@roxi/routify/lib/extra/vite-plugin/assets/cjs/worker.js

/**
 * This file handles SSR rendering of pages.
 * It can be imported:
 * @example
 * import { render } from 'path/to/render.js`
 * const html = await render('/post/welcome')
 *
 * Or used as a CLI:
 * @example
 * node serve.js render /post/welcome
 */

const { readFileSync } = require('fs')
const { render: _render } = require('./render.js')
const { URL } = require('url')
const { parentPort, workerData, isMainThread } = require('worker_threads')

const template = readFileSync(new URL('./index.html', import.meta.url), 'utf-8')

/**
 * Renders a given path to HTML
 * @param {string} path
 * @returns {Promise<{
 *   html: string,
 *   status: number,
 *   css: { code: string, map: string },
 *   head: '',
 *   error: string,
 *   maxage: number,
 *   props: Object.<string, string>,
 *   redirect: string
 * }>}
 */
export const render = async (path = '/') => {
    const output = await _render(path)

    if (!template.includes('<!--ssr:html-->'))
        console.error('index.html is missing <!--ssr:html-->')

    const html = template
        .replace('<!--ssr:html-->', output.html)
        .replace('<!--ssr:head-->', output.head)
        .replace('<!--ssr:css-->', '<style>' + (output.css?.code || '') + '</style>')
    return { ...output, html }
}

/**
 * Allows render to be called from worker. *
 */
if (!isMainThread && parentPort && 'url' in workerData) {
    render(workerData.url)
        .then(result => {
            parentPort?.postMessage(result)
        })
        .catch(err => {
            parentPort?.postMessage({ error: err.message })
        })
}