From a3df1a8cfdc18cd1eb8abd64fef1ab5399f9d4ae Mon Sep 17 00:00:00 2001
From: Claude Bot <claude-bot@bun.sh>
Date: Tue, 17 Feb 2026 08:12:11 +0000
Subject: [PATCH] fix(cli): support `node --run` when bun pretends to be node

When `bun run --bun` is used, child processes invoking `node` actually
run bun via a symlink. Node.js v22+ supports `node --run <script>` to
run package.json scripts, but bun's fake node mode silently ignored the
`--run` flag and tried to execute the script name as a file path instead.

Detect `--run` in the raw argv and delegate to `RunCommand.exec()` which
already handles package.json script resolution with pre/post scripts.

Closes #27074

Co-Authored-By: Claude <noreply@anthropic.com>
---
 src/cli/run_command.zig             | 15 +++++++++++++
 test/cli/run/as-node.test.ts        | 35 +++++++++++++++++++++++++++++
 test/regression/issue/27074.test.ts | 29 ++++++++++++++++++++++++
 3 files changed, 79 insertions(+)
 create mode 100644 test/regression/issue/27074.test.ts

diff --git a/src/cli/run_command.zig b/src/cli/run_command.zig
index f50a847fa3..87be866708 100644
--- a/src/cli/run_command.zig
+++ b/src/cli/run_command.zig
@@ -1637,6 +1637,21 @@ pub const RunCommand = struct {
             return;
         }
 
+        // Support `node --run <script>` (Node.js v22+ feature).
+        // The --run flag is silently discarded by the arg parser since it's
+        // unrecognized, but the script name ends up as ctx.positionals[0].
+        // Scan the raw argv to detect if --run was present.
+        if (ctx.positionals.len > 0) {
+            for (bun.argv) |arg| {
+                if (strings.eqlComptime(arg, "--run")) {
+                    if (exec(ctx, .{ .bin_dirs_only = false, .log_errors = true, .allow_fast_run_for_extensions = false })) |ok| {
+                        if (ok) return;
+                    } else |_| {}
+                    Global.exit(1);
+                }
+            }
+        }
+
         if (ctx.positionals.len == 0) {
             Output.errGeneric("Missing script to execute. Bun's provided 'node' cli wrapper does not support a repl.", .{});
             Global.exit(1);
diff --git a/test/cli/run/as-node.test.ts b/test/cli/run/as-node.test.ts
index 871a1809d2..8a7606d7d4 100644
--- a/test/cli/run/as-node.test.ts
+++ b/test/cli/run/as-node.test.ts
@@ -101,4 +101,39 @@ describe("fake node cli", () => {
     const temp = tempDirWithFiles("fake-node", {});
     expect(() => fakeNodeRun(temp, [])).toThrow();
   });
+
+  describe("node --run", () => {
+    test("runs a package.json script", () => {
+      const temp = tempDirWithFiles("fake-node", {
+        "package.json": JSON.stringify({
+          scripts: {
+            echo_test: "echo pass",
+          },
+        }),
+      });
+      expect(fakeNodeRun(temp, ["--run", "echo_test"]).stdout).toBe("pass");
+    });
+
+    test("runs pre/post scripts", () => {
+      const temp = tempDirWithFiles("fake-node", {
+        "package.json": JSON.stringify({
+          scripts: {
+            premyscript: "echo pre",
+            myscript: "echo main",
+            postmyscript: "echo post",
+          },
+        }),
+      });
+      expect(fakeNodeRun(temp, ["--run", "myscript"]).stdout).toBe("pre\nmain\npost");
+    });
+
+    test("errors on missing script", () => {
+      const temp = tempDirWithFiles("fake-node", {
+        "package.json": JSON.stringify({
+          scripts: {},
+        }),
+      });
+      expect(() => fakeNodeRun(temp, ["--run", "nonexistent"])).toThrow();
+    });
+  });
 });
diff --git a/test/regression/issue/27074.test.ts b/test/regression/issue/27074.test.ts
new file mode 100644
index 0000000000..7ba34f4bd8
--- /dev/null
+++ b/test/regression/issue/27074.test.ts
@@ -0,0 +1,29 @@
+import { expect, test } from "bun:test";
+import { bunEnv, bunExe, tempDirWithFiles } from "../../harness";
+
+// https://github.com/oven-sh/bun/issues/27074
+// `bun run --bun build` fails when a pre-script uses `node --run`
+test("bun run --bun works with node --run in lifecycle scripts", () => {
+  const temp = tempDirWithFiles("issue-27074", {
+    "package.json": JSON.stringify({
+      scripts: {
+        echo_test: "echo echo_test_ran",
+        prebuild: "node --run echo_test",
+        build: "echo build_ran",
+      },
+    }),
+  });
+
+  const result = Bun.spawnSync({
+    cmd: [bunExe(), "run", "--bun", "build"],
+    cwd: temp,
+    env: bunEnv,
+  });
+
+  const stdout = result.stdout.toString("utf8").trim();
+  const stderr = result.stderr.toString("utf8").trim();
+
+  expect(stdout).toContain("echo_test_ran");
+  expect(stdout).toContain("build_ran");
+  expect(result.exitCode).toBe(0);
+});