From d5ce2d6c144ee8f079b08052c87352466843fd8c Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Gautier=20Ben=20A=C3=AFm?=
 <48261497+GauBen@users.noreply.github.com>
Date: Tue, 14 Jan 2025 23:43:58 +0100
Subject: [PATCH] fix: pre-optimize clsx

---
 packages/vite-plugin-svelte/src/utils/options.js | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/packages/vite-plugin-svelte/src/utils/options.js b/packages/vite-plugin-svelte/src/utils/options.js
index 6582e6e7e..7c879acd7 100644
--- a/packages/vite-plugin-svelte/src/utils/options.js
+++ b/packages/vite-plugin-svelte/src/utils/options.js
@@ -563,6 +563,10 @@ function buildExtraConfigForSvelte(config) {
 			'config'
 		);
 	}
+	// clsx may be imported by svelte runtime, make vite optimize it ahead of time
+	if (!isDepExcluded('clsx', config.optimizeDeps?.exclude ?? [])) {
+		include.push('clsx');
+	}
 	/** @type {(string | RegExp)[]} */
 	const noExternal = [];
 	/** @type {string[]} */