@greenwood/plugin-renderer-lit
v0.30.2
Published
A server-side rendering plugin for Lit based Greenwood projects.
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@greenwood/plugin-renderer-lit
Overview
A Greenwood plugin for using Lit's SSR capabilities as a custom server-side renderer instead of Greenwood's default renderer (WCC). This plugin also gives the ability to statically render entire pages and layouts to output completely static sites. For more information and complete docs on Greenwood, please visit our website.
This package assumes you already have
@greenwood/cli
installed.
Prerequisite
This packages depends on the Lit package as a peerDependency
. This means you must have Lit already installed in your project. You can install anything following the 3.x
release line.
# npm
$ npm -i lit
# yarn
$ yarn add lit
# pnpm
$ pnpm add lit
Installation
You can use your favorite JavaScript package manager to install this package.
# npm
$ npm i -D @greenwood/plugin-renderer-lit
# yarn
$ yarn add @greenwood/plugin-renderer-lit --dev
# pnpm
$ pnpm add -D @greenwood/plugin-renderer-lit
Caveats
- Please familiarize yourself with some of the caveats called out in the Lit docs, like:
- Lit SSR only renders into declarative shadow roots, so you will have to keep browser support and polyfill usage in mind.
- At this time,
LitElement
does not supportasync
work. You can follow along with this issue in the Lit repo.
- Lit only supports templates on the server side for HTML generated content, thus Greenwood's
getBody
API must be used. We would love for server only components to be a thing though! - Lit does not support
CSSStyleSheet
(aka CSS Modules) in their SSR DOM shim. - Full hydration support is not available yet. See this Greenwood issue to follow along with when it will land.
See this repo for a full demo of isomorphic Lit SSR with SSR pages and API routes deployed to Vercel serverless functions.
Usage
Add this plugin to your greenwood.config.js:
import { greenwoodPluginRendererLit } from '@greenwood/plugin-renderer-lit';
export default {
// ...
plugins: [
greenwoodPluginRendererLit()
]
}
Now, you can author SSR pages using Lit templates and components using Greenwood's getBody
API. The below is an example of generating a template of LitElement based <app-card>
web components.
// src/pages/products.js
import { html } from 'lit';
import '../components/card.js';
export async function getBody() {
const products = await getProducts();
return html`
${
products.map((product, idx) => {
const { title, thumbnail } = product;
return html`
<app-card
title="${idx + 1}) ${title}"
thumbnail="${thumbnail}"
></app-card>
`;
})
}
`;
}
Options
Isolation Mode
By default, this plugin sets isolation
mode to true
for all SSR pages. If you want to override this, just export an isolation
const.
// src/pages/products.js
export const isolation = false;
See the isolation configuration docs for more information.
Hydration
In order for server-rendered components to become interactive on the client side, Lit's client-side hydration script must be included on the page. This setting is true
by default, but if you want to turn it off, you can export
the hydration option from your page with a value of false
.
// src/pages/products.js
export const hydration = false; // disable Lit hydration scripts for this page
Prerender
The plugin provides a setting that can be used to override Greenwood's default prerender implementation which uses WCC, to use Lit instead.
import { greenwoodPluginRendererLit } from '@greenwood/plugin-renderer-lit';
export default {
// ...
plugins: [
greenwoodPluginRendererLit({
prerender: true
})
]
}
Keep in mind you will need to make sure your Lit Web Components are isomorphic and properly leveraging
LitElement
's lifecycles and browser / Node APIs accordingly for maximum compatibility and portability.