serial-render.js

// nuxt module
// serialize server side rendering to prevent singleton problem like https://github.com/vuex-orm/vuex-orm/issues/514

let seq = 1
let lockPromise
const auxData = new WeakMap()

const lock = async (data) => {
  while (lockPromise) {
    console.log('serial-render waiting')
    await lockPromise
  }
  lockPromise = new Promise((resolve) => {
    data.lockPromiseResolve = resolve
  })
}

const unlock = (data) => {
  if (data.lockPromiseResolve) {
    lockPromise = void 0
    const resolve = data.lockPromiseResolve
    data.lockPromiseResolve = void 0
    resolve()
  }
}

export default function () {
  this.nuxt.hook('vue-renderer:ssr:prepareContext', async ({ req }) => {
    const data = { id: seq++ }
    auxData.set(req, data)
    await lock(data)
    console.log('serial-render start ' + data.id)
  })

  this.nuxt.hook('vue-renderer:ssr:context', async ({ req }) => {
    const data = auxData.get(req)
    console.log('serial-render finished ' + data.id)
    unlock(data)
  })

  this.nuxt.hook('render:errorMiddleware', async (connectInstance) => {
    connectInstance.use((err, req, res, next) => {
      const data = auxData.get(req)
      if (data) {
        console.log('serial-render error ' + data.id)
        unlock(data)
      }
      next(err)
    })
  })
}

Another solution of vuex-orm/vuex-orm#514