying.svelte";
@@ -74,7 +72,7 @@
     {/if}
     {#if $helpCameraSettingsVisibleStore}
         <div>
-            <HelpCameraSettingsPopup game={ game }></HelpCameraSettingsPopup>
+            <HelpCameraSettingsPopup></HelpCameraSettingsPopup>
         </div>
     {/if}
     {#if $requestVisitCardsStore}
diff --git a/front/src/Components/CustomCharacterScene/CustomCharacterScene.svelte b/front/src/Components/CustomCharacterScene/CustomCharacterScene.svelte
index f9e3a66b..1807f15d 100644
--- a/front/src/Components/CustomCharacterScene/CustomCharacterScene.svelte
+++ b/front/src/Components/CustomCharacterScene/CustomCharacterScene.svelte
@@ -1,10 +1,10 @@
 <script lang="typescript">
-    import { Game } from "../../Phaser/Game/Game";
-    import { CustomizeSceneName } from "../../Phaser/Login/CustomizeScene";
+    import type { Game } from "../../Phaser/Game/Game";
+    import {CustomizeScene, CustomizeSceneName} from "../../Phaser/Login/CustomizeScene";
 
     export let game: Game;
 
-    const customCharacterScene = game.scene.getScene(CustomizeSceneName);
+    const customCharacterScene = game.scene.getScene(CustomizeSceneName) as CustomizeScene;
     let activeRow = customCharacterScene.activeRow;
 
     function selectLeft() {
@@ -116,4 +116,4 @@
   }
 
 
-</style>
\ No newline at end of file
+</style>
diff --git a/front/src/Components/EnableCamera/EnableCameraScene.svelte b/front/src/Components/EnableCamera/EnableCameraScene.svelte
index 605a1458..1f9ef027 100644
--- a/front/src/Components/EnableCamera/EnableCameraScene.svelte
+++ b/front/src/Components/EnableCamera/EnableCameraScene.svelte
@@ -1,5 +1,5 @@
 <script lang="typescript">
-    import {Game} from "../../Phaser/Game/Game";
+    import type {Game} from "../../Phaser/Game/Game";
     import {EnableCameraScene, EnableCameraSceneName} from "../../Phaser/Login/EnableCameraScene";
     import {
         audioConstraintStore,
@@ -15,8 +15,8 @@
     import microphoneImg from "../images/microphone.svg";
 
     export let game: Game;
-    let selectedCamera : string|null = null;
-    let selectedMicrophone : string|null = null;
+    let selectedCamera : string|undefined = undefined;
+    let selectedMicrophone : string|undefined = undefined;
 
     const enableCameraScene = game.scene.getScene(EnableCameraSceneName) as EnableCameraScene;
 
@@ -24,10 +24,10 @@
         enableCameraScene.login();
     }
 
-    function srcObject(node, stream) {
+    function srcObject(node: HTMLVideoElement, stream: MediaStream) {
         node.srcObject = stream;
         return {
-            update(newStream) {
+            update(newStream: MediaStream) {
                 if (node.srcObject != newStream) {
                     node.srcObject = newStream
                 }
@@ -53,8 +53,8 @@
             }
         } else {
             stream = null;
-            selectedCamera = null;
-            selectedMicrophone = null;
+            selectedCamera = undefined;
+            selectedMicrophone = undefined;
         }
     });
 
@@ -79,7 +79,7 @@
     <section class="text-center">
         <h2>Turn on your camera and microphone</h2>
     </section>
-        {#if $localStreamStore.stream}
+        {#if $localStreamStore.type === 'success' && $localStreamStore.stream}
             <video class="myCamVideoSetup" use:srcObject={$localStreamStore.stream} autoplay muted playsinline></video>
         {:else }
             <div class="webrtcsetup">
diff --git a/front/src/Components/EnableCamera/HorizontalSoundMeterWidget.svelte b/front/src/Components/EnableCamera/HorizontalSoundMeterWidget.svelte
index 84352ebb..a22da2fa 100644
--- a/front/src/Components/EnableCamera/HorizontalSoundMeterWidget.svelte
+++ b/front/src/Components/EnableCamera/HorizontalSoundMeterWidget.svelte
@@ -8,7 +8,7 @@
 
     const NB_BARS = 20;
 
-    let timeout;
+    let timeout: ReturnType<typeof setTimeout>;
     const soundMeter = new SoundMeter();
     let display = false;
 
diff --git a/front/src/Components/Login/LoginScene.svelte b/front/src/Components/Login/LoginScene.svelte
index dbe3daaf..fe3c2c63 100644
--- a/front/src/Components/Login/LoginScene.svelte
+++ b/front/src/Components/Login/LoginScene.svelte
@@ -1,14 +1,13 @@
 <script lang="typescript">
-    import {Game} from "../../Phaser/Game/Game";
-    import {LoginSceneName} from "../../Phaser/Login/LoginScene";
+    import type {Game} from "../../Phaser/Game/Game";
+    import {LoginScene, LoginSceneName} from "../../Phaser/Login/LoginScene";
     import {DISPLAY_TERMS_OF_USE, MAX_USERNAME_LENGTH} from "../../Enum/EnvironmentVariable";
     import logoImg from "../images/logo.png";
     import {gameManager} from "../../Phaser/Game/GameManager";
-    import {maxUserNameLength} from "../../Connexion/LocalUser";
 
     export let game: Game;
 
-    const loginScene = game.scene.getScene(LoginSceneName);
+    const loginScene = game.scene.getScene(LoginSceneName) as LoginScene;
 
     let name = gameManager.getPlayerName() || '';
     let startValidating = false;
diff --git a/front/src/Components/MyCamera.svelte b/front/src/Components/MyCamera.svelte
index 3ff88d89..ed4154a9 100644
--- a/front/src/Components/MyCamera.svelte
+++ b/front/src/Components/MyCamera.svelte
@@ -3,10 +3,10 @@
     import SoundMeterWidget from "./SoundMeterWidget.svelte";
     import {onDestroy} from "svelte";
 
-    function srcObject(node, stream) {
+    function srcObject(node: HTMLVideoElement, stream: MediaStream) {
         node.srcObject = stream;
         return {
-            update(newStream) {
+            update(newStream: MediaStream) {
                 if (node.srcObject != newStream) {
                     node.srcObject = newStream
                 }
@@ -38,9 +38,9 @@
 
 <div>
     <div class="video-container div-myCamVideo" class:hide={!$localStreamStore.constraints.video}>
+        {#if $localStreamStore.type === "success" && $localStreamStore.stream }
         <video class="myCamVideo" use:srcObject={$localStreamStore.stream} autoplay muted playsinline></video>
-        <!-- {#if stream}
         <SoundMeterWidget stream={stream}></SoundMeterWidget>
-        {/if} -->
+        {/if}
     </div>
 </div>
diff --git a/front/src/Components/SelectCompanion/SelectCompanionScene.svelte b/front/src/Components/SelectCompanion/SelectCompanionScene.svelte
index 205a18ee..04efe124 100644
--- a/front/src/Components/SelectCompanion/SelectCompanionScene.svelte
+++ b/front/src/Components/SelectCompanion/SelectCompanionScene.svelte
@@ -1,10 +1,10 @@
 <script lang="typescript">
-    import {Game} from "../../Phaser/Game/Game";
-    import {SelectCompanionSceneName} from "../../Phaser/Login/SelectCompanionScene";
+    import type {Game} from "../../Phaser/Game/Game";
+    import {SelectCompanionScene, SelectCompanionSceneName} from "../../Phaser/Login/SelectCompanionScene";
 
     export let game: Game;
 
-    const selectCompanionScene = game.scene.getScene(SelectCompanionSceneName);
+    const selectCompanionScene = game.scene.getScene(SelectCompanionSceneName) as SelectCompanionScene;
 
     function selectLeft() {
         selectCompanionScene.moveToLeft();
diff --git a/front/src/Components/SoundMeterWidget.svelte b/front/src/Components/SoundMeterWidget.svelte
index 40c467b1..30650e3f 100644
--- a/front/src/Components/SoundMeterWidget.svelte
+++ b/front/src/Components/SoundMeterWidget.svelte
@@ -8,7 +8,7 @@
 
     const NB_BARS = 5;
 
-    let timeout;
+    let timeout: ReturnType<typeof setTimeout>;
     const soundMeter = new SoundMeter();
     let display = false;
 
diff --git a/front/src/Components/UI/AudioPlaying.svelte b/front/src/Components/UI/AudioPlaying.svelte
index 8889ac52..97f77429 100644
--- a/front/src/Components/UI/AudioPlaying.svelte
+++ b/front/src/Components/UI/AudioPlaying.svelte
@@ -2,7 +2,7 @@
     import { fly } from 'svelte/transition';
     import megaphoneImg from "./images/megaphone.svg";
     import {soundPlayingStore} from "../../Stores/SoundPlayingStore";
-    import {afterUpdate, onMount} from "svelte";
+    import {afterUpdate} from "svelte";
 
     export let url: string;
     let audio: HTMLAudioElement;
diff --git a/front/src/Components/VisitCard/VisitCard.svelte b/front/src/Components/VisitCard/VisitCard.svelte
index ebf22934..78f10359 100644
--- a/front/src/Components/VisitCard/VisitCard.svelte
+++ b/front/src/Components/VisitCard/VisitCard.svelte
@@ -7,7 +7,7 @@
     let w = '500px';
     let h = '250px';
     let hidden = true;
-    let cvIframe;
+    let cvIframe: HTMLIFrameElement;
 
     function closeCard() {
         requestVisitCardsStore.set(null);
diff --git a/front/src/Components/selectCharacter/SelectCharacterScene.svelte b/front/src/Components/selectCharacter/SelectCharacterScene.svelte
index e227771c..5a37efda 100644
--- a/front/src/Components/selectCharacter/SelectCharacterScene.svelte
+++ b/front/src/Components/selectCharacter/SelectCharacterScene.svelte
@@ -1,10 +1,10 @@
 <script lang="typescript">
-    import { Game } from "../../Phaser/Game/Game";
-    import { SelectCharacterSceneName } from "../../Phaser/Login/SelectCharacterScene";
+    import type { Game } from "../../Phaser/Game/Game";
+    import {SelectCharacterScene, SelectCharacterSceneName} from "../../Phaser/Login/SelectCharacterScene";
 
     export let game: Game;
 
-    const selectCharacterScene = game.scene.getScene(SelectCharacterSceneName);
+    const selectCharacterScene = game.scene.getScene(SelectCharacterSceneName) as SelectCharacterScene;
 
     function selectLeft() {
         selectCharacterScene.moveToLeft();
@@ -89,4 +89,4 @@
   }
 
 
-</style>
\ No newline at end of file
+</style>
diff --git a/front/src/Phaser/Login/CustomizeScene.ts b/front/src/Phaser/Login/CustomizeScene.ts
index 9d0e7877..715cb67d 100644
--- a/front/src/Phaser/Login/CustomizeScene.ts
+++ b/front/src/Phaser/Login/CustomizeScene.ts
@@ -263,7 +263,7 @@ export class CustomizeScene extends AbstractCharacterScene {
         this.Rectangle.y = this.cameras.main.worldView.y + this.cameras.main.height / 3;
      }
 
-    private nextSceneToCamera(){
+    public nextSceneToCamera(){
         const layers: string[] = [];
             let i = 0;
             for (const layerItem of this.selectedLayers) {
@@ -284,7 +284,7 @@ export class CustomizeScene extends AbstractCharacterScene {
             customCharacterSceneVisibleStore.set(false);
     }
 
-    private backToPreviousScene(){
+    public backToPreviousScene(){
         this.scene.sleep(CustomizeSceneName);
         waScaleManager.restoreZoom();
         this.scene.run(SelectCharacterSceneName);
diff --git a/front/src/Phaser/Login/SelectCharacterScene.ts b/front/src/Phaser/Login/SelectCharacterScene.ts
index 1abd58e5..0f590840 100644
--- a/front/src/Phaser/Login/SelectCharacterScene.ts
+++ b/front/src/Phaser/Login/SelectCharacterScene.ts
@@ -92,7 +92,7 @@ export class SelectCharacterScene extends AbstractCharacterScene {
         });
     }
 
-    protected nextSceneToCameraScene(): void {
+    public nextSceneToCameraScene(): void {
         if (this.selectedPlayer !== null && !areCharacterLayersValid([this.selectedPlayer.texture.key])) {
             return;
         }
@@ -108,7 +108,7 @@ export class SelectCharacterScene extends AbstractCharacterScene {
         this.events.removeListener('wake');
     }
 
-    protected nextSceneToCustomizeScene(): void {
+    public nextSceneToCustomizeScene(): void {
         if (this.selectedPlayer !== null && !areCharacterLayersValid([this.selectedPlayer.texture.key])) {
             return;
         }
@@ -118,7 +118,7 @@ export class SelectCharacterScene extends AbstractCharacterScene {
         selectCharacterSceneVisibleStore.set(false);
     }
 
-    createCurrentPlayer(): void {        
+    createCurrentPlayer(): void {
         for (let i = 0; i <this.playerModels.length; i++) {
             const playerResource = this.playerModels[i];
 
@@ -165,7 +165,7 @@ export class SelectCharacterScene extends AbstractCharacterScene {
         this.updateSelectedPlayer();
     }
 
-    protected moveToLeft(){
+    public moveToLeft(){
         if(this.currentSelectUser === 0){
             return;
         }
@@ -173,7 +173,7 @@ export class SelectCharacterScene extends AbstractCharacterScene {
         this.moveUser();
     }
 
-    protected moveToRight(){
+    public moveToRight(){
         if(this.currentSelectUser === (this.players.length - 1)){
             return;
         }
diff --git a/front/src/ambient.d.ts b/front/src/ambient.d.ts
new file mode 100644
index 00000000..eee8d6c1
--- /dev/null
+++ b/front/src/ambient.d.ts
@@ -0,0 +1,38 @@
+/**
+ * These declarations tell TypeScript that we allow import of images, e.g.
+ * ```
+ <script lang='ts'>
+ import successkid from 'images/successkid.jpg';
+ </script>
+ <img src="{successkid}">
+ ```
+ */
+declare module "*.gif" {
+    const value: string;
+    export = value;
+}
+
+declare module "*.jpg" {
+    const value: string;
+    export = value;
+}
+
+declare module "*.jpeg" {
+    const value: string;
+    export = value;
+}
+
+declare module "*.png" {
+    const value: string;
+    export = value;
+}
+
+declare module "*.svg" {
+    const value: string;
+    export = value;
+}
+
+declare module "*.webp" {
+    const value: string;
+    export = value;
+}
diff --git a/front/yarn.lock b/front/yarn.lock
index dc43f559..e64a76c1 100644
--- a/front/yarn.lock
+++ b/front/yarn.lock
@@ -651,7 +651,7 @@ anymatch@^2.0.0:
     micromatch "^3.1.4"
     normalize-path "^2.1.1"
 
-anymatch@~3.1.1:
+anymatch@~3.1.1, anymatch@~3.1.2:
   version "3.1.2"
   resolved "https://registry.yarnpkg.com/anymatch/-/anymatch-3.1.2.tgz#c0557c096af32f106198f4f4e2a383537e378716"
   integrity sha512-P43ePfOAIupkguHUycrc4qJ9kz8ZiuOUijaETwX7THt0Y/GNK7v0aa8rY816xWjZ7rJdA5XdMcpVFTKMq+RvWg==
@@ -1112,7 +1112,7 @@ caniuse-lite@^1.0.30001219:
   resolved "https://registry.yarnpkg.com/caniuse-lite/-/caniuse-lite-1.0.30001228.tgz#bfdc5942cd3326fa51ee0b42fbef4da9d492a7fa"
   integrity sha512-QQmLOGJ3DEgokHbMSA8cj2a+geXqmnpyOFT0lhQV6P3/YOJvGDEwoedcwxEQ30gJIwIIunHIicunJ2rzK5gB2A==
 
-chalk@^2.0.0:
+chalk@^2.0.0, chalk@^2.4.1:
   version "2.4.2"
   resolved "https://registry.yarnpkg.com/chalk/-/chalk-2.4.2.tgz#cd42541677a54333cf541a49108c1432b44c9424"
   integrity sha512-Mti+f9lpJNcwF4tWV8/OrTTtF1gZi+f8FqlyAdouralcFWFQWF2+NgCHShjkCb+IFBLq9buZwE1xckQU4peSuQ==
@@ -1163,6 +1163,21 @@ chokidar@^2.1.8:
   optionalDependencies:
     fsevents "^1.2.7"
 
+chokidar@^3.4.1:
+  version "3.5.2"
+  resolved "https://registry.yarnpkg.com/chokidar/-/chokidar-3.5.2.tgz#dba3976fcadb016f66fd365021d91600d01c1e75"
+  integrity sha512-ekGhOnNVPgT77r4K/U3GDhu+FQ2S8TnK/s2KbIGXi0SZWuwkZ2QNyfWdZW+TVfn84DpEP7rLeCt2UI6bJ8GwbQ==
+  dependencies:
+    anymatch "~3.1.2"
+    braces "~3.0.2"
+    glob-parent "~5.1.2"
+    is-binary-path "~2.1.0"
+    is-glob "~4.0.1"
+    normalize-path "~3.0.0"
+    readdirp "~3.6.0"
+  optionalDependencies:
+    fsevents "~2.3.2"
+
 chrome-trace-event@^1.0.2:
   version "1.0.3"
   resolved "https://registry.yarnpkg.com/chrome-trace-event/-/chrome-trace-event-1.0.3.tgz#1015eced4741e15d06664a957dbbf50d041e26ac"
@@ -1402,7 +1417,7 @@ create-require@^1.1.0:
   resolved "https://registry.yarnpkg.com/create-require/-/create-require-1.1.1.tgz#c1d7e8f1e5f6cfc9ff65f9cd352d37348756c333"
   integrity sha512-dcKFX3jn0MpIaXjisoRvexIJVEKzaq7z2rZKxf+MSr9TkdmHmsU4m2lcLojrj/FHl8mk5VxMmYA+ftRkP/3oKQ==
 
-cross-spawn@^6.0.0:
+cross-spawn@^6.0.0, cross-spawn@^6.0.5:
   version "6.0.5"
   resolved "https://registry.yarnpkg.com/cross-spawn/-/cross-spawn-6.0.5.tgz#4a5ec7c64dfae22c3a14124dbacdee846d80cbc4"
   integrity sha512-eTVLrBSt7fjbDygz805pMnstIs2VTBNkRm0qxZd+M7A5XDdxVRWO5MxGBXZhjY4cqLYLdtrGqRf8mBPmzwSpWQ==
@@ -2365,7 +2380,7 @@ fsevents@^1.2.7:
     bindings "^1.5.0"
     nan "^2.12.1"
 
-fsevents@~2.3.1:
+fsevents@~2.3.1, fsevents@~2.3.2:
   version "2.3.2"
   resolved "https://registry.yarnpkg.com/fsevents/-/fsevents-2.3.2.tgz#8a526f78b8fdf4623b709e0b975c52c24c02fd1a"
   integrity sha512-xiqMQR4xAeHTuB9uWm+fFRcIOgKBMiOBP+eXiyT7jsgVCq1bkVygt00oASowB7EdtpOHaaPgKt812P9ab+DDKA==
@@ -2429,7 +2444,7 @@ glob-parent@^3.1.0:
     is-glob "^3.1.0"
     path-dirname "^1.0.0"
 
-glob-parent@^5.0.0, glob-parent@^5.1.0, glob-parent@~5.1.0:
+glob-parent@^5.0.0, glob-parent@^5.1.0, glob-parent@~5.1.0, glob-parent@~5.1.2:
   version "5.1.2"
   resolved "https://registry.yarnpkg.com/glob-parent/-/glob-parent-5.1.2.tgz#869832c58034fe68a4093c17dc15e8340d8401c4"
   integrity sha512-AOIgSQCepiJYwP3ARnGx+5VnTu2HBYdzbGP45eLw1vr3zB3vZLeyed1sC9hnbcOc9/SrMyM5RPQrkGz4aS9Zow==
@@ -2606,6 +2621,11 @@ hmac-drbg@^1.0.1:
     minimalistic-assert "^1.0.0"
     minimalistic-crypto-utils "^1.0.1"
 
+hosted-git-info@^2.1.4:
+  version "2.8.9"
+  resolved "https://registry.yarnpkg.com/hosted-git-info/-/hosted-git-info-2.8.9.tgz#dffc0bf9a21c02209090f2aa69429e1414daf3f9"
+  integrity sha512-mxIDAb9Lsm6DoOJ7xH+5+X4y1LU/4Hi50L9C5sIswK3JzULS4bwk1FvjdBgvYR4bzT4tuUQiC15FE2f5HbLvYw==
+
 hpack.js@^2.1.6:
   version "2.1.6"
   resolved "https://registry.yarnpkg.com/hpack.js/-/hpack.js-2.1.6.tgz#87774c0949e513f42e84575b3c45681fade2a0b2"
@@ -3177,7 +3197,7 @@ js-yaml@^3.13.1:
     argparse "^1.0.7"
     esprima "^4.0.0"
 
-json-parse-better-errors@^1.0.2:
+json-parse-better-errors@^1.0.1, json-parse-better-errors@^1.0.2:
   version "1.0.2"
   resolved "https://registry.yarnpkg.com/json-parse-better-errors/-/json-parse-better-errors-1.0.2.tgz#bb867cfb3450e69107c131d1c514bab3dc8bcaa9"
   integrity sha512-mrqyZKfX5EhL7hvqcV6WG1yYjnjeuYDzDhhcAAUrq8Po85NBQBJP+ZDUT75qZQ98IkUoBqdkExkukOU7Ts2wrw==
@@ -3282,6 +3302,16 @@ linked-list-typescript@^1.0.11:
   resolved "https://registry.yarnpkg.com/linked-list-typescript/-/linked-list-typescript-1.0.15.tgz#faeed93cf9203f102e2158c29edcddda320abe82"
   integrity sha512-RIyUu9lnJIyIaMe63O7/aFv/T2v3KsMFuXMBbUQCHX+cgtGro86ETDj5ed0a8gQL2+DFjzYYsgVG4I36/cUwgw==
 
+load-json-file@^4.0.0:
+  version "4.0.0"
+  resolved "https://registry.yarnpkg.com/load-json-file/-/load-json-file-4.0.0.tgz#2f5f45ab91e33216234fd53adab668eb4ec0993b"
+  integrity sha1-L19Fq5HjMhYjT9U62rZo607AmTs=
+  dependencies:
+    graceful-fs "^4.1.2"
+    parse-json "^4.0.0"
+    pify "^3.0.0"
+    strip-bom "^3.0.0"
+
 loader-runner@^4.2.0:
   version "4.2.0"
   resolved "https://registry.yarnpkg.com/loader-runner/-/loader-runner-4.2.0.tgz#d7022380d66d14c5fb1d496b89864ebcfd478384"
@@ -3396,6 +3426,11 @@ memory-fs@^0.4.1:
     errno "^0.1.3"
     readable-stream "^2.0.1"
 
+memorystream@^0.3.1:
+  version "0.3.1"
+  resolved "https://registry.yarnpkg.com/memorystream/-/memorystream-0.3.1.tgz#86d7090b30ce455d63fbae12dda51a47ddcaf9b2"
+  integrity sha1-htcJCzDORV1j+64S3aUaR93K+bI=
+
 merge-descriptors@1.0.1:
   version "1.0.1"
   resolved "https://registry.yarnpkg.com/merge-descriptors/-/merge-descriptors-1.0.1.tgz#b00aaa556dd8b44568150ec9d1b953f3f90cbb61"
@@ -3529,6 +3564,11 @@ mkdirp@^0.5.1, mkdirp@^0.5.5:
   dependencies:
     minimist "^1.2.5"
 
+mri@^1.1.0:
+  version "1.1.6"
+  resolved "https://registry.yarnpkg.com/mri/-/mri-1.1.6.tgz#49952e1044db21dbf90f6cd92bc9c9a777d415a6"
+  integrity sha512-oi1b3MfbyGa7FJMP9GmLTttni5JoICpYBRlq+x5V16fZbLsnL9N3wFqqIm/nIG43FjUFkFh9Epzp/kzUGUnJxQ==
+
 ms@2.0.0:
   version "2.0.0"
   resolved "https://registry.yarnpkg.com/ms/-/ms-2.0.0.tgz#5608aeadfc00be6c2901df5f9861788de0d597c8"
@@ -3657,6 +3697,16 @@ node-releases@^1.1.71:
   resolved "https://registry.yarnpkg.com/node-releases/-/node-releases-1.1.72.tgz#14802ab6b1039a79a0c7d662b610a5bbd76eacbe"
   integrity sha512-LLUo+PpH3dU6XizX3iVoubUNheF/owjXCZZ5yACDxNnPtgFuludV1ZL3ayK1kVep42Rmm0+R9/Y60NQbZ2bifw==
 
+normalize-package-data@^2.3.2:
+  version "2.5.0"
+  resolved "https://registry.yarnpkg.com/normalize-package-data/-/normalize-package-data-2.5.0.tgz#e66db1838b200c1dfc233225d12cb36520e234a8"
+  integrity sha512-/5CMN3T0R4XTj4DcGaexo+roZSdSFW/0AOOTROrjxzCG1wrWXEsGbRKevjlIL+ZDE4sZlJr5ED4YW0yqmkK+eA==
+  dependencies:
+    hosted-git-info "^2.1.4"
+    resolve "^1.10.0"
+    semver "2 || 3 || 4 || 5"
+    validate-npm-package-license "^3.0.1"
+
 normalize-path@^2.1.1:
   version "2.1.1"
   resolved "https://registry.yarnpkg.com/normalize-path/-/normalize-path-2.1.1.tgz#1ab28b556e198363a8c1a6f7e6fa20137fe6aed9"
@@ -3669,6 +3719,21 @@ normalize-path@^3.0.0, normalize-path@~3.0.0:
   resolved "https://registry.yarnpkg.com/normalize-path/-/normalize-path-3.0.0.tgz#0dcd69ff23a1c9b11fd0978316644a0388216a65"
   integrity sha512-6eZs5Ls3WtCisHWp9S2GUy8dqkpGi4BVSz3GaqiE6ezub0512ESztXUwUB6C6IKbQkY2Pnb/mD4WYojCRwcwLA==
 
+npm-run-all@^4.1.5:
+  version "4.1.5"
+  resolved "https://registry.yarnpkg.com/npm-run-all/-/npm-run-all-4.1.5.tgz#04476202a15ee0e2e214080861bff12a51d98fba"
+  integrity sha512-Oo82gJDAVcaMdi3nuoKFavkIHBRVqQ1qvMb+9LHk/cF4P6B2m8aP04hGf7oL6wZ9BuGwX1onlLhpuoofSyoQDQ==
+  dependencies:
+    ansi-styles "^3.2.1"
+    chalk "^2.4.1"
+    cross-spawn "^6.0.5"
+    memorystream "^0.3.1"
+    minimatch "^3.0.4"
+    pidtree "^0.3.0"
+    read-pkg "^3.0.0"
+    shell-quote "^1.6.1"
+    string.prototype.padend "^3.0.0"
+
 npm-run-path@^2.0.0:
   version "2.0.2"
   resolved "https://registry.yarnpkg.com/npm-run-path/-/npm-run-path-2.0.2.tgz#35a9232dfa35d7067b4cb2ddf2357b1871536c5f"
@@ -3899,6 +3964,14 @@ parse-asn1@^5.0.0, parse-asn1@^5.1.5:
     pbkdf2 "^3.0.3"
     safe-buffer "^5.1.1"
 
+parse-json@^4.0.0:
+  version "4.0.0"
+  resolved "https://registry.yarnpkg.com/parse-json/-/parse-json-4.0.0.tgz#be35f5425be1f7f6c747184f98a788cb99477ee0"
+  integrity sha1-vjX1Qlvh9/bHRxhPmKeIy5lHfuA=
+  dependencies:
+    error-ex "^1.3.1"
+    json-parse-better-errors "^1.0.1"
+
 parse-json@^5.0.0:
   version "5.2.0"
   resolved "https://registry.yarnpkg.com/parse-json/-/parse-json-5.2.0.tgz#c76fc66dee54231c962b22bcc8a72cf2f99753cd"
@@ -3987,6 +4060,13 @@ path-to-regexp@0.1.7:
   resolved "https://registry.yarnpkg.com/path-to-regexp/-/path-to-regexp-0.1.7.tgz#df604178005f522f15eb4490e7247a1bfaa67f8c"
   integrity sha1-32BBeABfUi8V60SQ5yR6G/qmf4w=
 
+path-type@^3.0.0:
+  version "3.0.0"
+  resolved "https://registry.yarnpkg.com/path-type/-/path-type-3.0.0.tgz#cef31dc8e0a1a3bb0d105c0cd97cf3bf47f4e36f"
+  integrity sha512-T2ZUsdZFHgA3u4e5PfPbjd7HDDpxPnQb5jN0SrDsjNSuVXHJqtwTnWqG0B1jZrgmJ/7lj1EmVIByWt1gxGkWvg==
+  dependencies:
+    pify "^3.0.0"
+
 path-type@^4.0.0:
   version "4.0.0"
   resolved "https://registry.yarnpkg.com/path-type/-/path-type-4.0.0.tgz#84ed01c0a7ba380afe09d90a8c180dcd9d03043b"
@@ -4034,11 +4114,21 @@ picomatch@^2.0.4, picomatch@^2.2.1, picomatch@^2.2.3:
   resolved "https://registry.yarnpkg.com/picomatch/-/picomatch-2.2.3.tgz#465547f359ccc206d3c48e46a1bcb89bf7ee619d"
   integrity sha512-KpELjfwcCDUb9PeigTs2mBJzXUPzAuP2oPcA989He8Rte0+YUAjw1JVedDhuTKPkHjSYzMN3npC9luThGYEKdg==
 
+pidtree@^0.3.0:
+  version "0.3.1"
+  resolved "https://registry.yarnpkg.com/pidtree/-/pidtree-0.3.1.tgz#ef09ac2cc0533df1f3250ccf2c4d366b0d12114a"
+  integrity sha512-qQbW94hLHEqCg7nhby4yRC7G2+jYHY4Rguc2bjw7Uug4GIJuu1tvf2uHaZv5Q8zdt+WKJ6qK1FOI6amaWUo5FA==
+
 pify@^2.0.0:
   version "2.3.0"
   resolved "https://registry.yarnpkg.com/pify/-/pify-2.3.0.tgz#ed141a6ac043a849ea588498e7dca8b15330e90c"
   integrity sha1-7RQaasBDqEnqWISY59yosVMw6Qw=
 
+pify@^3.0.0:
+  version "3.0.0"
+  resolved "https://registry.yarnpkg.com/pify/-/pify-3.0.0.tgz#e5a4acd2c101fdf3d9a4d07f0dbc4db49dd28176"
+  integrity sha1-5aSs0sEB/fPZpNB/DbxNtJ3SgXY=
+
 pify@^4.0.1:
   version "4.0.1"
   resolved "https://registry.yarnpkg.com/pify/-/pify-4.0.1.tgz#4b2cd25c50d598735c50292224fd8c6df41e3231"
@@ -4288,6 +4378,15 @@ raw-body@2.4.0:
     iconv-lite "0.4.24"
     unpipe "1.0.0"
 
+read-pkg@^3.0.0:
+  version "3.0.0"
+  resolved "https://registry.yarnpkg.com/read-pkg/-/read-pkg-3.0.0.tgz#9cbc686978fee65d16c00e2b19c237fcf6e38389"
+  integrity sha1-nLxoaXj+5l0WwA4rGcI3/Pbjg4k=
+  dependencies:
+    load-json-file "^4.0.0"
+    normalize-package-data "^2.3.2"
+    path-type "^3.0.0"
+
 readable-stream@^2.0.1, readable-stream@^2.0.2:
   version "2.3.7"
   resolved "https://registry.yarnpkg.com/readable-stream/-/readable-stream-2.3.7.tgz#1eca1cf711aef814c04f62252a36a62f6cb23b57"
@@ -4326,6 +4425,13 @@ readdirp@~3.5.0:
   dependencies:
     picomatch "^2.2.1"
 
+readdirp@~3.6.0:
+  version "3.6.0"
+  resolved "https://registry.yarnpkg.com/readdirp/-/readdirp-3.6.0.tgz#74a370bd857116e245b29cc97340cd431a02a6c7"
+  integrity sha512-hOS089on8RduqdbhvQ5Z37A0ESjsqz6qnRcffsMU3495FuTdqSm+7bhJ29JvIOsBDEEnan5DPu9t3To9VRlMzA==
+  dependencies:
+    picomatch "^2.2.1"
+
 rechoir@^0.7.0:
   version "0.7.0"
   resolved "https://registry.yarnpkg.com/rechoir/-/rechoir-0.7.0.tgz#32650fd52c21ab252aa5d65b19310441c7e03aca"
@@ -4444,7 +4550,7 @@ resolve-url@^0.2.1:
   resolved "https://registry.yarnpkg.com/resolve-url/-/resolve-url-0.2.1.tgz#2c637fe77c893afd2a663fe21aa9080068e2052a"
   integrity sha1-LGN/53yJOv0qZj/iGqkIAGjiBSo=
 
-resolve@^1.9.0:
+resolve@^1.10.0, resolve@^1.9.0:
   version "1.20.0"
   resolved "https://registry.yarnpkg.com/resolve/-/resolve-1.20.0.tgz#629a013fb3f70755d6f0b7935cc1c2c5378b1975"
   integrity sha512-wENBPt4ySzg4ybFQW2TT1zMQucPK95HSh/nq2CFTZVOGut2+pQvSsgtda4d26YrYcr067wjbmzOG8byDPBX63A==
@@ -4503,6 +4609,13 @@ rxjs@^6.6.3:
   dependencies:
     tslib "^1.9.0"
 
+sade@^1.7.4:
+  version "1.7.4"
+  resolved "https://registry.yarnpkg.com/sade/-/sade-1.7.4.tgz#ea681e0c65d248d2095c90578c03ca0bb1b54691"
+  integrity sha512-y5yauMD93rX840MwUJr7C1ysLFBgMspsdTo4UVrDg3fXDvtwOyIqykhVAAm6fk/3au77773itJStObgK+LKaiA==
+  dependencies:
+    mri "^1.1.0"
+
 safe-buffer@5.1.2, safe-buffer@~5.1.0, safe-buffer@~5.1.1:
   version "5.1.2"
   resolved "https://registry.yarnpkg.com/safe-buffer/-/safe-buffer-5.1.2.tgz#991ec69d296e0313747d59bdfd2b745c35f8828d"
@@ -4579,7 +4692,7 @@ selfsigned@^1.10.8:
   dependencies:
     node-forge "^0.10.0"
 
-semver@^5.5.0:
+"semver@2 || 3 || 4 || 5", semver@^5.5.0:
   version "5.7.1"
   resolved "https://registry.yarnpkg.com/semver/-/semver-5.7.1.tgz#a954f931aeba508d307bbf069eff0c01c96116f7"
   integrity sha512-sauaDf/PZdVgrLTNYHRtpXa1iRiKcaebiKQ1BJdpQlWH2lCvexQdX55snPFyK7QzpudqbCI0qXFfOasHdyNDGQ==
@@ -4714,6 +4827,11 @@ shebang-regex@^3.0.0:
   resolved "https://registry.yarnpkg.com/shebang-regex/-/shebang-regex-3.0.0.tgz#ae16f1644d873ecad843b0307b143362d4c42172"
   integrity sha512-7++dFhtcx3353uBaq8DDR4NuxBetBzC7ZQOhmTQInHEd6bSrXdiEyzCvG07Z44UYdLShWUyXt5M/yhz8ekcb1A==
 
+shell-quote@^1.6.1:
+  version "1.7.2"
+  resolved "https://registry.yarnpkg.com/shell-quote/-/shell-quote-1.7.2.tgz#67a7d02c76c9da24f99d20808fcaded0e0e04be2"
+  integrity sha512-mRz/m/JVscCrkMyPqHc/bczi3OQHkLTqXHEFu0zDhK/qfv3UcOA4SVmRCLmos4bhjr9ekVQubj/R7waKapmiQg==
+
 signal-exit@^3.0.0, signal-exit@^3.0.3:
   version "3.0.3"
   resolved "https://registry.yarnpkg.com/signal-exit/-/signal-exit-3.0.3.tgz#a1410c2edd8f077b08b4e253c8eacfcaf057461c"
@@ -4867,6 +4985,32 @@ source-map@^0.7.3, source-map@~0.7.2:
   resolved "https://registry.yarnpkg.com/source-map/-/source-map-0.7.3.tgz#5302f8169031735226544092e64981f751750383"
   integrity sha512-CkCj6giN3S+n9qrYiBTX5gystlENnRW5jZeNLHpe6aue+SrHcG5VYwujhW9s4dY31mEGsxBDrHR6oI69fTXsaQ==
 
+spdx-correct@^3.0.0:
+  version "3.1.1"
+  resolved "https://registry.yarnpkg.com/spdx-correct/-/spdx-correct-3.1.1.tgz#dece81ac9c1e6713e5f7d1b6f17d468fa53d89a9"
+  integrity sha512-cOYcUWwhCuHCXi49RhFRCyJEK3iPj1Ziz9DpViV3tbZOwXD49QzIN3MpOLJNxh2qwq2lJJZaKMVw9qNi4jTC0w==
+  dependencies:
+    spdx-expression-parse "^3.0.0"
+    spdx-license-ids "^3.0.0"
+
+spdx-exceptions@^2.1.0:
+  version "2.3.0"
+  resolved "https://registry.yarnpkg.com/spdx-exceptions/-/spdx-exceptions-2.3.0.tgz#3f28ce1a77a00372683eade4a433183527a2163d"
+  integrity sha512-/tTrYOC7PPI1nUAgx34hUpqXuyJG+DTHJTnIULG4rDygi4xu/tfgmq1e1cIRwRzwZgo4NLySi+ricLkZkw4i5A==
+
+spdx-expression-parse@^3.0.0:
+  version "3.0.1"
+  resolved "https://registry.yarnpkg.com/spdx-expression-parse/-/spdx-expression-parse-3.0.1.tgz#cf70f50482eefdc98e3ce0a6833e4a53ceeba679"
+  integrity sha512-cbqHunsQWnJNE6KhVSMsMeH5H/L9EpymbzqTQ3uLwNCLZ1Q481oWaofqH7nO6V07xlXwY6PhQdQ2IedWx/ZK4Q==
+  dependencies:
+    spdx-exceptions "^2.1.0"
+    spdx-license-ids "^3.0.0"
+
+spdx-license-ids@^3.0.0:
+  version "3.0.9"
+  resolved "https://registry.yarnpkg.com/spdx-license-ids/-/spdx-license-ids-3.0.9.tgz#8a595135def9592bda69709474f1cbeea7c2467f"
+  integrity sha512-Ki212dKK4ogX+xDo4CtOZBVIwhsKBEfsEEcwmJfLQzirgc2jIWdzg40Unxz/HzEUqM1WFzVlQSMF9kZZ2HboLQ==
+
 spdy-transport@^3.0.0:
   version "3.0.0"
   resolved "https://registry.yarnpkg.com/spdy-transport/-/spdy-transport-3.0.0.tgz#00d4863a6400ad75df93361a1608605e5dcdcf31"
@@ -4960,6 +5104,15 @@ string-width@^4.2.0:
     is-fullwidth-code-point "^3.0.0"
     strip-ansi "^6.0.0"
 
+string.prototype.padend@^3.0.0:
+  version "3.1.2"
+  resolved "https://registry.yarnpkg.com/string.prototype.padend/-/string.prototype.padend-3.1.2.tgz#6858ca4f35c5268ebd5e8615e1327d55f59ee311"
+  integrity sha512-/AQFLdYvePENU3W5rgurfWSMU6n+Ww8n/3cUt7E+vPBB/D7YDG8x+qjoFs4M/alR2bW7Qg6xMjVwWUOvuQ0XpQ==
+  dependencies:
+    call-bind "^1.0.2"
+    define-properties "^1.1.3"
+    es-abstract "^1.18.0-next.2"
+
 string.prototype.trimend@^1.0.4:
   version "1.0.4"
   resolved "https://registry.yarnpkg.com/string.prototype.trimend/-/string.prototype.trimend-1.0.4.tgz#e75ae90c2942c63504686c18b287b4a0b1a45f80"
@@ -5059,6 +5212,21 @@ supports-color@^7.0.0, supports-color@^7.1.0:
   dependencies:
     has-flag "^4.0.0"
 
+svelte-check@^2.1.0:
+  version "2.1.0"
+  resolved "https://registry.yarnpkg.com/svelte-check/-/svelte-check-2.1.0.tgz#3ee8ad86068256346ebca862bbee8417a757fc53"
+  integrity sha512-kKLXkFt0XZTn+O1fnilGTQ1SFLsOFF+lXp1YjPfeN9nX+Y3ZpELtZSQCkbuK6HMkWugFvsOM17FCOSa1mfrEFA==
+  dependencies:
+    chalk "^4.0.0"
+    chokidar "^3.4.1"
+    glob "^7.1.6"
+    import-fresh "^3.2.1"
+    minimist "^1.2.5"
+    sade "^1.7.4"
+    source-map "^0.7.3"
+    svelte-preprocess "^4.0.0"
+    typescript "*"
+
 svelte-dev-helper@^1.1.9:
   version "1.1.9"
   resolved "https://registry.yarnpkg.com/svelte-dev-helper/-/svelte-dev-helper-1.1.9.tgz#7d187db5c6cdbbd64d75a32f91b8998bde3273c3"
@@ -5078,7 +5246,7 @@ svelte-loader@^3.1.1:
     svelte-dev-helper "^1.1.9"
     svelte-hmr "^0.12.3"
 
-svelte-preprocess@^4.7.3:
+svelte-preprocess@^4.0.0, svelte-preprocess@^4.7.3:
   version "4.7.3"
   resolved "https://registry.yarnpkg.com/svelte-preprocess/-/svelte-preprocess-4.7.3.tgz#454fa059c2400b15e7a3caeca18993cff9df0e96"
   integrity sha512-Zx1/xLeGOIBlZMGPRCaXtlMe4ZA0faato5Dc3CosEqwu75MIEPuOstdkH6cy+RYTUYynoxzNaDxkPX4DbrPwRA==
@@ -5283,6 +5451,11 @@ type-is@~1.6.17, type-is@~1.6.18:
     media-typer "0.3.0"
     mime-types "~2.1.24"
 
+typescript@*:
+  version "4.3.2"
+  resolved "https://registry.yarnpkg.com/typescript/-/typescript-4.3.2.tgz#399ab18aac45802d6f2498de5054fcbbe716a805"
+  integrity sha512-zZ4hShnmnoVnAHpVHWpTcxdv7dWP60S2FsydQLV8V5PbS3FifjWFFRiHSWpDJahly88PRyV5teTSLoq4eG7mKw==
+
 typescript@^4.2.4:
   version "4.2.4"
   resolved "https://registry.yarnpkg.com/typescript/-/typescript-4.2.4.tgz#8610b59747de028fda898a8aef0e103f156d0961"
@@ -5408,6 +5581,14 @@ v8-compile-cache@^2.0.3, v8-compile-cache@^2.2.0:
   resolved "https://registry.yarnpkg.com/v8-compile-cache/-/v8-compile-cache-2.3.0.tgz#2de19618c66dc247dcfb6f99338035d8245a2cee"
   integrity sha512-l8lCEmLcLYZh4nbunNZvQCJc5pv7+RCwa8q/LdUx8u7lsWvPDKmpodJAJNwkAhJC//dFY48KuIEmjtd4RViDrA==
 
+validate-npm-package-license@^3.0.1:
+  version "3.0.4"
+  resolved "https://registry.yarnpkg.com/validate-npm-package-license/-/validate-npm-package-license-3.0.4.tgz#fc91f6b9c7ba15c857f4cb2c5defeec39d4f410a"
+  integrity sha512-DpKm2Ui/xN7/HQKCtpZxoRWBhZ9Z0kqtygG8XCgNQ8ZlDnxuQmWhj566j8fN4Cu3/JmbhsDo7fcAJq4s9h27Ew==
+  dependencies:
+    spdx-correct "^3.0.0"
+    spdx-expression-parse "^3.0.0"
+
 vary@~1.1.2:
   version "1.1.2"
   resolved "https://registry.yarnpkg.com/vary/-/vary-1.1.2.tgz#2299f02c6ded30d4a5961b0b9f74524a18f634fc"