_upgradeDb()

in workbox-v4.3.1/workbox-background-sync.dev.js [204:220]

• 15 lines of code
• 4 McCabe index (conditional complexity)

    _upgradeDb(event) {
      const db = event.target.result;

      if (event.oldVersion > 0 && event.oldVersion < DB_VERSION) {
        if (db.objectStoreNames.contains(OBJECT_STORE_NAME)) {
          db.deleteObjectStore(OBJECT_STORE_NAME);
        }
      }

      const objStore = db.createObjectStore(OBJECT_STORE_NAME, {
        autoIncrement: true,
        keyPath: 'id'
      });
      objStore.createIndex(INDEXED_PROP, INDEXED_PROP, {
        unique: false
      });
    }