diff --git a/package.json b/package.json
index 827bb1a..4610fce 100644
--- a/package.json
+++ b/package.json
@@ -3,6 +3,8 @@
   "private": false,
   "scripts": {
     "dev": "node ./scripts/dev.js",
+    "dev:board": "node ./scripts/dev.js board",
+    "dev:core": "node ./scripts/dev.js core",
     "build": "node ./scripts/build.js",
     "snapshot": "node ./scripts/build.js && node ./scripts/snapshot.js",
     "e2e": "mocha --exit ./__tests__/e2e.test.js",
diff --git a/packages/board/src/util/scroller.ts b/packages/board/src/util/scroller.ts
index c086e8c..4f5b3a6 100644
--- a/packages/board/src/util/scroller.ts
+++ b/packages/board/src/util/scroller.ts
@@ -27,7 +27,7 @@ export class Scroller {
     const wrapper = this._calc(position);
     // TODO
     if (this._displayCtx) {
-      console.log(wrapper);
+      console.log('scroller-wrapper ===', wrapper);
     }
 
     const ctx = this._displayCtx;
diff --git a/scripts/config.js b/scripts/config.js
index 1667dac..8fa8bce 100644
--- a/scripts/config.js
+++ b/scripts/config.js
@@ -1,20 +1,44 @@
+const packages = [
+  {
+    dirName: 'util',
+    globalName: 'iDraw.util',
+  },
+  {
+    dirName: 'board',
+    globalName: 'iDraw.Board',
+  },
+  {
+    dirName: 'core',
+    globalName: 'iDraw.Core',
+  },
+  {
+    dirName: 'idraw',
+    globalName: 'iDraw.IDraw',
+  },
+];
+
+function getTargetPackage(cmdTarget = '') {
+  let target = '';
+  if (typeof cmdTarget === 'string') {
+    target = cmdTarget.replace(/^--target-pkg\=/ig, '');
+  }
+  let pkgs = [];
+  let targetIndex = -1;
+  for (let i = 0; i < packages.length; i ++) {
+    if (packages[i] && packages[i].dirName === target) {
+      targetIndex = i;
+      break;
+    }
+  }
+  if (targetIndex >= 0) {
+    pkgs = [packages[targetIndex]];
+  } else {
+    pkgs = packages;
+  }
+  return pkgs
+}
+
 module.exports = {
-  packages: [
-    {
-      dirName: 'util',
-      globalName: 'iDraw.util',
-    },
-    {
-      dirName: 'board',
-      globalName: 'iDraw.Board',
-    },
-    {
-      dirName: 'core',
-      globalName: 'iDraw.Core',
-    },
-    {
-      dirName: 'idraw',
-      globalName: 'iDraw.IDraw',
-    },
-  ]
+  packages,
+  getTargetPackage,
 }
\ No newline at end of file
diff --git a/scripts/dev.js b/scripts/dev.js
index 2401f17..a1ffa42 100644
--- a/scripts/dev.js
+++ b/scripts/dev.js
@@ -1,4 +1,6 @@
 const execa = require('execa');
+const process = require('process');
+
 
 async function main() {
   
@@ -6,7 +8,8 @@ async function main() {
     [
       '-w',
       '-c',
-      './scripts/rollup.config.js'
+      './scripts/rollup.config.js',
+      `--target-pkg=${process.argv[2] || ''}`,
     ], { stdio: 'inherit' }
   )
 }
diff --git a/scripts/rollup.config.js b/scripts/rollup.config.js
index 778ccd5..b839d4d 100644
--- a/scripts/rollup.config.js
+++ b/scripts/rollup.config.js
@@ -1,13 +1,15 @@
 const path = require('path');
 const typescript = require('rollup-plugin-typescript2');
 const { nodeResolve } = require('@rollup/plugin-node-resolve');
-const { packages } = require('./config');
+const { getTargetPackage } = require('./config');
 const dtsPlugin = require('./util/dts-plugin');
 const stylePlugin = require('./util/style-plugin');
 
 const resolveFile = function(names = []) {
   return path.join(__dirname, '..', 'packages', ...names)
 }
+const targetMod = process.argv[5];
+const packages = getTargetPackage(targetMod);
 
 const modules = [];
 const external = [ '@idraw/types', '@idraw/util', '@idraw/board', '@idraw/core' ];
@@ -27,7 +29,8 @@ for(let i = 0; i < packages.length; i++) {
     name: pkg.globalName,
     format: 'cjs',
     exports: 'default',
-    plugins: [dtsPlugin(pkg.dirName),],
+    // plugins: [dtsPlugin(pkg.dirName),],
+    plugins: [],
     external,
   });
   modules.push({