feat(build): support tsdown for building

.github/workflows/lint.yml

@@ -14,10 +14,10 @@ jobs:
       - name: Checkout code
         uses: actions/checkout@v4
 
-      - name: Use Node.js 20.x
+      - name: Use Node.js
         uses: actions/setup-node@v4
         with:
-          node-version: "20.x"
+          node-version-file: ".node-version"
           cache: "npm"
 
       - name: Install dependencies

.github/workflows/manual-publish.yml

@@ -32,7 +32,7 @@ jobs:
       - name: Setup Node.js
         uses: actions/setup-node@v4
         with:
-          node-version: 20
+          node-version-file: ".node-version"
           cache: "npm"
           registry-url: "https://registry.npmjs.org"
 

.github/workflows/preview-publish.yml

@@ -15,7 +15,7 @@ jobs:
       - name: Setup Node.js
         uses: actions/setup-node@v4
         with:
-          node-version: 20
+          node-version-file: ".node-version"
           cache: "npm"
           registry-url: "https://registry.npmjs.org"
 

.github/workflows/test.yml

@@ -14,10 +14,10 @@ jobs:
       - name: Checkout code
         uses: actions/checkout@v4
 
-      - name: Use Node.js 20.x
+      - name: Use Node.js
         uses: actions/setup-node@v4
         with:
-          node-version: "20.x"
+          node-version-file: ".node-version"
           cache: "npm"
 
       - name: Install dependencies

.github/workflows/typecheck.yml

@@ -0,0 +1,27 @@
+name: Typecheck
+
+on:
+  push:
+    branches: [main]
+  pull_request:
+    branches: [main]
+
+jobs:
+  typecheck:
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v4
+
+      - name: Use Node.js
+        uses: actions/setup-node@v4
+        with:
+          node-version-file: ".node-version"
+          cache: "npm"
+
+      - name: Install dependencies
+        run: npm ci
+
+      - name: Run typecheck
+        run: npm run typecheck

.node-version

@@ -0,0 +1 @@
+20.19.0

AGENTS.md

@@ -11,6 +11,7 @@ The Base44 CLI is a TypeScript-based command-line tool built with:
 - **@clack/prompts** - Interactive user prompts and UI components
 - **Zod** - Schema validation for API responses, config files, and user inputs
 - **TypeScript** - Primary language
+- **tsdown** - Bundler (powered by Rolldown, the Rust-based Rollup successor)
 
 ### Project Structure
 - **Package**: `base44` - Single package published to npm
@@ -111,14 +112,21 @@ import { entityResource } from "@core/resources/entity/index.js";
 ## Development
 
 ```bash
-npm run build    # tsc && tsc-alias
-npm run dev      # tsx for development
-npm test         # vitest
+npm run build      # tsdown - bundles to single file in dist/cli/index.js
+npm run typecheck  # tsc --noEmit - type checking only
+npm run dev        # tsx for development
+npm test           # vitest
 ```
 
+### Node.js Version
+
+This project requires Node.js >= 20.19.0. A `.node-version` file is provided for fnm/nodenv.
+
 ## File Locations
 
 - `cli/plan.md` - Implementation plan
 - `cli/AGENTS.md` - This file
 - `cli/src/core/` - Core module
 - `cli/src/cli/` - CLI commands
+- `cli/tsdown.config.ts` - Build configuration
+- `cli/.node-version` - Node.js version pinning