add etas resolver on shuttle object

src/resolvers.ts

@@ -112,6 +112,34 @@ export const resolvers: Resolvers<ServerContext> = {
 
       return etaForNextStop;
     },
+    etas: async (parent, args, contextValue, info) => {
+      const etasForShuttle = await contextValue.repository.getEtasForShuttleId(parent.id);
+      if (!etasForShuttle) return null;
+
+      const computedEtas = await Promise.all(etasForShuttle.map(async ({
+        secondsRemaining,
+        stopId,
+      }): Promise<Eta | null> => {
+        const stop = await contextValue.repository.getStopById(stopId);
+        if (stop === null) return null;
+
+        return {
+          secondsRemaining,
+          stop: {
+            coordinates: stop.coordinates,
+            id: stop.id,
+            name: stop.name,
+          },
+          shuttle: parent,
+        }
+      }));
+
+      if (computedEtas.every((eta) => eta !== null)) {
+        return computedEtas;
+      }
+
+      return [];
+    }
   },
   Stop: {
     orderedStops: async (parent, args, contextValue, info) => {
@@ -140,11 +168,11 @@ export const resolvers: Resolvers<ServerContext> = {
         };
       }));
 
-      if (!computedOrderedStops.every((value) => value !== null)) {
-        return [];
+      if (computedOrderedStops.every((value) => value !== null)) {
+        return computedOrderedStops as OrderedStop[];
       }
 
-      return computedOrderedStops as OrderedStop[];
+      return [];
     }
   },
   OrderedStop: {
@@ -192,5 +220,5 @@ export const resolvers: Resolvers<ServerContext> = {
         }
       }
     },
-  }
+  },
 };