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lrucache.load cannot read property 'length' of undefined #1

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zwhitchcox opened this issue Mar 30, 2019 · 3 comments
Closed

lrucache.load cannot read property 'length' of undefined #1

zwhitchcox opened this issue Mar 30, 2019 · 3 comments

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@zwhitchcox
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I'm getting the error:

index.js:238 Uncaught TypeError: Cannot read property 'length' of undefined
    at LRUCache.load (index.js:238)
    at loadCache (index.js:27)
    at Module../src/client.js (client.js:17)
    at __webpack_require__ (bootstrap:19)
    at Object.0 (client.js:34108)
    at __webpack_require__ (bootstrap:19)
    at bootstrap:83
    at bootstrap:83

I've basically just followed the instructions here

The relevant server code:

const axios = Axios.create({
  baseURL: 'http://localhost:3000'
})
const cache = new LRU({ max: 500 })
configure({axios, cache})
app.get('*', async (req, res) => {
  const markup = renderToString(
    <StaticRouter location={req.url}>
      <App />
    </StaticRouter>
  )
  const cache = await serializeCache()
  console.log(cache)
  
  res.end(`
  <!DOCTYPE html>
  <head>
    <title>Eggshell</title>
    <link type="text/css" rel="stylesheet" href="main.css">
    <meta name="robots" content="noindex, nofollow">
    <script src="/client.js" defer></script>
    <script>
    window.__AXIOS_HOOKS_CACHE__ = ${cache}
    </script>
  </head>
  <body>
    <div id="app">${markup}</div>
  </body>
  `)
})

The relevant client code:

import './style.css'
import {hydrate} from 'react-dom'
import React from 'react';
import { BrowserRouter as Router, Route, Link } from 'react-router-dom'

import { App } from './app'
import { loadCache, configure } from 'axios-hooks';
import Axios from 'axios'
import LRU from 'lru-cache'

const axios = Axios.create({
  baseURL: 'http://localhost:3000'
})
const cache = new LRU({ max: 500 })
configure({axios, cache})

loadCache(window.__AXIOS_HOOKS_CACHE__)
delete window.__AXIOS_HOOKS_CACHE__

hydrate(
    <Router>
        <App />
    </Router>
    , document.querySelector('#app')
)
@zwhitchcox
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Nevermind, the problem was I forgot to serialize the cache

@zwhitchcox
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This still doesn't render properly on the server side though. The data is loaded, but the app would need to be rerendered with the data loaded in order to do proper server rendering.

@simoneb
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simoneb commented Apr 1, 2019

@zwhitchcox did you check the full example here? it may give some clue as to why it's not working correctly in your setup

@simoneb simoneb closed this as completed Jun 30, 2019
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@simoneb @zwhitchcox