Exclude or include dependency optimization?

[bhavers]

Problem:

I kept getting this error in the console:

[vite-plugin-svelte:load] failed to load virtual css module /.../node_modules/svelte-codemirror-editor/dist/CodeMirror.svelte?svelte&type=style&lang.css

in vite.config.ts i had:

optimizeDeps: {
		exclude: [
			'svelte-codemirror-editor',
			'codemirror',
			'@codemirror/lang-javascript',
			'@codemirror/lang-markdown',
			'@codemirror/view',
			'@codemirror/state',
			'@codemirror/language',
			'@codemirror/commands',
			'@codemirror/search',
			'@codemirror/autocomplete',
			'@codemirror/lint'
		]
	}

Eventually the error was solved by moving it from exclude to include, like this:

optimizeDeps: {
		include: [
			'svelte-codemirror-editor',
			'codemirror',
			'@codemirror/lang-javascript',
			'@codemirror/lang-markdown',
			'@codemirror/view',
			'@codemirror/state',
			'@codemirror/language',
			'@codemirror/commands',
			'@codemirror/search',
			'@codemirror/autocomplete',
			'@codemirror/lint',
		]
	}

CodeMirror also seems to work well with using include instead of exclude.

Question:
Is this an error in the documentation (README)?
Or am i setting myself up for some strange error later on?

[SomaticIT]

Hello,

I will look into it. Maybe a change in the way vite optimizes deps.

Can you give me some additional details?

• svelte version
• svelte-kit version
• vite version

Thank you

[bhavers]

Hi, thx, it happens with the latests versions:

• svelte 5.46.0
• svelte-kit 2.49.2
• vite 7.3.0

When i change include to exclude and shift-reload my app the error appears.

[xl0]

Same thing here, all latest versions.