From 533b184c7ab183b6e9900640c668871f7b41746b Mon Sep 17 00:00:00 2001
From: Jonas Geiler <git@jonasgeiler.com>
Date: Tue, 28 Apr 2026 22:32:23 +0200
Subject: [PATCH] feat(sv): improve `vitest` v3 detection

---
 .changeset/tangy-pears-unite.md        |  5 +++++
 packages/sv/src/addons/vitest-addon.ts | 10 +++++-----
 2 files changed, 10 insertions(+), 5 deletions(-)
 create mode 100644 .changeset/tangy-pears-unite.md

diff --git a/.changeset/tangy-pears-unite.md b/.changeset/tangy-pears-unite.md
new file mode 100644
index 000000000..d0104035d
--- /dev/null
+++ b/.changeset/tangy-pears-unite.md
@@ -0,0 +1,5 @@
+---
+'sv': patch
+---
+
+feat(sv): improve `vitest` v3 detection
diff --git a/packages/sv/src/addons/vitest-addon.ts b/packages/sv/src/addons/vitest-addon.ts
index 2d6657d1c..34a77cb03 100644
--- a/packages/sv/src/addons/vitest-addon.ts
+++ b/packages/sv/src/addons/vitest-addon.ts
@@ -1,4 +1,4 @@
-import { color, createPrinter, dedent, transforms } from '@sveltejs/sv-utils';
+import { coerceVersion, color, createPrinter, dedent, transforms } from '@sveltejs/sv-utils';
 import { defineAddon, defineAddonOptions } from '../core/config.ts';
 
 const options = defineAddonOptions()
@@ -27,10 +27,10 @@ export default defineAddon({
 		const unitTesting = options.usages.includes('unit');
 		const componentTesting = options.usages.includes('component');
 
-		vitestV3Installed = (dependencyVersion('vitest') ?? '')
-			.replaceAll('^', '')
-			.replaceAll('~', '')
-			?.startsWith('3.');
+		const vitestVersion = dependencyVersion('vitest');
+		if (vitestVersion) {
+			vitestV3Installed = coerceVersion(vitestVersion).major === 3;
+		}
 
 		sv.devDependency('vitest', '^4.1.3');