enhance: add bunchee to dev dep in prepare

Author: huozhi

src/prepare/index.ts

@@ -361,6 +361,14 @@ export async function prepare(
     addBuildScripts(pkgJson, cwd)
   }
 
+  // Add bunchee to devDependencies if not already present
+  if (!pkgJson.devDependencies) {
+    pkgJson.devDependencies = {}
+  }
+  if (!pkgJson.devDependencies.bunchee) {
+    pkgJson.devDependencies.bunchee = 'latest'
+  }
+
   await fsp.writeFile(pkgJsonPath, JSON.stringify(pkgJson, null, 2) + '\n')
   logger.info('Configured `exports` in package.json')
 }

test/integration/prepare-no-src/index.test.ts

@@ -56,6 +56,11 @@ describe('integration prepare-no-src', () => {
     // Should have type: 'module' since package.json didn't exist
     expect(pkgJson.type).toBe('module')
 
+    // Should have bunchee in devDependencies
+    expect(pkgJson.devDependencies).toEqual({
+      bunchee: 'latest',
+    })
+
     // Should have exports configured for index.ts
     expect(pkgJson.exports).toEqual({
       '.': {