@sitecore-jss/sitecore-jss-rendering-host/dist/esm/tunnel.js

This module is provided as a part of Sitecore JavaScript Rendering SDK (JSS). It contains the rendering host implementation.

import ngrok from 'ngrok';
/**
 * @param {string} renderHostname
 * @param {Ngrok.Options} options
 */
export function startRenderHostTunnel(renderHostname, options = { port: 80, proto: 'http', quiet: false }) {
    if (!renderHostname) {
        throw new Error('Unable to start render host tunnel as no hostname for the rendering host was specified.');
    }
    const rewriteHost = `${renderHostname}:${options.port}`;
    const finalOptions = Object.assign(Object.assign({}, options), { host_header: 'rewrite', addr: rewriteHost });
    return ngrok.connect(finalOptions).then((url) => {
        if (!options.quiet) {
            console.log(`Tunnel started, forwarding '${url}' to '${rewriteHost}'`);
        }
        return url;
    });
}