d3v4 + Typescript + angular2错误使用d3.line().x((d) => {function})

So I have this...

所以我有这个…

import { D3Service, D3, Selection } from 'd3-ng2-service';

interface ChartData {
    q: number,
    p: number
} 

export class GraphComponent implements OnInit{
   private d3;
   private x1;
   private y;

    constructor(element: ElementRef, d3Service: D3Service) { 
        this.d3 = d3Service.getD3(); 
        let d3 = this.d3;


    this.y = d3.scaleLinear()
    .domain([0,100])
    .range([330, 20])
    ;
    this.x1 = d3.scaleLinear()
    .range([0, 100])
    ;
}

   render() {
      let y = this.y;
      let x1 = this.x1;
      let data = [{p:1,q:1}, {p:0.5,q:2}]

       var line = d3.line()
          .x((d: ChartData) => {return x1(d.q);})
          .y((d: ChartData) => {return y(d.p);});

        svg.append("path")
          .data(data)
          .attr("class", "line")
          .attr("d", line);
   }
}
import { D3Servic