TypeError: The "from" argument must be of type string. Received undefined with Docusaurus >=3.6.0

[chris48s]

This is a new error with Docusaurus 3.6.x
You can reproduce fairly easily.

npx create-docusaurus-openapi my-website
cd my-website
npm start

will throw it.

I think that fundamentally this is happening because siteDir is not set in

docusaurus-openapi/packages/docusaurus-plugin-openapi/src/index.ts

Lines 273 to 290 in aafdc8a

	options: {
	admonitions: options.admonitions,
	remarkPlugins,
	rehypePlugins,
	beforeDefaultRehypePlugins,
	beforeDefaultRemarkPlugins,
	markdownConfig: siteConfig.markdown ?? { mdx1Compat: {} },
	metadataPath: (mdxPath: string) => {
	if (mdxPath.startsWith(dataDir)) {
	// The MDX file already lives in `dataDir`: this is an OpenAPI MDX
	return mdxPath.replace(/(-content\.mdx?)$/, ".json");
	} else {
	// Standard resolution
	const aliasedSource = aliasedSitePath(mdxPath, siteDir);
	return join(dataDir, `${docuHash(aliasedSource)}.json`);
	}
	},
	},

Maybe the fix is as simple as setting siteDir to a value like . in there? I haven't dug any further than that.

[chris48s]

Could be related to https://docusaurus.io/blog/releases/3.6#plugins