How to use encoding-down - 6 common examples

function encoder (db: LevelUp$AbstractStorage) {
  return encodingDown(db, options);
}

constructor (deps: Injector) {
    this.config = deps(Config)

    let backend
    if (this.config.memdownPersist || this.config.devMode) {
      backend = memdown()
    } else {
      backend = leveldown(resolvePath(this.config.codiusRoot, 'codius.db'))
    }
    this.db = levelup(encode(backend, { valueEncoding: 'json' }))
  }

public constructor(file: string) {
		logger('opening file', { file });
		this._db = levelup(EncodingDown(RocksDB(file), { valueEncoding: 'json' }));
	}

constructor(filename) {
    this.db = levelup(encode(leveldown(filename), {
      valueEncoding: 'json'
    }));
  }

async setup(model?: FederatedModel) {
    this.db = await LevelUp(
        EncodingDown(LevelDown(this.dataDir), {valueEncoding: 'json'}));
    try {
      this.modelId = await this.db.get('currentModelId');
    } catch {
      const dict = await model.setup();
      await this.writeNewVars(dict.vars as tf.Tensor[]);
    }
  }