refactor: separate traffic and bikeshare components

src/layers/traffic/index.js

@@ -0,0 +1,63 @@
+import { TRAFFIC_TIMING_ENABLED } from './policy.js';
+import { createStyle } from './style.js';
+import { createTiming } from './timing.js';
+import { createModel } from './model.js';
+import { createIngestion } from './ingestion.js';
+import { createAnimation } from './animation.js';
+import { createViewport } from './viewport.js';
+import { createFlow } from './flow.js';
+import { createRendering } from './rendering.js';
+import { createControls } from './controls.js';
+import { createLifecycle } from './lifecycle.js';
+import { createState } from './state.js';
+
+/** Construct one layer with its own scene state and supplied application services. */
+export function createTrafficLayer({ services, source }) {
+  if (
+    ![
+      'requestRoads',
+      'getStatus',
+      'fetchFlowForBounds',
+      'getFlowSessionStats',
+      'resetFlowTileCache',
+    ].every((key) => typeof source?.[key] === 'function')
+  )
+    throw new TypeError('A traffic source is required');
+  const state = createState({ services });
+  const parts = {};
+  const context = { state, services, parts, source };
+  parts.style = createStyle(context);
+  parts.timing = createTiming(context);
+  parts.model = createModel(context);
+  parts.ingestion = createIngestion(context);
+  parts.animation = createAnimation(context);
+  parts.viewport = createViewport(context);
+  parts.flow = createFlow(context);
+  parts.rendering = createRendering(context);
+  parts.controls = createControls(context);
+  parts.lifecycle = createLifecycle(context);
+  state._parseRoads = TRAFFIC_TIMING_ENABLED
+    ? (data, trace) =>
+        trace
+          ? parts.timing.parseRoadsTimed(data, trace)
+          : parts.model.parseRoads(data)
+    : parts.model.parseRoads;
+
+  state._loadRoadsForBounds = TRAFFIC_TIMING_ENABLED
+    ? parts.timing.loadRoadsForBoundsTimed
+    : parts.ingestion.loadRoadsForBounds;
+
+  return Object.assign(
+    {},
+    parts.controls.methods,
+    parts.lifecycle.methods,
+    parts.ingestion?.methods,
+    {
+      getTrafficTimingDiagnostics: parts.timing.getTrafficTimingDiagnostics,
+      deriveTrafficFlowError: parts.flow.deriveTrafficFlowError,
+      trafficFeedPresentation: parts.model.trafficFeedPresentation,
+    },
+  );
+}
+
+export { createTrafficSource } from './source.js';