Sveltekit + D3 + Netlify

This repo shows a solution when using Sveltkit with D3 on Netlify. I could run everything locally without problems, but would get this message when deployed on Netlify.

500

Must use import to load ES Module: /var/task/node_modules/d3-scale/src/index.js
require() of ES modules is not supported.
require() of /var/task/node_modules/d3-scale/src/index.js from /var/task/.netlify/server/entries/pages/index.svelte.js is an ES module file as it is a .js file whose nearest parent package.json contains "type": "module" which defines all .js files in that package scope as ES modules.
Instead rename index.js to end in .cjs, change the requiring code to use import(), or remove "type": "module" from /var/task/node_modules/d3-scale/package.json.

Error [ERR_REQUIRE_ESM]: Must use import to load ES Module: /var/task/node_modules/d3-scale/src/index.js
require() of ES modules is not supported.
require() of /var/task/node_modules/d3-scale/src/index.js from /var/task/.netlify/server/entries/pages/index.svelte.js is an ES module file as it is a .js file whose nearest parent package.json contains "type": "module" which defines all .js files in that package scope as ES modules.
Instead rename index.js to end in .cjs, change the requiring code to use import(), or remove "type": "module" from /var/task/node_modules/d3-scale/package.json.

What helped me, was to set the version of Node to v16.15.1 in .node-version and add the following lines to netlify.toml:

[functions]
  node_bundler = "esbuild"

See the deployed version running here: https://papaya-stroopwafel-14b612.netlify.app/

More information here, here and here. Older information are here and here.