I ran into an error when deploying a SvelteKit app:

require() of ES Module /var/task/node_modules/p-memoize/dist/index.js from /var/task/.netlify/server/entries/endpoints/wiki/_...slug_.ts.js not supported.
Instead change the require of index.js in /var/task/.netlify/server/entries/endpoints/wiki/_...slug_.ts.js to a dynamic import() which is available in all CommonJS modules.

This error happens because the dependency in question, p-memoize is a pure-ESM package in a SvelteKit app. This causes a runtime error in the SSR bundle.

To solve this, add it to vite.config.js:

import { sveltekit } from '@sveltejs/kit/vite'

/** @type {import('vite').UserConfig} */
const config = {
  plugins: [sveltekit()],
  ssr: {
    noExternal: ['p-memoize'],
  },
}

export default config