buuh/bench/render.js

// Rendering benchmarks: @uhhm/buuh-html vs nanohtml v1 vs µhtml.
//
//   npm run bench
//
// Two environments:
// - server: pure string rendering in Node (no DOM at all)
// - browser-path: DOM construction in happy-dom. Caveat: happy-dom is a
//   JS DOM, so absolute numbers are not real-browser numbers — but all
//   contenders pay the same DOM tax, so the relative ordering is
//   indicative of template-engine overhead.
//
// Scenarios: "create" builds a fresh 100-row table per iteration;
// "update" re-renders the same live tree with new data each iteration
// (choo-style engines build fresh + morph, µhtml updates holes in place).

import { createRequire } from 'node:module'
const require = createRequire(import.meta.url)

const ROWS = 100
const DURATION_MS = 500
const WARMUP_MS = 100

function data (tick) {
  const rows = new Array(ROWS)
  for (let i = 0; i < ROWS; i++) {
    rows[i] = { id: i, label: 'row ' + i + ' rev ' + tick, selected: i === tick % ROWS }
  }
  return rows
}

function bench (name, fn) {
  let t = performance.now()
  const warmupEnd = t + WARMUP_MS
  let tick = 0
  while (performance.now() < warmupEnd) fn(tick++)

  let ops = 0
  const start = performance.now()
  const end = start + DURATION_MS
  while (performance.now() < end) {
    fn(tick++)
    ops++
  }
  const elapsed = performance.now() - start
  const opsSec = Math.round((ops / elapsed) * 1000)
  console.log('  ' + name.padEnd(34) + String(opsSec).padStart(8) + ' ops/s')
  return opsSec
}

// ---------- server (string) rendering ----------

console.log('\nserver rendering — %d-row table to string:', ROWS)
{
  const { default: ourHtml } = await import('@uhhm/buuh-html/server')
  const nano = require('nanohtml') // main entry is the server renderer

  const table = (html, rows) => html`<table><tbody>${rows.map((r) => html`<tr class=${r.selected ? 'selected' : ''}><td>${r.id}</td><td>${r.label}</td></tr>`)}</tbody></table>`

  bench('@uhhm/buuh-html (server)', (t) => String(table(ourHtml, data(t))))
  bench('nanohtml v1 (server)', (t) => String(table(nano, data(t))))
}

// ---------- browser-path rendering (happy-dom) ----------

const { Window } = await import('happy-dom')
const win = new Window()
globalThis.window = win
globalThis.document = win.document
// µhtml touches DOM constructors as ambient globals at import time
for (const name of [
  'DocumentFragment', 'HTMLElement', 'SVGElement', 'Element', 'Node',
  'Text', 'Comment', 'Range', 'MutationObserver', 'customElements',
  'requestAnimationFrame', 'cancelAnimationFrame'
]) {
  if (!(name in globalThis) && name in win) globalThis[name] = win[name]
}

const { default: ourBrowserHtml } = await import('@uhhm/buuh-html/browser')
const { default: morph } = await import('@uhhm/buuh-html/morph')
const nanoBrowser = require('nanohtml/lib/browser.js')
const { html: uhtml, render: urender } = await import('uhtml')

const table = (html, rows) => html`<table><tbody>${rows.map((r) => html`<tr class=${r.selected ? 'selected' : ''}><td>${r.id}</td><td>${r.label}</td></tr>`)}</tbody></table>`

console.log('\nbrowser-path create — fresh %d-row table per iteration (happy-dom):', ROWS)
bench('@uhhm/buuh-html (cached templates)', (t) => table(ourBrowserHtml, data(t)))
bench('nanohtml v1 (hyperx runtime)', (t) => table(nanoBrowser, data(t)))
bench('uhtml v5 (fresh container)', (t) => {
  const c = document.createElement('div')
  urender(c, uhtml`<table><tbody>${data(t).map((r) => uhtml`<tr class=${r.selected ? 'selected' : ''}><td>${r.id}</td><td>${r.label}</td></tr>`)}</tbody></table>`)
})

console.log('\nbrowser-path update — re-render same live tree (happy-dom):')
{
  const live = table(ourBrowserHtml, data(0))
  document.body.appendChild(live)
  bench('@uhhm/buuh-html + nanomorph', (t) => morph(live, table(ourBrowserHtml, data(t))))
  document.body.removeChild(live)
}
{
  const live = table(nanoBrowser, data(0))
  document.body.appendChild(live)
  bench('nanohtml v1 + nanomorph', (t) => morph(live, table(nanoBrowser, data(t))))
  document.body.removeChild(live)
}
{
  const c = document.createElement('div')
  document.body.appendChild(c)
  const view = (t) => uhtml`<table><tbody>${data(t).map((r) => uhtml`<tr class=${r.selected ? 'selected' : ''}><td>${r.id}</td><td>${r.label}</td></tr>`)}</tbody></table>`
  bench('uhtml v5 (keyed holes, in place)', (t) => urender(c, view(t)))
  document.body.removeChild(c)
}

console.log('\ncaveat: happy-dom numbers are indicative (same DOM tax for all), not real-browser numbers.\n')