title: Error in compilation for chart.js Expected method shorthand in object literal ('{label() {...}}'
body: <p>I have tried to customize the label for the tooltip of my chart.js
  by adding a callback for label</p>
  
  <pre><code>this.options = {
          tooltips: {
              callbacks: {
                  label: function(tooltipItem, dataChartTemperature) {
                      return 'reliability=' + dataChartTemperature.datasets[4].data[tooltipItem.index];
                  }
              }
          },
          scales: {
              yAxes: [{
                  id: 'A',
                  type: 'linear',
                  position: 'left',
              }, {
                  id: 'B',
                  type: 'linear',
                  position: 'right',
              }]
          }
  };
  </code></pre>
  
  <p>Compilation result in the following error</p>
  
  <blockquote>
    <p>INFO] ERROR: webapp/app/entities/bc-qualified-hourly-sample-my-suffix/bc-qualified-hourly-sample-my-suffix.component.ts[323, 21]: Expected method shorthand in object literal ('{label() {...}}').</p>
  </blockquote>
  
  <p>I have no idea, how to solve it. If I remove the tooltip callback, the program compiles well.</p>
  
  <p>Any idea?
  Thanks</p>