chartjs-plugin-annotations not displayed in angular 5

Question

While using the chart.js and the plugin chartjs-plugin-annotation, annotations are not showing while using angular 5, no error messages are displayed.

I have created

Answer 1

As an adition of what Ade said. You can also add the plugin this way

import { ChartOptions } from 'chart.js';
import * as ChartAnnotation from 'chartjs-plugin-annotation';

this.chart = new Chart('canvas', {
  ...
  options: {
    ...
    annotation: { ... }
  } as ChartOptions,
  plugins: [ChartAnnotation]
});

Adding the {...} as ChartOptions makes that TypeScript doesn't complain