mjml: v4.10.0 is breaking our app

Describe the bug

Our build starts to fail while updating mjml to v4.10.0

To Reproduce

Upgrade to v4.10.0 from v4.9.3

Expected behavior

Our builds still pass, and emails are rendered 👍

MJML environment (please complete the following information):

• OS: Ubuntu 20.04
• MJML Version 4.10.0
• MJML tool used [e.g MJML App]: The MJML API

Additional context

/builds/stordata/cmdb/node_modules/mjml-core/lib/index.js:66
var _classCallCheck2 = _interopRequireDefault(require("@babel/runtime/helpers/classCallCheck"));
                       ^
TypeError: _interopRequireDefault is not a function
    at Object.<anonymous> (/builds/stordata/cmdb/node_modules/mjml-core/lib/index.js:66:24)
    at Module._compile (internal/modules/cjs/loader.js:1063:30)
    at Module.replacementCompile (/builds/stordata/cmdb/node_modules/append-transform/index.js:60:13)
    at Module._extensions..js (internal/modules/cjs/loader.js:1092:10)
    at Object.<anonymous> (/builds/stordata/cmdb/node_modules/append-transform/index.js:64:4)
    at Module.load (internal/modules/cjs/loader.js:928:32)
    at Function.Module._load (internal/modules/cjs/loader.js:769:14)
    at Module.require (internal/modules/cjs/loader.js:952:19)
    at require (internal/modules/cjs/helpers.js:88:18)
    at Object.<anonymous> (/builds/stordata/cmdb/node_modules/mjml/lib/index.js:12:41)
    at Module._compile (internal/modules/cjs/loader.js:1063:30)
    at Module.replacementCompile (/builds/stordata/cmdb/node_modules/append-transform/index.js:60:13)
    at Module._extensions..js (internal/modules/cjs/loader.js:1092:10)
    at Object.<anonymous> (/builds/stordata/cmdb/node_modules/append-transform/index.js:64:4)
    at Module.load (internal/modules/cjs/loader.js:928:32)
    at Function.Module._load (internal/modules/cjs/loader.js:769:14)
    at Module.require (internal/modules/cjs/loader.js:952:19)
    at require (internal/modules/cjs/helpers.js:88:18)
    at Object.<anonymous> (/builds/stordata/cmdb/backend/mailer.js:2:390)
    at Module._compile (internal/modules/cjs/loader.js:1063:30)
    at Module.replacementCompile (/builds/stordata/cmdb/node_modules/append-transform/index.js:60:13)
    at Module._extensions..js (internal/modules/cjs/loader.js:1092:10)

Looking at https://app.renovatebot.com/package-diff?name=mjml&from=4.9.3&to=4.10.0 I can see this

I suppose that’s not what you want 😃