diff --git a/pkgs/by-name/ro/rolldown/package.nix b/pkgs/by-name/ro/rolldown/package.nix
new file mode 100644
index 000000000000..c72f51a8c50e
--- /dev/null
+++ b/pkgs/by-name/ro/rolldown/package.nix
@@ -0,0 +1,92 @@
+{
+  stdenv,
+  fetchFromGitHub,
+  fetchPnpmDeps,
+  pnpmConfigHook,
+  pnpm_10,
+  nodejs_22,
+  rustPlatform,
+  cargo,
+  rustc,
+  cmake,
+  version ? "1.0.0-rc.5",
+}:
+stdenv.mkDerivation (finalAttrs: {
+  pname = "rolldown";
+  # Default from top-level; .override { version = "..." } replaces this via merge, and src/cargoDeps/pnpmDeps use finalAttrs.version below.
+  version = version;
+
+  # To obtain hashes: use `nix store prefetch-file --unpack <url>` for source; set hash = "" and build for cargoDeps/pnpmDeps.
+  src = fetchFromGitHub {
+    owner = "rolldown";
+    repo = "rolldown";
+    rev = "v${finalAttrs.version}";
+    hash = "sha256-uqgJN7jn70z3cQlEEyk+0TeiHDn1AkvMmCaEOksHxhM=";
+  };
+  cargoDeps = rustPlatform.fetchCargoVendor {
+    pname = "rolldown";
+    version = finalAttrs.version;
+    src = finalAttrs.src;
+    hash = "sha256-tyayOAwdqP1euzicJrstwHiHxoFRWq+IGSiN/uFNZz8=";
+  };
+  pnpmDeps = fetchPnpmDeps {
+    pname = "rolldown";
+    version = finalAttrs.version;
+    src = finalAttrs.src;
+    pnpm = pnpm_10;
+    fetcherVersion = 3;
+    hash = "sha256-16NBCf4dP8a8dbgnmtFawMHKD7geIkLXt4F4w18FSUM=";
+  };
+
+  # cmake is only needed for Rust build (mimalloc-sys), not for a top-level configure
+  dontUseCmakeConfigure = true;
+
+  nativeBuildInputs = [
+    pnpmConfigHook
+    pnpm_10
+    nodejs_22
+    rustPlatform.cargoSetupHook
+    cargo
+    rustc
+    cmake
+  ];
+
+  buildPhase = ''
+    runHook preBuild
+
+    pnpm run --filter "@rolldown/pluginutils" build
+    pnpm run --filter rolldown build-native:release
+
+    runHook postBuild
+  '';
+
+  installPhase = ''
+    runHook preInstall
+
+    local -r nodeModules="$out/lib/node_modules"
+    mkdir -p "$nodeModules"
+
+    # Install rolldown package
+    local -r outPath="$nodeModules/rolldown"
+    mkdir -p "$outPath"
+    cp packages/rolldown/package.json "$outPath/"
+    for d in bin cli dist; do
+      [[ -d packages/rolldown/$d ]] && cp -r "packages/rolldown/$d" "$outPath/"
+    done
+    cp packages/rolldown/*.node "$outPath/" 2>/dev/null || true
+    cp packages/rolldown/dist/*.node "$outPath/dist/" 2>/dev/null || true
+    cp packages/rolldown/src/rolldown-binding.*.node "$outPath/dist/" 2>/dev/null || true
+
+    # Install @rolldown/pluginutils (rolldown's runtime dependency; only built output, no node_modules)
+    mkdir -p "$nodeModules/@rolldown/pluginutils"
+    cp packages/pluginutils/package.json "$nodeModules/@rolldown/pluginutils/"
+    [[ -d packages/pluginutils/dist ]] && cp -r packages/pluginutils/dist "$nodeModules/@rolldown/pluginutils/"
+
+    runHook postInstall
+  '';
+
+  meta = {
+    description = "Fast Rust-based bundler for JavaScript (built for openclaw)";
+    inherit (nodejs_22.meta) platforms;
+  };
+})