Add find parent modules helper

Author: kisenka

_speaker-tips/find-parent-modules.js

@@ -0,0 +1,9 @@
+const HarmonyImportSpecifierDependency = require('webpack/lib/dependencies/HarmonyImportSpecifierDependency');
+
+module.exports = (cssModule, modules) => {
+  modules.forEach((parentModule) => {
+    parentModule.dependencies
+      .filter((d) => d instanceof HarmonyImportSpecifierDependency)
+      .filter((d) => d.module.resource === cssModule.resource)
+  });
+};