SSR with J2V8

getHtml.kt

fun getHtml(componentPath: String, modelJson: String, currentUrl: String): String {
    val nodeJS = NodeJS.createNodeJS()

    nodeJS.runtime.add("componentPath", componentPath)
    nodeJS.runtime.add("modelJson", modelJson)
    nodeJS.runtime.add("currentUrl", currentUrl)

    try {
      val vendors = nodeJS.require(File(bundleLocation, "vendor.js"))
      val mainModule = nodeJS.require(File(bundleLocation, "pages.js"))
      val exports = nodeJS.require(File(bundleLocation, "renderer.js"))
      while (nodeJS.isRunning) {
        nodeJS.handleMessage()
      }

      val fb = exports.get("FuseBox") as V8Function
      val import = fb.get("import") as V8Function
      val args = V8Array(nodeJS.runtime)
      args.push("default/core/renderer.js")
      val html = import.call(null, args) as String

      vendors.release()
      mainModule.release()
      fb.release()
      import.release()
      args.release()
      exports.release()
      nodeJS.release()
      return html
    } catch (e: V8ScriptExecutionException) {
      e.printStackTrace()
      return ""
    }
  }

renderer.ts

const React = require("react");
const ReactServer = require("react-dom/server");

const loaded = FuseBox.import(componentPath);
if (!loaded) {
  throw new Error(`Could not find component ${componentPath}`)
}

const Component = loaded.default;
const model = JSON.parse(modelJson);
global.currentUrl = currentUrl;

const Root = React.createElement(Component, {model});
let html = ReactServer.renderToString(Root);
module.exports = html;