Named export 'render' not found

[steveninety]

Problem

import { render } from "dom-serializer"

The dom-serializer package specifies export default render, so importing { render } does not work.

Occurs where
Error on build in a SvelteKit / Vite / ESM project.

Imported in:
packages/base/src/generic-formatters.js

Error message

import { render } from "dom-serializer";
^^^^^^
SyntaxError: Named export 'render' not found. The requested module 'dom-serializer' is a CommonJS module, which may not support all module.exports as named exports.
CommonJS modules can always be imported via the default export, for example using:

import pkg from 'dom-serializer';
const { render } = pkg;

Fix

import render from "dom-serializer"

Will open a pull request.

[KillyMXI]

Hmm.
dom-serializer exports render both as named function and default:

exports.render = render;
exports.default = render;

export function render ...
export default render;

Why SvelteKit / Vite can't understand it?

[KillyMXI]

The requested module 'dom-serializer' is a CommonJS module

Why?
Both html-to-text version 9 and dom-serializer provide both CJS and ESM versions.

[steveninety]

Yes it's strange. Will patch it for now, but need to look into it further.

[KillyMXI]

My main guess:
Whatever web bundler is used underneath - is not capable enough and falls back to CommonJS for entire dependency subtree once it sees a single CJS package. (There were related issues with Webpack before.)

Proper solutions could be:

• use a smarter bundler or improve the one that is used;
• replace or improve remaining CJS-only packages.

In case of html-to-text, there is one remaining - deepmerge.
deepmerge situation is not great. I should've just written my own package when I had time, as I did with many other things.
There are now

• a "galaxy brain" alternative, or simply too different to figure out whether I can achieve the same behavior I need;
• an updated fork that I'm not sure whether I can trust;
• an idea of more ergonomic package I'm still bearing.

I will choose something when I'm able to resume working on next major version.