Function hydrate

packages/runtime-core/src/hydration.ts:119–135

(vnode, container)

  } = rendererInternals

  const hydrate: RootHydrateFunction = (vnode, container) => {
    if (!container.hasChildNodes()) {
      ;(__DEV__ || __FEATURE_PROD_HYDRATION_MISMATCH_DETAILS__) &&
        warn(
          `Attempting to hydrate existing markup but container is empty. ` +
            `Performing full mount instead.`,
        )
      patch(null, vnode, container)
      flushPostFlushCbs()
      container._vnode = vnode
      return
    }

    hydrateNode(container.firstChild!, vnode, null, null, null)
    flushPostFlushCbs()
    container._vnode = vnode
  }

  const hydrateNode = (
    node: Node,