Remove dependents from cache when dependency updated

src/utils/ImportCache.ts

@@ -3,12 +3,16 @@ import { ScriptUrl } from "../Script/ScriptUrl";
 const importCache: { [hash: string]: ScriptUrl[] } = {};
 
 export class ImportCache {
-  static get(hash: string): ScriptUrl[] {
-    return importCache[hash];
+  static get(hash: string): ScriptUrl[] | null {
+    return importCache[hash] || null;
   }
 
   static store(hash: string, value: ScriptUrl[]): void {
     if (importCache[hash]) return;
     importCache[hash] = value;
   }
+
+  static remove(hash: string): void {
+    delete importCache[hash];
+  }
 }