问模块未找到错误无法解析angular 7

EN

module not found error can't resolve 'd3' in '.../Angular_Example/angular-d3-graph-example-master/src/app/d3'

import { Node, Link, ForceDirectedGraph } from './models';
import * as d3 from 'd3';

@Injectable()
export class D3Service {
  constructor() { }


  applyZoomableBehaviour(svgElement, containerElement) {
    let svg, container, zoomed, zoom;

    svg = d3.select(svgElement);
    container = d3.select(containerElement);

    zoomed = () => {

  }

  applyDraggableBehaviour(element, node: Node, graph: ForceDirectedGraph) {

    }


  }


  getForceDirectedGraph(nodes: Node[], links: Link[], options: { width, height }) {
    const sg = new ForceDirectedGraph(nodes, links, options);
    return sg;
  }
}