Como puedo agregar nuevas funciones al Handlebars? ya que cuando intento agregar código el template no toma el javascript personalizado

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1

Ejemplo

<script type="text/javascript">

Handlebars.registerHelper('realgiftCards', function(giftCards) {

var _giftCardValue = 0

giftCards.forEach((giftCardValue, giftCardKeys)=>{

_giftCardValue = _giftCardValue + (giftCardValue.value)

})

return (_giftCardValue * -1)

});

</script>

{{#compare paymentData.giftCards.length '>' 1}}

<tr>

<td valign="top" align="right" style="color:#242424;font-size:14px;">

Vale:

</td>

<td valign="top" align="right" style="text-align:left;font-size:14px;">

$ {{formatCurrency (realgiftCards paymentData.giftCards)}}

</td>

</tr>

{{/compare}}