diff --git a/package.json b/package.json
index 0f312ba9..195d88df 100644
--- a/package.json
+++ b/package.json
@@ -66,6 +66,8 @@
     "bun": ">=1.0.0"
   },
   "scripts": {
+    "clean": "node -e \"require('fs').rmSync('dist',{recursive:true,force:true})\"",
+    "prebuild": "npm run clean",
     "build": "npm run build:types:if-needed && npm run build:patterns:if-needed && tsc && tsc -p tsconfig.cli.json && npm run build:copy-wasm",
     "build:copy-wasm": "node -e \"const fs=require('fs');const src='src/embeddings/wasm/pkg';const dst='dist/embeddings/wasm/pkg';const skip=new Set(['package.json','.gitignore']);if(fs.existsSync(src)){fs.mkdirSync(dst,{recursive:true});fs.readdirSync(src).filter(f=>!skip.has(f)).forEach(f=>fs.copyFileSync(src+'/'+f,dst+'/'+f));console.log('Copied WASM pkg to dist')}\"",
     "build:types": "tsx scripts/buildTypeEmbeddings.ts",