Source code of SendGrid handlebars helpers

[yeysman]

Hello team,
I would like to know if the source code of handlebars helpers used by SendGrid templates is publicly available.
I have integration with SG and would like to have a template preview with the actual data of my system.
Currently, I did my implementation of helpers like Equals, notEquals, but to make the preview to be the same it is better to have the same helper implementation that SG has.

Could you please advise me on this matter?

[bniksa]

Would also like access to the handlebar helpers, in order to run and preview locally.

Any updates on this?