A utility for angular universal to pass server rendered DOM into the bootstrapped client app based on this gist from @gdi2290.
###Use cases:
ads - if an ad bootstraps into server rendered DOM before bootstrap, the ad markup can be passed into the same position as the client app.
edge compute transformed markup - DOM that has been processed after server render can be preserved in its transformed state and passed into client app.
static content - selectively reduce CPU and RAM in browser for components that have already been processed server side by passing the server rendered DOM through as-is.
###How to use:
Create a server version of your component and a browser version of your component and add universalPassthrough or universal-passthrough directive to your components.
The server version of your component will be the version that carries over into the client app.
Make sure your client version of the component has the same width, height and background-color as the server component to prevent FOUC when transitioning DOM state.
The example uses the package.json browser spec pattern for splitting server and browser modules, components and services.
In client.ts, add the passthrough function to transfer DOM state.
import { platformUniversalDynamic } from 'angular2-universal';
import { passthrough } from 'universal-passthrough';
import { MainModule } from './app.browser.module';
const platformRef = platformUniversalDynamic();
let serverEls = passthrough().getServerElements();
platformRef.bootstrapModule(MainModule)
.then((mainModuleRef) => {
passthrough().complete(mainModuleRef, serverEls);
return mainModuleRef;
});