diff --git a/package.json b/package.json
index 6ca4595f..462a1348 100644
--- a/package.json
+++ b/package.json
@@ -13,7 +13,7 @@
     ]
   },
   "scripts": {
-    "postinstall": "husky install && preconstruct dev",
+    "postinstall": "node scripts/postinstall.js",
     "build": "preconstruct build",
     "watch": "preconstruct watch",
     "dev": "preconstruct dev",
@@ -94,7 +94,6 @@
     "eslint-plugin-react-hooks": "^4.3.0",
     "husky": "^7.0.4",
     "patch-package": "^6.4.7",
-    "postinstall-postinstall": "^2.1.0",
     "prettier": "^2.5.1",
     "pretty-quick": "^3.1.3",
     "react": "^18.0.0",
diff --git a/packages/leva/package.json b/packages/leva/package.json
index f411aa68..385a7f5d 100644
--- a/packages/leva/package.json
+++ b/packages/leva/package.json
@@ -4,6 +4,14 @@
   "main": "dist/leva.cjs.js",
   "module": "dist/leva.esm.js",
   "types": "dist/leva.cjs.d.ts",
+  "files": [
+    "dist",
+    "src",
+    "plugin"
+  ],
+  "scripts": {
+    "prepare": "node ../../scripts/prepare-package.js"
+  },
   "license": "MIT",
   "repository": {
     "type": "git",
diff --git a/packages/plugin-bezier/package.json b/packages/plugin-bezier/package.json
index 989a586b..64d69598 100644
--- a/packages/plugin-bezier/package.json
+++ b/packages/plugin-bezier/package.json
@@ -4,6 +4,13 @@
   "main": "dist/leva-ui-plugin-bezier.cjs.js",
   "module": "dist/leva-ui-plugin-bezier.esm.js",
   "types": "dist/leva-ui-plugin-bezier.cjs.d.ts",
+  "files": [
+    "dist",
+    "src"
+  ],
+  "scripts": {
+    "prepare": "node ../../scripts/prepare-package.js"
+  },
   "license": "MIT",
   "repository": {
     "type": "git",
diff --git a/packages/plugin-dates/package.json b/packages/plugin-dates/package.json
index f651234b..d64311f1 100644
--- a/packages/plugin-dates/package.json
+++ b/packages/plugin-dates/package.json
@@ -4,6 +4,13 @@
   "main": "dist/leva-ui-plugin-dates.cjs.js",
   "module": "dist/leva-ui-plugin-dates.esm.js",
   "types": "dist/leva-ui-plugin-dates.cjs.d.ts",
+  "files": [
+    "dist",
+    "src"
+  ],
+  "scripts": {
+    "prepare": "node ../../scripts/prepare-package.js"
+  },
   "license": "MIT",
   "repository": {
     "type": "git",
diff --git a/packages/plugin-plot/package.json b/packages/plugin-plot/package.json
index 7c05e76e..c04baf53 100644
--- a/packages/plugin-plot/package.json
+++ b/packages/plugin-plot/package.json
@@ -4,6 +4,13 @@
   "main": "dist/leva-ui-plugin-plot.cjs.js",
   "module": "dist/leva-ui-plugin-plot.esm.js",
   "types": "dist/leva-ui-plugin-plot.cjs.d.ts",
+  "files": [
+    "dist",
+    "src"
+  ],
+  "scripts": {
+    "prepare": "node ../../scripts/prepare-package.js"
+  },
   "license": "MIT",
   "repository": {
     "type": "git",
diff --git a/packages/plugin-spring/package.json b/packages/plugin-spring/package.json
index 42f985bd..564acf32 100644
--- a/packages/plugin-spring/package.json
+++ b/packages/plugin-spring/package.json
@@ -4,6 +4,13 @@
   "main": "dist/leva-ui-plugin-spring.cjs.js",
   "module": "dist/leva-ui-plugin-spring.esm.js",
   "types": "dist/leva-ui-plugin-spring.cjs.d.ts",
+  "files": [
+    "dist",
+    "src"
+  ],
+  "scripts": {
+    "prepare": "node ../../scripts/prepare-package.js"
+  },
   "license": "MIT",
   "repository": {
     "type": "git",
diff --git a/scripts/postinstall.js b/scripts/postinstall.js
new file mode 100644
index 00000000..54bdcfc0
--- /dev/null
+++ b/scripts/postinstall.js
@@ -0,0 +1,51 @@
+const { execSync } = require('child_process')
+const { existsSync } = require('fs')
+
+// Skip if explicitly disabled
+if (process.env.SKIP_BUILD === '1' || process.env.SKIP_POSTINSTALL === '1') {
+  process.exit(0)
+}
+
+// Detect if this is a git install via pnpm's synthetic script names
+// pnpm creates 'npm-install', 'yarn-install', or 'pnpm-install' scripts
+// ONLY when preparing git dependencies
+const lifecycleEvent = process.env.npm_lifecycle_event
+
+// Detect git install via pnpm's store tmp directory pattern
+// pnpm prepares git dependencies in /pnpm/store/v{version}/tmp/
+const cwd = process.cwd()
+const isPnpmStoreTmp = /[/\\]pnpm[/\\]store[/\\]v\d+[/\\]tmp[/\\]/.test(cwd)
+
+const isGitInstall =
+  lifecycleEvent === 'npm-install' ||
+  lifecycleEvent === 'yarn-install' ||
+  lifecycleEvent === 'pnpm-install' ||
+  isPnpmStoreTmp
+
+// Skip if installed as sub-dependency in local development
+// (Don't skip for git installs - the ../../package.json would be the consuming project)
+if (!isGitInstall) {
+  const isSubDependency = existsSync('../../package.json')
+  if (isSubDependency) {
+    process.exit(0)
+  }
+}
+
+if (isGitInstall) {
+  // Git install: build production files
+  console.log('Building Leva for GitHub installation...')
+  try {
+    execSync('npx preconstruct build', { stdio: 'inherit' })
+  } catch (e) {
+    console.error('Build failed:', e.message)
+    process.exit(1)
+  }
+} else {
+  // Local development: use dev mode for fast linking
+  try {
+    execSync('npx preconstruct dev', { stdio: 'inherit' })
+  } catch (e) {
+    console.error('Failed to run preconstruct dev:', e.message)
+    process.exit(1)
+  }
+}
diff --git a/scripts/prepare-package.js b/scripts/prepare-package.js
new file mode 100644
index 00000000..a94eab58
--- /dev/null
+++ b/scripts/prepare-package.js
@@ -0,0 +1,35 @@
+const { execSync } = require('child_process')
+const { existsSync } = require('fs')
+const path = require('path')
+
+// Skip if explicitly disabled
+if (process.env.SKIP_BUILD === '1') {
+  process.exit(0)
+}
+
+const lifecycleEvent = process.env.npm_lifecycle_event
+
+// Git install: synthetic events from pnpm/npm/yarn
+const isGitInstall =
+  lifecycleEvent === 'npm-install' || lifecycleEvent === 'yarn-install' || lifecycleEvent === 'pnpm-install'
+
+// Publishing: prepare runs before pack/publish
+// When running from a package, go up to workspace root
+// process.cwd() is the package directory (e.g., packages/leva)
+const workspaceRoot = path.resolve(process.cwd(), '../..')
+const isInWorkspace = existsSync(path.join(workspaceRoot, 'package.json'))
+
+// Only build if:
+// 1. Git install (for consumers), OR
+// 2. Publishing (not in workspace = preparing for publish)
+if (isGitInstall || !isInWorkspace) {
+  try {
+    execSync('preconstruct build', {
+      stdio: 'inherit',
+      cwd: workspaceRoot,
+    })
+  } catch (e) {
+    console.error('Build failed:', e.message)
+    process.exit(1)
+  }
+}
diff --git a/yarn.lock b/yarn.lock
index 780bea1c..abac34f2 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -2454,7 +2454,6 @@ __metadata:
     eslint-plugin-react-hooks: ^4.3.0
     husky: ^7.0.4
     patch-package: ^6.4.7
-    postinstall-postinstall: ^2.1.0
     prettier: ^2.5.1
     pretty-quick: ^3.1.3
     react: ^18.0.0
@@ -15863,13 +15862,6 @@ __metadata:
   languageName: node
   linkType: hard
 
-"postinstall-postinstall@npm:^2.1.0":
-  version: 2.1.0
-  resolution: "postinstall-postinstall@npm:2.1.0"
-  checksum: e1d34252cf8d2c5641c7d2db7426ec96e3d7a975f01c174c68f09ef5b8327bc8d5a9aa2001a45e693db2cdbf69577094d3fe6597b564ad2d2202b65fba76134b
-  languageName: node
-  linkType: hard
-
 "potpack@npm:^1.0.1":
   version: 1.0.2
   resolution: "potpack@npm:1.0.2"