fix(ext/node): don't throw error for unsupported signal binding on windows (#25699)

ext/node/polyfills/process.ts

@@ -517,6 +517,12 @@ Process.prototype.on = function (
       // Ignores SIGBREAK if the platform is not windows.
     } else if (event === "SIGTERM" && Deno.build.os === "windows") {
       // Ignores SIGTERM on windows.
+    } else if (
+      event !== "SIGBREAK" && event !== "SIGINT" && Deno.build.os === "windows"
+    ) {
+      // Ignores all signals except SIGBREAK and SIGINT on windows.
+      // deno-lint-ignore no-console
+      console.warn(`Ignoring signal "${event}" on Windows`);
     } else {
       EventEmitter.prototype.on.call(this, event, listener);
       Deno.addSignalListener(event as Deno.Signal, listener);
@@ -541,8 +547,10 @@ Process.prototype.off = function (
   } else if (event.startsWith("SIG")) {
     if (event === "SIGBREAK" && Deno.build.os !== "windows") {
       // Ignores SIGBREAK if the platform is not windows.
-    } else if (event === "SIGTERM" && Deno.build.os === "windows") {
+    } else if (
-      // Ignores SIGTERM on windows.
+      event !== "SIGBREAK" && event !== "SIGINT" && Deno.build.os === "windows"
+    ) {
+      // Ignores all signals except SIGBREAK and SIGINT on windows.
     } else {
       EventEmitter.prototype.off.call(this, event, listener);
       Deno.removeSignalListener(event as Deno.Signal, listener);

tests/unit_node/process_test.ts

@@ -25,6 +25,7 @@ import {
   assertThrows,
   fail,
 } from "@std/assert";
+import { assertSpyCall, assertSpyCalls, spy } from "@std/testing/mock";
 import { stripAnsiCode } from "@std/fmt/colors";
 import * as path from "@std/path";
 import { delay } from "@std/async/delay";
@@ -238,6 +239,33 @@ Deno.test({
   },
 });
 
+Deno.test({
+  name: "process.on - ignored signals on windows",
+  ignore: Deno.build.os !== "windows",
+  fn() {
+    const ignoredSignals = ["SIGHUP", "SIGUSR1", "SIGUSR2"];
+
+    for (const signal of ignoredSignals) {
+      using consoleSpy = spy(console, "warn");
+      const handler = () => {};
+      process.on(signal, handler);
+      process.off(signal, handler);
+      assertSpyCall(consoleSpy, 0, {
+        args: [`Ignoring signal "${signal}" on Windows`],
+      });
+    }
+
+    {
+      using consoleSpy = spy(console, "warn");
+      const handler = () => {};
+      process.on("SIGTERM", handler);
+      process.off("SIGTERM", handler);
+      // No warning is made for SIGTERM
+      assertSpyCalls(consoleSpy, 0);
+    }
+  },
+});
+
 Deno.test(
   { permissions: { run: true, read: true } },
   async function processKill() {