updated typescript to 3.6.2, seems to work ok

package-lock.json

@@ -1160,9 +1160,9 @@
       }
     },
     "typescript": {
-      "version": "3.5.3",
-      "resolved": "https://registry.npmjs.org/typescript/-/typescript-3.5.3.tgz",
-      "integrity": "sha512-ACzBtm/PhXBDId6a6sDJfroT2pOWt/oOnk4/dElG5G33ZL776N3Y6/6bKZJBFpd+b05F3Ct9qDjMeJmRWtE2/g==",
+      "version": "3.6.2",
+      "resolved": "https://registry.npmjs.org/typescript/-/typescript-3.6.2.tgz",
+      "integrity": "sha512-lmQ4L+J6mnu3xweP8+rOrUwzmN+MRAj7TgtJtDaXE5PMyX2kCrklhg3rvOsOIfNeAWMQWO2F1GPc1kMD2vLAfw==",
       "dev": true
     },
     "typescript-formatter": {

package.json

@@ -22,7 +22,7 @@
     "mocha": "^5.2.x",
     "octokat": "^0.10.0",
     "pngjs": "^3.3.3",
-    "typescript": "^3.5.3",
+    "typescript": "^3.6.2",
     "typescript-formatter": "^7.2.2",
     "wavedrom-cli": "^0.5.x"
   },