Initial Typescripting for Element Desktop

package.json

@@ -1,7 +1,7 @@
 {
   "name": "element-desktop",
   "productName": "Element",
-  "main": "src/electron-main.js",
+  "main": "lib/electron-main.js",
   "version": "1.7.31",
   "description": "A feature-rich client for Matrix.org",
   "author": "Element",
@@ -18,12 +18,13 @@
     "mkdirs": "mkdirp packages deploys",
     "fetch": "yarn run mkdirs && node scripts/fetch-package.js",
     "asar-webapp": "asar p webapp webapp.asar",
-    "start": "electron .",
+    "start": "yarn run tsbuild && electron .",
     "lint": "eslint src/ scripts/ hak/",
     "build:native": "yarn run hak",
     "build32": "electron-builder --ia32",
     "build64": "electron-builder --x64",
-    "build": "electron-builder",
+    "build": "yarn run tsbuild && electron-builder",
+    "tsbuild": "tsc",
     "docker:setup": "docker build -t element-desktop-dockerbuild dockerbuild",
     "docker:build:native": "scripts/in-docker.sh yarn run hak",
     "docker:build": "scripts/in-docker.sh yarn run build",
@@ -42,7 +43,10 @@
     "request": "^2.88.2"
   },
   "devDependencies": {
+    "@types/auto-launch": "^5.0.1",
+    "@types/counterpart": "^0.18.1",
     "asar": "^2.0.1",
+    "electron": "12.0.11",
     "electron-builder": "22.11.4",
     "electron-builder-squirrel-windows": "22.11.4",
     "electron-devtools-installer": "^3.1.1",
@@ -60,7 +64,8 @@
     "npm": "^6.14.11",
     "rimraf": "^3.0.2",
     "semver": "^7.3.4",
-    "tar": "^6.1.0"
+    "tar": "^6.1.0",
+    "typescript": "^4.1.3"
   },
   "hakDependencies": {
     "matrix-seshat": "^2.2.3",