The `mergeTags` feature doesn't work anymore

[haZya]

Bug report

Describe the bug

mergeTags feature doesn't work anymore after the update that changes the template literal to mustache. It may be related to #133. Currently all the mergeTags are rendered empty in the emails. The variables are replaced correctly in the editor, however, once the email is sent, it is empty. This only happens to the variables declared in the mergeTags in the plugin options and not the ones that are passed to the .sendTemplatedEmail() function.

Steps to reproduce the behavior

Declare some mergeTags in the plugin options**

module.exports = ({ env }) => ({
  // ...
   "email-designer": {
    config: {
      editor: {
        options: {
          mergeTags: [
            {
              name: "Value1",
              value: "{{ VALUE1 }}",
              sample: "VALUE1",
            },
          ],
        },
      },
    },
  },
  // ...
});

Expected behavior

Correctly display the values from mergeTags.

Screenshots

Correctly parsed in the editor.

Empty in the actual email received.

System

• Node.js version: 20.9.0
• NPM version: 10.1.0
• Strapi version: 4.24.2
• Plugin version: 2.2.1
• Database: Postgres
• Operating system: Windows 11