Support for literals from Shopify liquid

[danielfriis]

Hi,

Thanks for making this available!

Do you have any plans to support LITERALS from the Shopify liquid project?

I use blank quite extensively to enable conditional renders of certain sections in a template. It seems to be a foundational part of the Shopify liquid project: https://help.shopify.com/en/themes/liquid/basics/true-and-false#truthy

Something like this:

{% unless settings.fp_heading == blank %}
    <h1>{{ settings.fp_heading }}</h1>
{% endunless %}

Thanks!

[scottge]

I need this feature too. :)

[harttle]

Currently I'm shipping Liquid to TypeScript and get it strictly typed, I'll provide this feature ASAP after that.

[scottge]

This is amazing. Thank you for the work!!!

Question: I see you add the drop abstract class and interface in this commit too. Does it mean that for my own custom drops I should start to extend your drop base class and implement your IDrop interface? Would you mind adding a custom drop unit test so that I can follow your example.