You can copy the yaml-code below and use it as frontmatter for an example page.
You can paste this URL into GitHub Issues to share your setup when filing bugs or questions
Handlebars:
Template
{{#if (isdefined value1)}}true{{else}}false{{/if}}
{{#if (isdefined value2)}}true{{else}}false{{/if}}
Preparation-Script
Handlebars.registerHelper('isdefined', function (value) {
return value !== undefined;
});
Input
{ value1: {} }
Output
true
false