require('mjml') is no longer exporting mjml2html as default method

When importing mjml as a node module the method mjml2html is no longer available as default export. This problem occurs since the 4.2 release.

Steps to reproduce the behavior:

1. Import mjml in a node project using require('mjml')
2. Convert a template String by calling mjml(templateString, cfg)
3. Error message mjml is not a function

Expected behavior The given mjml templateString is converted to html.

MJML environment (please complete the following information):

• Node 10.11, npm 6.4.1
• MJML V4.2.0

The new export for handleMjmlConfig seems to be causing this problem: https://github.com/mjmlio/mjml/blob/master/packages/mjml/src/index.js#L49-L51

A workaround to fix this issue on the user’s side is explicitly importing the default property: require('mjml').default

[Jpunt]

I’m not sure how this is fixed. At least in TypeScript, I cannot do either of these:

import mjml2html from "mjml";
import * as mjml2html from "mjml";

The only way to make this work is:

const mjml2html = require("mjml"); // tslint:disable-line no-var-requires

Which is… undesirable. What is the plan for this?

[iRyusa]

We’ve discussed a bit and it was used in mjml-app, so we might need to check that it works fine with the app first