Question 121772 in Redis Question posted in
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TypeError: Class extends value undefined is not a constructor or null (svelte redis)

I just got started with svelte and was trying to make an app with redis as the db. I made a typescript file with all the db functions I would need and tried to import it into my svelte components, but when I did that I got the following error

Class extends value undefined is not a constructor or null
TypeError: Class extends value undefined is not a constructor or null
    at node_modules/@node-redis/client/dist/lib/client/socket.js (http://localhost:3000/node_modules/.vite/chunk-L35TFNQI.js?v=60c87e0f:6515:46)
    at __require (http://localhost:3000/node_modules/.vite/chunk-VP3FZ6LR.js?v=60c87e0f:25:44)
    at node_modules/@node-redis/client/dist/lib/client/index.js (http://localhost:3000/node_modules/.vite/chunk-L35TFNQI.js?v=60c87e0f:9192:20)
    at __require (http://localhost:3000/node_modules/.vite/chunk-VP3FZ6LR.js?v=60c87e0f:25:44)
    at node_modules/@node-redis/client/dist/index.js (http://localhost:3000/node_modules/.vite/redis.js?v=60c87e0f:852:20)
    at __require (http://localhost:3000/node_modules/.vite/chunk-VP3FZ6LR.js?v=60c87e0f:25:44)
    at node_modules/redis/dist/index.js (http://localhost:3000/node_modules/.vite/redis.js?v=60c87e0f:2589:20)
    at __require (http://localhost:3000/node_modules/.vite/chunk-VP3FZ6LR.js?v=60c87e0f:25:44)
    at http://localhost:3000/node_modules/.vite/redis.js?v=60c87e0f:2615:21

This is my redis file (even with only this much, I get the same error)

import redis from 'redis'

export var str = "sample string"

This is my svelte component’s script

<script lang="ts">
    import { str } from "../redis_test";
</script>
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2

Answers


  1. 0

    Normally, because the redis – npm package is designed for Node.js, I would say to follow How to use npm modules in browser? and use browserify so that it’s able to run in the browser.

    After reading Can I connect directly to a Redis server from JavaScript running in a browser?, I would say that you need a server-side setup to connect to your redis server and then you can query your server-side as you need.

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  2. 0

    I’ve had a similar problem and my understanding from reading the above is that it caused because the browser client is trying to read the db which is on the server.
    I am also using sveltekit and I resolved by problem by making sure my code was in an endpoint, which only runs on the server and then invoked the endpoint to get my data.

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