chore: install cssbundling rails and set up compilation

spec/dummy/node_modules/postcss-cli/lib/DependencyGraph.js

@@ -0,0 +1,30 @@
+import path from 'path'
+import { DepGraph } from 'dependency-graph'
+
+export default function createDependencyGraph() {
+  const graph = new DepGraph()
+  return {
+    add(message) {
+      message.parent = path.resolve(message.parent)
+      graph.addNode(message.parent)
+
+      if (message.type === 'dir-dependency') {
+        message.dir = path.resolve(message.dir)
+        graph.addNode(message.dir)
+        graph.addDependency(message.parent, message.dir)
+      } else {
+        message.file = path.resolve(message.file)
+        graph.addNode(message.file)
+        graph.addDependency(message.parent, message.file)
+      }
+
+      return message
+    },
+    dependantsOf(node) {
+      node = path.resolve(node)
+
+      if (graph.hasNode(node)) return graph.dependantsOf(node)
+      return []
+    },
+  }
+}