diff --git a/Cargo.lock b/Cargo.lock
index 12fc8de1..b2cfe865 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -180,6 +180,12 @@ dependencies = [
  "alloc-stdlib",
 ]
 
+[[package]]
+name = "build-print"
+version = "1.0.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "d8e6738dfb11354886f890621b4a34c0b177f75538023f7100b608ab9adbd66b"
+
 [[package]]
 name = "bumpalo"
 version = "3.19.0"
@@ -2418,6 +2424,7 @@ dependencies = [
 name = "trusted-server-js"
 version = "0.1.0"
 dependencies = [
+ "build-print",
  "hex",
  "sha2 0.10.9",
  "which",
diff --git a/Cargo.toml b/Cargo.toml
index 5133b733..9f0385e9 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -41,6 +41,7 @@ debug = 1
 async-trait = "0.1"
 base64 = "0.22"
 brotli = "8.0"
+build-print = "1.0.1"
 bytes = "1.11"
 chacha20poly1305 = "0.10"
 chrono = "0.4.42"
diff --git a/crates/js/Cargo.toml b/crates/js/Cargo.toml
index 1917e9b8..905f9304 100644
--- a/crates/js/Cargo.toml
+++ b/crates/js/Cargo.toml
@@ -18,6 +18,7 @@ repository = "https://example.invalid/trusted-server"
 readme = "README.md"
 
 [build-dependencies]
+build-print = { workspace = true }
 which = { workspace = true }
 
 [dependencies]
diff --git a/crates/js/build.rs b/crates/js/build.rs
index 15417160..92023200 100644
--- a/crates/js/build.rs
+++ b/crates/js/build.rs
@@ -5,6 +5,8 @@ use std::fs;
 use std::path::{Path, PathBuf};
 use std::process::Command;
 
+use build_print::{info, warn};
+
 const UNIFIED_BUNDLE: &str = "tsjs-unified.js";
 
 fn main() {
@@ -34,14 +36,14 @@ fn main() {
     // If Node/npm is absent, keep going if dist exists
     let npm = which::which("npm").ok();
     if npm.is_none() {
-        println!("cargo:warning=tsjs: npm not found; will use existing dist if available");
+        warn!("tsjs: npm not found; will use existing dist if available");
     }
 
     // Install deps if node_modules missing
     if !skip {
-        if let Some(npm_path) = npm.clone() {
+        if let Some(npm_path) = npm.as_deref() {
             if !ts_dir.join("node_modules").exists() {
-                let status = Command::new(npm_path.clone())
+                let status = Command::new(npm_path)
                     .arg("install")
                     .current_dir(&ts_dir)
                     .status();
@@ -50,9 +52,7 @@ fn main() {
                     .map(std::process::ExitStatus::success)
                     .unwrap_or(false)
                 {
-                    println!(
-                        "cargo:warning=tsjs: npm install failed; using existing dist if available"
-                    );
+                    warn!("tsjs: npm install failed; using existing dist if available");
                 }
             }
         }
@@ -60,7 +60,7 @@ fn main() {
 
     // Run tests if requested
     if !skip && npm.is_some() && env::var("TSJS_TEST").map(|v| v == "1").unwrap_or(false) {
-        let _ = Command::new(npm.clone().unwrap())
+        let _ = Command::new(npm.as_deref().unwrap())
             .args(["run", "test", "--", "--run"]) // ensure non-watch
             .current_dir(&ts_dir)
             .status();
@@ -68,13 +68,13 @@ fn main() {
 
     // Build unified bundle
     if !skip {
-        if let Some(npm_path) = npm.clone() {
-            println!("cargo:warning=tsjs: Building unified bundle");
+        if let Some(npm_path) = npm.as_deref() {
+            info!("tsjs: Building unified bundle");
             let js_modules = env::var("TSJS_MODULES").unwrap_or("".to_string());
 
-            let status = Command::new(&npm_path)
+            let status = Command::new(npm_path)
                 .env("TSJS_MODULES", js_modules)
-                .args(["run", "build:custom"])
+                .args(["run", "build"])
                 .current_dir(&ts_dir)
                 .status();
             if !status
@@ -82,12 +82,12 @@ fn main() {
                 .map(std::process::ExitStatus::success)
                 .unwrap_or(false)
             {
-                panic!("tsjs: npm run build:custom failed - refusing to use stale bundle");
+                panic!("tsjs: npm run build failed - refusing to use stale bundle");
             }
         }
     }
 
-    // Copy unified bundle into OUT_DIR for include_str!
+    // Copy bundle into OUT_DIR for include_str!
     copy_bundle(UNIFIED_BUNDLE, true, &crate_dir, &dist_dir, &out_dir);
 }
 
diff --git a/crates/js/lib/package.json b/crates/js/lib/package.json
index 93164d3f..8b508f6a 100644
--- a/crates/js/lib/package.json
+++ b/crates/js/lib/package.json
@@ -6,7 +6,6 @@
   "description": "Trusted Server tsjs TypeScript library with queue and simple banner rendering.",
   "scripts": {
     "build": "vite build",
-    "build:custom": "vite build",
     "dev": "vite build --watch",
     "test": "vitest run",
     "test:watch": "vitest",
diff --git a/crates/js/lib/vite.config.ts b/crates/js/lib/vite.config.ts
index 8b9ed866..a6cc7005 100644
--- a/crates/js/lib/vite.config.ts
+++ b/crates/js/lib/vite.config.ts
@@ -84,8 +84,6 @@ export type ModuleName = ${finalModules.map((m) => `'${m}'`).join(' | ')};
 
 export default defineConfig(() => {
   const distDir = path.resolve(__dirname, '../dist');
-  const buildTimestamp = new Date().toISOString();
-  const banner = `// build: ${buildTimestamp}\n`;
 
   return {
     build: {
@@ -93,11 +91,11 @@ export default defineConfig(() => {
       outDir: distDir,
       assetsDir: '.',
       sourcemap: false,
-      minify: 'esbuild',
+      minify: 'esbuild' as const,
       rollupOptions: {
         input: path.resolve(__dirname, 'src/index.ts'),
         output: {
-          format: 'iife',
+          format: 'iife' as const,
           dir: distDir,
           entryFileNames: 'tsjs-unified.js',
           inlineDynamicImports: true,