Repro: vite 8.3.0 + rolldown 1.2.9 — every dynamic import fails under experimental.bundledDev with __rolldown_runtime__.requestLazy is not a function

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vite 8.3.0 + rolldown 1.2.9: every dynamic import fails under `experimental.bundledDev`

Gists are flat, so the file layout is encoded in the names below. Recreate it as:

package.json
vite.config.js
index.html
src/data.json     <- src__data.json
src/mod.js        <- src__mod.js
src/main.js       <- src__main.js

Then:

npm install
npm run dev

The page shows:

json: FAILED __rolldown_runtime__.requestLazy is not a function | js: FAILED __rolldown_runtime__.requestLazy is not a function

Remove experimental.bundledDev from vite.config.js and both load fine. Add "overrides": { "rolldown": "1.2.6" } to package.json, reinstall, and both load fine with bundledDev still on.

	<!doctype html>
	<html>

	loading…

	</body>
	</html>

	{
	"name": "vite8-bundled-dev-dynamic-import",
	"private": true,
	"type": "module",
	"scripts": { "dev": "vite" },
	"devDependencies": { "vite": "8.3.0" }
	}

{ "hello": "world" }

	const out = document.getElementById('out');
	const lines = [];

	for (const [label, load] of [
	['json', () => import('./data.json')],
	['js', () => import('./mod.js')],
	]) {
	try {
	const mod = await load();
	lines.push(`${label}: ok ${JSON.stringify(mod.default ?? mod.value ?? mod)}`);
	} catch (error) {
	lines.push(`${label}: FAILED ${error.message}`);
	}
	}

	out.textContent = lines.join(' \| ');

export const value = 'from a js module';

	import { defineConfig } from 'vite';

	export default defineConfig({
	experimental: { bundledDev: true },
	});

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Repro: vite 8.3.0 + rolldown 1.2.9 — every dynamic import fails under experimental.bundledDev with __rolldown_runtime__.requestLazy is not a function

vite 8.3.0 + rolldown 1.2.9: every dynamic import fails under experimental.bundledDev

vite 8.3.0 + rolldown 1.2.9: every dynamic import fails under `experimental.bundledDev`