feat!: drop Node.js < 22.18.0 support, make unrun optional, add tsx config loader

- Bump engines to `>=22.18.0` across all packages
- Move `unrun` from dependencies to optional peerDependencies
- Add `tsx` as a new config loader option via tsImport API
- Add `tsx` as optional peerDependency
- Update docs and references accordingly

Author: sxzz

__snapshots__/tsnapi/index.snapshot.d.ts

@@ -60,7 +60,7 @@ export interface ExportsOptions {
 }
 export interface InlineConfig extends UserConfig {
   config?: boolean | string;
-  configLoader?: "auto" | "native" | "unrun";
+  configLoader?: "auto" | "native" | "tsx" | "unrun";
   filter?: RegExp | Arrayable<string>;
 }
 export interface Logger {

docs/guide/getting-started.md

@@ -59,11 +59,7 @@ bun add -D typescript
 :::
 
 :::tip Compatibility Note
-`tsdown` requires Node.js version 20.19 or higher. Please ensure your development environment meets this requirement before installing. While `tsdown` is primarily tested with Node.js, support for Deno and Bun is experimental and may not work as expected.
-:::
-
-:::warning Node.js Deprecation
-Node.js versions below 22.18.0 are deprecated and support will be removed in the next minor release. Please upgrade to Node.js 22.18.0 or later.
+`tsdown` requires Node.js version 22.18.0 or higher. Please ensure your development environment meets this requirement before installing. While `tsdown` is primarily tested with Node.js, support for Deno and Bun is experimental and may not work as expected.
 :::
 
 ### Starter Templates {#starter-templates}

docs/options/config-file.md

@@ -67,11 +67,12 @@ This is useful if you want to rely solely on command-line options or default set
 `tsdown` supports multiple config loaders to accommodate various file formats. You can select a config loader using the `--config-loader` option. The available loaders are:
 
 - `auto` (default): Utilizes native runtime loading for TypeScript if supported; otherwise, defaults to `unrun`.
-- `native`: Loads TypeScript configuration files using native runtime support. Requires a compatible environment, such as the latest Node.js, Deno, or Bun.
-- `unrun`: Loads configuration files using the [`unrun`](https://gugustinette.github.io/unrun/) library. It provides more powerful and flexible loading capabilities.
+- `native`: Loads TypeScript configuration files using native runtime support. Requires a compatible environment, such as Node.js 22.18.0+, Deno, or Bun.
+- `tsx`: Loads configuration files using the [`tsx`](https://tsx.is/) library via its [tsImport API](https://tsx.is/dev-api/ts-import). Note that `tsx` is an optional peer dependency — you need to install it manually if you want to use this loader.
+- `unrun`: Loads configuration files using the [`unrun`](https://gugustinette.github.io/unrun/) library. It provides more powerful and flexible loading capabilities. Note that `unrun` is an optional peer dependency — you need to install it manually if you want to use this loader.
 
 > [!TIP]
-> Node.js does not natively support importing TypeScript files without specifying the file extension. If you are using Node.js and want to load a TypeScript config file without including the `.ts` extension, consider using the `unrun` loader for seamless compatibility.
+> Node.js does not natively support importing TypeScript files without specifying the file extension. If you are using Node.js and want to load a TypeScript config file without including the `.ts` extension, consider installing and using the `tsx` or `unrun` loader for seamless compatibility.
 
 ## Extending Vite or Vitest Config (Experimental)
 

docs/zh-CN/guide/getting-started.md

@@ -59,11 +59,7 @@ bun add -D typescript
 :::
 
 :::tip 兼容性说明
-`tsdown` 需要 Node.js 20.19 或更高版本。请确保您的开发环境满足此要求后再进行安装。虽然 `tsdown` 主要在 Node.js 下测试，但对 Deno 和 Bun 的支持仍为实验性，可能无法正常工作。
-:::
-
-:::warning Node.js 弃用警告
-低于 22.18.0 的 Node.js 版本已被弃用，将在下一个 minor 版本中移除支持。请升级到 Node.js 22.18.0 或更高版本。
+`tsdown` 需要 Node.js 22.18.0 或更高版本。请确保您的开发环境满足此要求后再进行安装。虽然 `tsdown` 主要在 Node.js 下测试，但对 Deno 和 Bun 的支持仍为实验性，可能无法正常工作。
 :::
 
 ### 起步模板 {#starter-templates}

docs/zh-CN/options/config-file.md

@@ -67,11 +67,12 @@ tsdown --no-config
 `tsdown` 支持多种配置加载器，以适配不同的文件格式。您可以通过 `--config-loader` 选项选择配置加载器。可用的加载器包括：
 
 - `auto`（默认）：如果运行时支持，则使用原生方式加载 TypeScript，否则回退到 `unrun`。
-- `native`：通过原生运行时支持加载 TypeScript 配置文件。需要兼容的环境，如最新版 Node.js、Deno 或 Bun。
-- `unrun`：使用 [`unrun`](https://gugustinette.github.io/unrun/) 库加载配置文件，提供更强大和灵活的加载能力。
+- `native`：通过原生运行时支持加载 TypeScript 配置文件。需要兼容的环境，如 Node.js 22.18.0+、Deno 或 Bun。
+- `tsx`：使用 [`tsx`](https://tsx.is/) 库通过其 [tsImport API](https://tsx.is/dev-api/ts-import) 加载配置文件。注意 `tsx` 是可选的 peer dependency，需要手动安装后才能使用。
+- `unrun`：使用 [`unrun`](https://gugustinette.github.io/unrun/) 库加载配置文件，提供更强大和灵活的加载能力。注意 `unrun` 是可选的 peer dependency，需要手动安装后才能使用。
 
 > [!TIP]
-> Node.js 原生需要指定文件扩展名才能导入 TypeScript 文件。如果您在 Node.js 环境下希望加载不带 `.ts` 扩展名的 TypeScript 配置文件，建议使用 `unrun` 加载器以获得更好的兼容性。
+> Node.js 原生需要指定文件扩展名才能导入 TypeScript 文件。如果您在 Node.js 环境下希望加载不带 `.ts` 扩展名的 TypeScript 配置文件，建议安装并使用 `tsx` 或 `unrun` 加载器以获得更好的兼容性。
 
 ## 扩展 Vite 或 Vitest 配置（实验性功能）{#extending-vite-or-vitest-config-experimental}
 

package.json

@@ -72,7 +72,7 @@
     }
   },
   "engines": {
-    "node": ">=20.19.0"
+    "node": ">=22.18.0"
   },
   "scripts": {
     "lint": "eslint --cache --max-warnings 0 .",
@@ -94,8 +94,10 @@
     "@tsdown/exe": "workspace:*",
     "@vitejs/devtools": "*",
     "publint": "^0.3.0",
+    "tsx": "*",
     "typescript": "^5.0.0 || ^6.0.0",
-    "unplugin-unused": "^0.5.0"
+    "unplugin-unused": "^0.5.0",
+    "unrun": "*"
   },
   "peerDependenciesMeta": {
     "@arethetypeswrong/core": {
@@ -113,11 +115,17 @@
     "publint": {
       "optional": true
     },
+    "tsx": {
+      "optional": true
+    },
     "typescript": {
       "optional": true
     },
     "unplugin-unused": {
       "optional": true
+    },
+    "unrun": {
+      "optional": true
     }
   },
   "dependencies": {
@@ -135,8 +143,7 @@
     "tinyexec": "catalog:prod",
     "tinyglobby": "catalog:prod",
     "tree-kill": "catalog:prod",
-    "unconfig-core": "catalog:prod",
-    "unrun": "catalog:prod"
+    "unconfig-core": "catalog:prod"
   },
   "inlinedDependencies": {
     "is-in-ci": "2.0.0",
@@ -174,12 +181,14 @@
     "rolldown-plugin-require-cjs": "catalog:dev",
     "sass": "catalog:dev",
     "tsnapi": "catalog:dev",
+    "tsx": "catalog:dev",
     "typescript": "catalog:dev",
     "unocss": "catalog:docs",
     "unplugin-ast": "catalog:dev",
     "unplugin-raw": "catalog:dev",
     "unplugin-unused": "catalog:peer",
     "unplugin-vue": "catalog:dev",
+    "unrun": "catalog:dev",
     "vite": "catalog:docs",
     "vitest": "catalog:dev",
     "vue": "catalog:docs"

packages/create-tsdown/package.json

@@ -53,7 +53,7 @@
     }
   },
   "engines": {
-    "node": ">=20.19.0"
+    "node": ">=22.18.0"
   },
   "scripts": {
     "dev": "node ./src/run.ts",

packages/css/package.json

@@ -42,7 +42,7 @@
     }
   },
   "engines": {
-    "node": ">=20.19.0"
+    "node": ">=22.18.0"
   },
   "scripts": {
     "build": "node -C dev ../../src/run.ts -c ../../tsdown.config.ts -F ."

packages/exe/package.json

@@ -42,7 +42,7 @@
     }
   },
   "engines": {
-    "node": ">=20.19.0"
+    "node": ">=22.18.0"
   },
   "scripts": {
     "build": "node -C dev ../../src/run.ts -c ../../tsdown.config.ts -F ."

packages/migrate/package.json

@@ -53,7 +53,7 @@
     }
   },
   "engines": {
-    "node": ">=20.19.0"
+    "node": ">=22.18.0"
   },
   "scripts": {
     "dev": "node ./src/run.ts",