build: Setup tsdown

Author: vio

package-lock.json

@@ -25,30 +25,39 @@
     "rollup-plugin",
     "bundle-stats"
   ],
-  "main": "./dist/cjs/index.js",
-  "module": "./dist/esm/index.js",
-  "typings": "./dist/types/index.d.ts",
+  "main": "./dist/index.cjs",
+  "module": "./dist/index.mjs",
+  "typings": "./dist/index.d.cts",
   "files": [
     "dist"
   ],
   "exports": {
     ".": {
-      "types": "./dist/types/index.d.ts",
-      "import": "./dist/esm/index.js",
-      "require": "./dist/cjs/index.js"
+      "import": {
+        "types": "./dist/index.d.mts",
+        "default": "./dist/index.mjs"
+      },
+      "require": {
+        "types": "./dist/index.d.cts",
+        "default": "./dist/index.cjs"
+      }
     },
     "./extract": {
-      "types": "./dist/types/extract.d.ts",
-      "import": "./dist/esm/extract.js",
-      "require": "./dist/cjs/extract.js"
+      "import": {
+        "types": "./dist/extract.d.mts",
+        "default": "./dist/extract.mjs"
+      },
+      "require": {
+        "types": "./dist/extract.d.cts",
+        "default": "./dist/extract.cjs"
+      }
     }
   },
   "engines": {
     "node": ">=18"
   },
   "scripts": {
-    "build": "npm run clean && npm run type-check && rollup -c && npm run build-esm-packages",
-    "build-esm-packages": "echo '{\"type\":\"module\"}' > dist/esm/package.json",
+    "build": "npm run clean && npm run type-check && tsdown",
     "clean": "rimraf ./dist",
     "type-check": "tsc",
     "lint": "eslint",
@@ -65,10 +74,6 @@
   "devDependencies": {
     "@eslint/js": "9.39.2",
     "@release-it/conventional-changelog": "10.0.5",
-    "@rollup/plugin-commonjs": "^28.0.6",
-    "@rollup/plugin-node-resolve": "^16.0.1",
-    "@rollup/plugin-typescript": "12.3.0",
-    "@tsconfig/node18": "18.2.6",
     "@types/deep-freeze-strict": "1.1.2",
     "@types/node": "25.2.1",
     "deep-freeze-strict": "1.1.1",
@@ -82,6 +87,7 @@
     "release-it": "19.2.4",
     "rimraf": "6.0.1",
     "rollup": "4.57.1",
+    "tsdown": "0.20.3",
     "typescript": "5.9.3",
     "typescript-eslint": "8.54.0",
     "vite": "7.3.1",

package.json

@@ -1,8 +1,10 @@
 import type {
   Plugin as RollupPlugin,
   OutputOptions as RollupOutputOptions,
+  OutputBundle as RollupOutputBundle,
 } from 'rollup';
 import type { Plugin as VitePlugin } from 'vite';
 
 export type Plugin = VitePlugin & RollupPlugin;
 export type OutputOptions = RollupOutputOptions;
+export type OutputBundle = RollupOutputBundle;

rollup.config.mjs

@@ -2,8 +2,8 @@ import { describe, test, expect } from 'vitest';
 import deepFreeze from 'deep-freeze-strict';
 
 import extract from '../../src/extract';
+import type { OutputBundle } from '../../src/types';
 import * as rollupStats from './fixtures/rollup-stats';
-import type { OutputBundle } from 'rollup';
 
 const fixtures = rollupStats.stats as unknown as OutputBundle;
 

src/types.ts

@@ -1,3 +1,32 @@
 {
-  "extends": "./tsconfig.base.json"
+  "compilerOptions": {
+    /* dirs */
+    "rootDir": "./src",
+    "outDir": "./dist",
+    "declarationDir": "./dist/types",
+    "types": ["node"],
+    /* target config for node 18 */
+    "target": "es2022",
+    "lib": ["es2022", "es2022.error"],
+    "moduleResolution": "node",
+    "resolveJsonModule": true,
+    "esModuleInterop": true,
+    /* behaviour options */
+    "strict": true,
+    "allowJs": true,
+    "allowSyntheticDefaultImports": true,
+    "noFallthroughCasesInSwitch": true,
+    "declaration": true,
+    "sourceMap": true,
+    "noImplicitReturns": true,
+    "noImplicitOverride": true,
+    "noUnusedLocals": true,
+    "noUnusedParameters": true,
+    "skipLibCheck": true,
+    "forceConsistentCasingInFileNames": true,
+    "noEmit": true,
+    "declarationMap": true
+  },
+  "include": ["src"],
+  "exclude": ["node_modules", "dist"]
 }

test/unit/extract.test.ts

@@ -0,0 +1,14 @@
+import { defineConfig } from 'tsdown';
+
+export default defineConfig({
+  entry: {
+    index: './src/index.ts',
+    extract: './src/extract.ts',
+  },
+  format: ['esm', 'cjs'],
+  dts: true,
+  unbundle: true,
+  hash: false,
+  minify: false,
+  sourcemap: true,
+});