refactor(app): share application components and request services

src/data/traffic.js

@@ -1,10 +1,21 @@
+import { createSourceSlot } from '../app/sourceSlot.js';
 import { createTrafficSource } from '../layers/traffic/source.js';
 import { createTrafficLayer } from '../layers/traffic/index.js';
 import * as credits from './dataCredits.js';
 import * as render from '../renderGovernor.js';
 
+const sourceSlot = createSourceSlot(
+  createTrafficSource(),
+  ['requestRoads', 'getStatus', 'fetchFlowForBounds'],
+  'Traffic source',
+  {
+    getFlowSessionStats: () => ({ tilesFetched: 0 }),
+    resetFlowTileCache: () => {},
+  },
+);
+export const configureTrafficSource = sourceSlot.configure;
 const layer = createTrafficLayer({
-  source: createTrafficSource(),
+  source: sourceSlot.source,
   services: { credits, render },
 });
 export const getTrafficTimingDiagnostics = layer.getTrafficTimingDiagnostics;