fix certificate selection

backend/src/DataSource/MqttSource.ts

@@ -43,7 +43,7 @@ export class MqttSource implements DataSource<MqttOptions> {
     try {
       url = Url.parse(urlStr)
     } catch (error) {
-      this.stateMachine.setError(error)
+      this.stateMachine.setError(error as Error)
       throw error
     }
 

backend/tsconfig.json

@@ -1,11 +1,15 @@
 {
   "compileOnSave": true,
   "compilerOptions": {
+    "skipLibCheck": true,
     "noImplicitAny": true,
     "strictNullChecks": true,
     "outDir": "./build",
     "strict": true,
-    "lib": ["es2017", "dom"],
+    "lib": [
+      "es2017",
+      "dom"
+    ],
     "sourceMap": true
   },
   "includes": [
@@ -18,4 +22,4 @@
     "**/*.d.ts",
     "typings"
   ]
-}
+}