Constructing mime image attachment

[Joseph L. Casale]

I have some json encoded input for nodemailer (https://nodemailer.com/message/embedded-images)
where the path key is a string value which contains the base64 encoded data such as:

{
    html: 'Embedded image: <img src="cid:unique at nodemailer.com"/>',
    attachments: [{
        filename: 'image.png',
        path: 'data:image/png;base64,iVBORw....',
        cid: 'unique at nodemailer.com'
    }]
}

Does an approach exist to construct a MIMEImage object with the existing
base64 string without parsing it and decoding it?

Thanks,
jlc