I did have another question, I have created the templates I needed using a jsreport-cli project, but I wanted to use jsreport in my existing node.js application. Do I need jsreport or to extend jsreport-core with the recipes and engine i want to use?
edit: Would you prefer I create a new post?

Of course, thanks Jan!

See the following playground here, I have a helper for picking what asset to draw, however jsreport complains about the param spec being wrong.

The first two each statements demonstrate that the helper returns a string as expected and that the assets can be found:

{{#each samples as |sample i|}}
{{getLevelImage sample}}
{{/each}}
{{#each samples as |sample i|}}
<img src="{#asset slyk-alert.svg @encoding=dataURI}" style="height:1.75%; margin: 0 auto;">
{{/each}}

Where the helper getLevelImage is:

handlebars.registerHelper("getLevelImage", function(sample)
{
  switch (sample.Results.Level) {
    case 1:
      return 'slyk-normal.svg @encoding=dataURI';
    case 2:
      return 'slyk-warning.svg @encoding=dataURI';
    case 3:
      return 'slyk-alert.svg @encoding=dataURI';
    case 4:
      return 'slyk-critical.svg @encoding=dataURI';
    default:
      return 'slyk-normal.svg @encoding=dataURI';
  }
});

This results in:

But the final line throws the error.

Found the following workaround

{{lookup (first test) "a"}}
{{lookup (last test) "a"}}

How do I allow the handlebar-helper module in the playground?

I am trying to use the following helpers {{attr colspan=(add samples.length 1)}} while this appears to render correctly as plain text it does not work when on a <td> element. Here is my code snippet:

{{attr colspan=(add samples.length 1)}}
<table class="table table-bordered table-condensed">
    <tr>
        <td {{attr colspan=(add samples.length 1)}} class="sample-info-th text-center">
            <strong>Sample History</strong>
        </td>
        <td class="sample-info-th text-center" colspan="2"></td>
    </tr>
    <tr>
        <td >Sample Date</td>
        {{#each samples as |sample index|}}
        <td > {{date sample._kmd.ect "DD/MM/YYYY"}} </td>
        {{/each}}
    </tr>
    <tr>
      <td>ID</td>
      {{#each samples as |sample index|}}
      <td >{{sample.BottleBarcode}}</td>
      {{/each}}
    </tr>
    <tr>
      <td>SMU</td>
      {{#each samples as |sample index|}}
      <td  >{{sample.SMU}}</td>
      {{/each}}
    </tr>
    <tr>
      <td>Oil Changed</td>
      {{#each samples as |sample index|}}
      <td >{{sample.OilChanged}}</td>
      {{/each}}
    </tr>
    <tr>