ci: replace tsup, which is no longer maintained, with tsdown

Author: amandaguthrie

package.json

@@ -30,8 +30,9 @@
     "@changesets/cli": "^2.29.7",
     "@types/node": "^24.7.2",
     "glob": "^11.0.3",
+    "publint": "^0.3.14",
     "rimraf": "^6.0.1",
-    "tsup": "^8.5.0",
+    "tsdown": "^0.15.7",
     "tsx": "^4.20.6",
     "typescript": "^5.9.3"
   },

packages/_template/package.json

@@ -1,4 +1,5 @@
 {
+	"$schema": "https://json.schemastore.org/package.json",
 	"name": "package-template",
 	"private": "true",
 	"version": "0.0.0",
@@ -12,20 +13,20 @@
 		"url": "https://github.com/amandaguthrie/template-pnpm-typescript-monorepo.git",
 		"directory": "packages/_template"
 	},
-	"license": "MIT",
+	"license": "UNLICENSED",
 	"type": "module",
 	"main": "dist/index.cjs",
 	"module": "dist/index.js",
-	"types": "dist/index.d.cts",
 	"exports": {
 		".": {
-			"types": "./dist/index.d.cts",
-			"source": "./src/index.ts",
 			"import": {
 				"types": "./dist/index.d.ts",
 				"default": "./dist/index.js"
 			},
-			"require": "./dist/index.cjs"
+			"required": {
+				"types": "./dist/index.d.cts",
+				"default": "./dist/index.cjs"
+			}
 		},
 		"./package.json": "./package.json"
 	},
@@ -34,8 +35,8 @@
 	],
 	"side-effects": false,
 	"scripts": {
-		"build": "tsup --entry src/index.ts --entry src/index.ts --format=esm,cjs --dts",
-		"build-fast": "tsup --entry src/index.ts --entry src/index.ts --format=esm,cjs --no-dts",
+		"build": "tsdown",
+		"build-fast": "tsdown --no-dts",
 		"dev": "pnpm build-fast --watch",
 		"test": "node --import tsx tests/test.mts"
 	},

packages/_template/tsdown.config.ts

@@ -0,0 +1,11 @@
+import { defineConfig } from 'tsdown';
+
+export default defineConfig({
+	entry: ['src/index.ts'],
+	format: ['esm', 'cjs'],
+	dts: true,
+	clean: true,
+	shims: true,
+	minify: true,
+	publint: true,
+});