gatsby/cache-dir/react-dom-utils.js

Blazing fast modern site generator for React

const map = new WeakMap()

export function reactDOMUtils() {
  const reactDomClient = require(`react-dom/client`)

  const render = (Component, el) => {
    let root = map.get(el)
    if (!root) {
      map.set(el, (root = reactDomClient.createRoot(el)))
    }
    root.render(Component)
  }

  const hydrate = (Component, el) => reactDomClient.hydrateRoot(el, Component)

  return { render, hydrate }
}