vue-lazy-hydration/src/utils/hydration-promise.js

Lazy Hydration of Server-Side Rendered Vue.js Components

export function makeHydrationPromise() {
  let hydrate = () => {};
  const hydrationPromise = new Promise((resolve) => {
    hydrate = resolve;
  });

  return {
    hydrate,
    hydrationPromise,
  };
}