fix(ext/node): support process.stdin.unref() (#22865)

This PR adds private `[REF]()` and `[UNREF]()` methods to Stdin class,
and call them from Node.js polyfill layer (`TTY` class). This enables
`process.stdin.unref()` and `process.stdin.ref()` for the case when
stdin is terminal.

closes #21796

2 files changed, 43 insertions, 0 deletions

diff --git a/tests/integration/run_tests.rs b/tests/integration/run_tests.rs
index 6419f6ff0..eec10f64f 100644
--- a/tests/integration/run_tests.rs
+++ b/tests/integration/run_tests.rs
@@ -5359,3 +5359,32 @@ fn code_cache_npm_with_require_test() {
     assert!(!output.stderr().contains("Updating V8 code cache"));
   }
 }
+
+#[test]
+fn node_process_stdin_unref_with_pty() {
+  TestContext::default()
+    .new_command()
+    .args_vec(["run", "--quiet", "run/node_process_stdin_unref_with_pty.js"])
+    .with_pty(|mut console| {
+      console.expect("START\r\n");
+      console.write_line("foo");
+      console.expect("foo\r\n");
+      console.write_line("bar");
+      console.expect("bar\r\n");
+      console.write_line("baz");
+      console.expect("baz\r\n");
+    });
+
+  TestContext::default()
+    .new_command()
+    .args_vec([
+      "run",
+      "--quiet",
+      "run/node_process_stdin_unref_with_pty.js",
+      "--unref",
+    ])
+    .with_pty(|mut console| {
+      // if process.stdin.unref is called, the program immediately ends by skipping reading from stdin.
+      console.expect("START\r\nEND\r\n");
+    });
+}
diff --git a/tests/testdata/run/node_process_stdin_unref_with_pty.js b/tests/testdata/run/node_process_stdin_unref_with_pty.js
new file mode 100644
index 000000000..e86304981
--- /dev/null
+++ b/tests/testdata/run/node_process_stdin_unref_with_pty.js
@@ -0,0 +1,14 @@
+import process from "node:process";
+import util from "node:util";
+
+console.log("START");
+globalThis.addEventListener("unload", () => console.log("END"));
+
+const args = util.parseArgs({ options: { unref: { type: "boolean" } } });
+
+// call stdin.unref if --unref is passed
+if (args.values.unref) {
+  process.stdin.unref();
+}
+
+process.stdin.pipe(process.stdout);