diff --git a/build/terse-cssr.js b/build/terse-cssr.js
deleted file mode 100644
index 8190391fb..000000000
--- a/build/terse-cssr.js
+++ /dev/null
@@ -1,17 +0,0 @@
-const fs = require('fs').promises
-const path = require('path')
-const terseCssr = require('./utils/terse-cssr.js')
-const { walk } = require('../scripts/utils')
-
-const dirs = ['es', 'lib'].map((d) => path.resolve(__dirname, '..', d))
-
-;(async () => {
-  for (const dir of dirs) {
-    for await (const p of walk(dir)) {
-      if (p.includes('.cssr.js')) {
-        const code = await fs.readFile(p, 'utf-8')
-        await fs.writeFile(p, terseCssr(code))
-      }
-    }
-  }
-})()
diff --git a/package.json b/package.json
index 1c505f049..1ff9ea272 100644
--- a/package.json
+++ b/package.json
@@ -7,10 +7,9 @@
   "scripts": {
     "start": "npm run dev",
     "deprecated:build:icons": "npm run clean && node build/build-icons.js",
-    "build:js": "npm run gen-version && npm run clean && tsc -p tsconfig.esm.json && tsc -p tsconfig.cjs.json && node build/terse-cssr.js",
-    "build:package": "npm run gen-version && npm run clean && node build/build-icons.js && tsc -p tsconfig.esm.json && tsc -p tsconfig.cjs.json && node build/terse-cssr.js",
-    "build:site": "./build/before-build-site.sh && node build/restore-side-effects.js && cross-env NODE_ENV=production NODE_OPTIONS=--max-old-space-size=4096 vite build && rm -rf node_modules/naive-ui && cp site/index.html site/404.html && node build/clear-side-effects.js",
-    "build:doc": "npm run gen-version && npm run build && rm -rf build-doc/dist && cross-env NODE_ENV=production webpack --config build/webpack.doc.js",
+    "build:js": "npm run gen-version && npm run clean && tsc -p tsconfig.esm.json && tsc -p tsconfig.cjs.json && node scripts/post-build",
+    "build:package": "npm run gen-version && npm run clean && node build/build-icons.js && tsc -p tsconfig.esm.json && tsc -p tsconfig.cjs.json && node scripts/post-build",
+    "build:site": "./scripts/pre-build-site.sh && node build/restore-side-effects.js && cross-env NODE_ENV=production NODE_OPTIONS=--max-old-space-size=4096 vite build && rm -rf node_modules/naive-ui && cp site/index.html site/404.html && node build/clear-side-effects.js",
     "clean": "rm -rf site lib es node_modules/naive-ui",
     "dev": "npm run clean && npm run gen-version && cross-env NODE_ENV=development vite",
     "dev:ts": "npm run clean && npm run gen-version && cross-env NODE_ENV=development TUSIMPLE=true vite",
diff --git a/scripts/post-build.js b/scripts/post-build.js
new file mode 100644
index 000000000..c5d29f23d
--- /dev/null
+++ b/scripts/post-build.js
@@ -0,0 +1,10 @@
+// terse cssr
+const { terseCssr } = require('./terse-cssr')
+
+// replace __DEV__
+const { replaceDefine } = require('./replace-define')
+
+;(async () => {
+  await terseCssr()
+  await replaceDefine()
+})()
diff --git a/build/before-build-site.sh b/scripts/pre-build-site.sh
similarity index 100%
rename from build/before-build-site.sh
rename to scripts/pre-build-site.sh
diff --git a/scripts/replace-define.js b/scripts/replace-define.js
new file mode 100644
index 000000000..687650447
--- /dev/null
+++ b/scripts/replace-define.js
@@ -0,0 +1,30 @@
+const fs = require('fs').promises
+const { walk, outDirs } = require('./utils')
+
+const alias = {
+  __DEV__: "process.env.NODE_ENV !== 'production'"
+}
+
+exports.replaceDefine = async () => {
+  const aliasKeys = Object.keys(alias)
+  const patterns = {}
+  aliasKeys.forEach((key) => {
+    patterns[key] = new RegExp(key, 'g')
+  })
+  for (const dir of outDirs) {
+    for await (const p of walk(dir)) {
+      const code = await fs.readFile(p, 'utf-8')
+      for (const key of aliasKeys) {
+        const pattern = patterns[key]
+        if (pattern.test(code)) {
+          const outCode = code.replace(pattern, alias[key])
+          await fs.writeFile(p, outCode)
+        }
+      }
+    }
+  }
+}
+
+if (require.main === module) {
+  exports.replaceDefine()
+}
diff --git a/scripts/terse-cssr.js b/scripts/terse-cssr.js
new file mode 100644
index 000000000..2593ae401
--- /dev/null
+++ b/scripts/terse-cssr.js
@@ -0,0 +1,18 @@
+const fs = require('fs').promises
+const terseCssr = require('../build/utils/terse-cssr.js')
+const { walk, outDirs } = require('./utils')
+
+exports.terseCssr = async () => {
+  for (const dir of outDirs) {
+    for await (const p of walk(dir)) {
+      if (p.includes('.cssr.js')) {
+        const code = await fs.readFile(p, 'utf-8')
+        await fs.writeFile(p, terseCssr(code))
+      }
+    }
+  }
+}
+
+if (require.main === module) {
+  exports.terseCssr()
+}
diff --git a/scripts/utils.js b/scripts/utils.js
index 36550323a..090166702 100644
--- a/scripts/utils.js
+++ b/scripts/utils.js
@@ -8,3 +8,5 @@ exports.walk = async function * walk (dir) {
     else if (d.isFile()) yield entry
   }
 }
+
+exports.outDirs = ['es', 'lib'].map((d) => path.resolve(__dirname, '..', d))
diff --git a/vue3.md b/vue3.md
index 67e176077..1e075c8d7 100644
--- a/vue3.md
+++ b/vue3.md
@@ -434,7 +434,9 @@
 
 ## Build
 
-package: tsx => es|lib => terse cssr => release site: build package => move to node_modules => setup side effects => vite build
+package: tsx => es|lib => terse cssr => replace global vars => release
+
+site: build package => move to node_modules => setup side effects => vite build => release
 
 ## Info