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PouchDB and SvelteKit

I want to use PouchDB with SvelteKit. I have copied pouchdb-7.2.1.js to /src/libd in SvelteKit and renamed it to pouchdb.js. Pouchdb should run in the browser. Therefore I have used ssr=false to suppress server side rendering. I get the first error at the import statement. This is my first very short page (couchdb.svelte):

<script context="module">
    export const ssr = false;
</script>

<script>
    import PouchDB from '$lib/pouchdb.js'; 
</script>

I get an error 500

import not found: PouchDB

I have tried a lot of diffent version without any success. For example:

import PouchDB from 'pouchdb-browser';  (After npm i pouchdb-browser)
import PouchDB from 'pouchdb';          (After npm i pouchdb)

What is the correct way to use pouchdb?

like image 558
Martin Weissenboeck Avatar asked Oct 21 '25 00:10

Martin Weissenboeck


2 Answers

Here is a work-around that uses PouchDB via a script tag:

index.svelte:

<script>
    import { onMount } from 'svelte'

    // Ensure execution only on the browser, after the pouchdb script has loaded.
    onMount(async function() {
        var db = new PouchDB('my_database');
        console.log({PouchDB})
        console.log({db})
    });
</script>


<svelte:head>
    <script src="//cdn.jsdelivr.net/npm/[email protected]/dist/pouchdb.min.js"></script>
</svelte:head>

When imported, PouchDB seems to expect a certain environment that Svelte/Vite/Rollup does not provide. (Svelte/Vite is happiest with proper ESM modules; PouchDB seems to be a "window.global" script that was converted to a JS module.)

There may be a way to modify the configuration to create the environment expected by PouchDB. I think you would have to modify the svelte.config.cjs file. (Specifically the vite section that determines the rollup configuration.)

You might find some hints in this related issue for PouchDB + Angular.

I would just use the <script> work-around above.

like image 104
Leftium Avatar answered Oct 22 '25 15:10

Leftium


For future googlers trying to integrate pouchdb-browser and/or RxDB with sveltekit here are the changes to "fix" the enviornment for pouchdb in the browser when using vite.

  1. Add to your <head> section before %svelte.head%
<script>
    window.process = window.process || {env: {NODE_DEBUG:undefined, DEBUG:undefined}};
    window.global = window;
</script>
  1. In svelte.config.js add the optimizeDeps to config.kit.vite.optimizeDeps
optimizeDeps: {
    allowNodeBuiltins: ['pouchdb-browser', 'pouchdb-utils', 'base64id', 'mime-types']
}

Here is a commit that makes these changes to my app: https://github.com/TechplexEngineer/bionic-scouting/commit/d1c4a4dcdc7096ae40937501d97a7ef9ee10ab66

Thanks to: pouchdb/pouchdb#8266 (comment)

like image 30
TechplexEngineer Avatar answered Oct 22 '25 16:10

TechplexEngineer



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