I have been using angular5 and have install the highchart using npm install.
Now I am able to use all the chart using the same except the sankey charts.
It gives me hightchart error 17.
Please help.
In your app.module.ts file add these three lines it will will work.
import { Component } from '@angular/core';
import * as Highcharts from 'highcharts';
import * as highchartsSankey from 'highcharts/modules/sankey';
highchartsSankey(Highcharts);