Example uses are in the examples folder. This is currently just a barebones script i came up with to help our email team use mjml templates within Salesforce Content Builder.

simple-html example can be run by navigating to its folder via terminal and running:

npm run parse-html

simple-mjml example can be run by navigating to its folder via terminal and running:

npm install
npm run build

Each of the above examples will create an outer-template.html that has content blocks built in using the html comments provided. (example <!-- block email-header--> becomes <custom type="content" name="email-header">). Additionally, the html that exists between two matching content block comments is split into a seperate file to be inserted into the content block or modified further for changing copy/header/etc.

for example, this block of source html:

    <!-- block email-header-->
    <h1>Awesome Email Header</h1>
    <!-- block email-header-->

is rendered like this in the outer-template.html

<custom type="content" name="email-header">

and, triggers the creation of a new file with this content:

<!-- block email-header-->
        <h1>Awesome Email Header</h1>
        <!-- block email-header-->