Update typescript to v3

package-lock.json

@@ -29808,9 +29808,9 @@
       "dev": true
     },
     "typescript": {
-      "version": "2.9.2",
-      "resolved": "https://registry.npmjs.org/typescript/-/typescript-2.9.2.tgz",
-      "integrity": "sha512-Gr4p6nFNaoufRIY4NMdpQRNmgxVIGMs4Fcu/ujdYk3nAZqk7supzBE9idmvfZIlH/Cuj//dvi+019qEue9lV0w==",
+      "version": "3.4.5",
+      "resolved": "https://registry.npmjs.org/typescript/-/typescript-3.4.5.tgz",
+      "integrity": "sha512-YycBxUb49UUhdNMU5aJ7z5Ej2XGmaIBL0x34vZ82fn3hGvD+bgrMrVDpatgz2f7YxUMJxMkbWxJZeAvDxVe7Vw==",
       "dev": true
     },
     "ua-parser-js": {

package.json

@@ -75,7 +75,7 @@
     "tinyify": "^2.5.0",
     "touch": "^3.1.0",
     "tsify": "^4.0.1",
-    "typescript": "^2.9.2",
+    "typescript": "^3.4.5",
     "verdaccio": "^3.11.6",
     "watchify": "^3.11.1",
     "wdio-mocha-framework": "^0.6.4",

packages/@uppy/companion/package.json

@@ -79,7 +79,7 @@
     "@types/ws": "^3.2.1",
     "nodemon": "^1.17.5",
     "supertest": "3.0.0",
-    "typescript": "^2.9.2"
+    "typescript": "^3.4.5"
   },
   "files": [
     "lib/"