description

# transactionStore method Null safety

Transaction transactionStore (

1. String storeName,
2. String mode

)

## Implementation

    Transaction transactionStore(String storeName, String mode) {
      if (mode != 'readonly' && mode != 'readwrite') {
        throw new ArgumentError(mode);
      }
      // Try and create a transaction with a string mode.  Browsers that expect a
      // numeric mode tend to convert the string into a number.  This fails
      // silently, resulting in zero ('readonly').
      return _transaction(storeName, mode);
    }