dataStateChange event signature is different than in your documentation

public dataStateChange(state : DataStateChangeEventArgs) {
      this.orderService.execute(state).then(( gridData ) => {
          if(this.grid) {
            this.grid.dataSource = gridData
          }
        });
    }

This is the error:

Types of property 'dataStateChange' are incompatible.
  Type '(state: DataStateChangeEventArgs) => void' is not assignable to type 'EmitType<DataStateChangeEventArgs>'.
    Type '(state: DataStateChangeEventArgs) => void' is not assignable to type '(arg?: DataStateChangeEventArgs | undefined, ...rest: any[]) => void'.
      Types of parameters 'state' and 'arg' are incompatible.
        Type 'DataStateChangeEventArgs | undefined' is not assignable to type 'DataStateChangeEventArgs'.
          Type 'undefined' is not assignable to type 'DataStateChangeEventArgs'.