nl_tokens: Constuct a new instance .
pl_tokens: function Contract ( config ) { _classCallCheck ( this , Contract ) ; this . _config = config ; this . _web3 = config . web3 ; this . _bytecode = config . contract . bytecode ; this . _interface = JSON . parse ( config . contract . interface ) ; this . _contract = this . _web3 . eth . contract ( this . _interface ) ; this . _account = config . <mask> ; this . _gas = config . gas ; this . _logger = DUMMY_LOGGER ; }