Migrate from vite to tsdown

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Author: silverwind

Makefile

@@ -29,8 +29,8 @@ test-update: node_modules
 .PHONY: build
 build: node_modules $(DIST_FILES)
 
-$(DIST_FILES): $(SOURCE_FILES) pnpm-lock.yaml vite.config.ts
-	pnpm exec vite build
+$(DIST_FILES): $(SOURCE_FILES) pnpm-lock.yaml tsdown.config.ts
+	pnpm exec tsdown
 
 .PHONY: publish
 publish: node_modules

package.json

@@ -27,14 +27,13 @@
     "eslint-config-silverwind": "121.0.5",
     "jest-extended": "7.0.0",
     "tlds": "1.261.0",
+    "tsdown": "0.20.3",
+    "tsdown-config-silverwind": "1.7.5",
     "typescript": "5.9.3",
     "typescript-config-silverwind": "15.0.0",
     "updates": "17.5.2",
     "updates-config-silverwind": "1.0.3",
     "versions": "14.1.2",
-    "vite": "7.3.1",
-    "vite-config-silverwind": "6.0.11",
-    "vite-plugin-dts": "4.5.4",
     "vitest": "4.0.18",
     "vitest-config-silverwind": "10.6.3"
   }