wijmo.angular2.chart.finance is an external TypeScript module that can be imported to your code using its ambient module name. For example:

import * as wjFinance from 'wijmo/wijmo.angular2.chart.finance';
 
@Component({
    directives: [wjFinance.WjFinancialChart, wjFinance.WjFinancialChartSeries],
    template: `
      <wj-financial-chart [itemsSource]="data" [bindingX]="'x'">
          <wj-financial-chart-series [binding]="'y'"></wj-financial-chart-series>
      </wj-financial-chart>`,
    selector: 'my-cmp',
})
export class MyCmp {
    data: any[];
}