notesnook/packages/core/database/migrator.js

import { CURRENT_DATABASE_VERSION } from "../common";
import { migrations } from "../migrations";

class Migrator {
  async migrate(collections, get, version) {
    await Promise.all(
      collections.map(async (collection) => {
        if (!collection.index || !collection.dbCollection) return;
        for (var i = 0; i < collection.index.length; ++i) {
          let id = collection.index[i];
          let item = get(id);
          if (!item) {
            continue;
          }

          if (item.deleted && !item.type) {
            await collection.dbCollection?._collection?.addItem(item);
            continue;
          }
          const migrate = migrations[version][item.type || collection.type];
          if (migrate) item = migrate(item);

          if (!!collection.dbCollection.merge) {
            await collection.dbCollection.merge(item);
          } else {
            await collection.dbCollection.add(item);
          }
        }
      })
    );
    return true;
  }
}
export default Migrator;