diff --git a/package.json b/package.json
index 6a2d0faa..c679519e 100644
--- a/package.json
+++ b/package.json
@@ -44,12 +44,12 @@
     "examples/*"
   ],
   "scripts": {
-    "postinstall": "node scripts/setup-bun.mjs || echo 'setup-bun.mjs failed or not available'",
     "start": "npm run examples:dev",
     "generate:schemas": "tsx scripts/generate-schemas.ts && prettier --write \"src/generated/**/*\"",
     "sync:snippets": "bun scripts/sync-snippets.ts",
     "build": "npm run generate:schemas && npm run sync:snippets && node scripts/run-bun.mjs build.bun.ts && node scripts/link-self.mjs",
-    "prepack": "npm run build",
+    "prepack": "npm run build && node scripts/strip-optional-deps.mjs",
+    "postpack": "node scripts/restore-package-json.mjs",
     "build:all": "npm run examples:build",
     "test": "bun test src",
     "test:e2e": "playwright test",
diff --git a/scripts/restore-package-json.mjs b/scripts/restore-package-json.mjs
new file mode 100644
index 00000000..8f2bb36d
--- /dev/null
+++ b/scripts/restore-package-json.mjs
@@ -0,0 +1,14 @@
+#!/usr/bin/env node
+// Restores the original package.json after packing (saved by strip-optional-deps.mjs).
+
+import { copyFileSync, unlinkSync } from "fs";
+import { join, dirname } from "path";
+import { fileURLToPath } from "url";
+
+const __dirname = dirname(fileURLToPath(import.meta.url));
+const pkgPath = join(__dirname, "..", "package.json");
+
+copyFileSync(pkgPath + ".bak", pkgPath);
+unlinkSync(pkgPath + ".bak");
+
+console.log("[restore-package-json] Restored original package.json");
diff --git a/scripts/strip-optional-deps.mjs b/scripts/strip-optional-deps.mjs
new file mode 100644
index 00000000..f10a2672
--- /dev/null
+++ b/scripts/strip-optional-deps.mjs
@@ -0,0 +1,32 @@
+#!/usr/bin/env node
+// Strips dev-only platform binaries (@oven/bun-*, @rollup/rollup-*) from
+// optionalDependencies before packing. Consumers don't need these.
+// Original is saved to package.json.bak and restored by restore-package-json.mjs (postpack).
+
+import { readFileSync, writeFileSync, copyFileSync } from "fs";
+import { join, dirname } from "path";
+import { fileURLToPath } from "url";
+
+const __dirname = dirname(fileURLToPath(import.meta.url));
+const pkgPath = join(__dirname, "..", "package.json");
+
+copyFileSync(pkgPath, pkgPath + ".bak");
+
+const DEV_ONLY_PREFIXES = ["@oven/bun-", "@rollup/rollup-"];
+
+const pkg = JSON.parse(readFileSync(pkgPath, "utf8"));
+const optional = pkg.optionalDependencies;
+if (optional) {
+  const removed = [];
+  for (const name of Object.keys(optional)) {
+    if (DEV_ONLY_PREFIXES.some((p) => name.startsWith(p))) {
+      delete optional[name];
+      removed.push(name);
+    }
+  }
+  if (Object.keys(optional).length === 0) delete pkg.optionalDependencies;
+  writeFileSync(pkgPath, JSON.stringify(pkg, null, 2) + "\n");
+  console.log(
+    `[strip-optional-deps] Removed ${removed.length} dev-only packages from optionalDependencies`,
+  );
+}