html-requirer 
Allows you to require html into your js as a string for use in templates. Uses readFileSync under the hood, so works best in situations performance is not so important. i.e. build scripts.
Install
npm install html-requirer
Usage
const requireHtml = ;const header = ; const html = ` <!doctype html> <html lang="en"> <head> <meta charset="utf-8"> </head> <body> <section> <p>other stuff</p> </section> </body> </html>`;