Meteor - Blaze asynchronous helper handling

 {{#let data = (helper_name 'value1' 'value2')}}

    {{#if @pending 'data'}}

        Loading message here... 

    {{/if}}

    {{#if @rejected 'data'}}

        Error message here... 

    {{/if}}

    {{#if @resolved 'data'}}

        Your data-dependent content here...

    {{/if}}

{{/let}}