fix(ext/node): handle null in stdio array (#23048)

Fixes https://github.com/denoland/deno/issues/23045

ext/node/polyfills/internal/child_process.ts

@@ -503,11 +503,20 @@ function normalizeStdioOption(
   if (Array.isArray(stdio)) {
     // `[0, 1, 2]` is equivalent to `"inherit"`
     if (
-      stdio.length === 3 && stdio[0] === 0 && stdio[1] === 1 && stdio[2] === 2
+      stdio.length === 3 &&
+      (stdio[0] === 0 && stdio[1] === 1 && stdio[2] === 2)
     ) {
       return ["inherit", "inherit", "inherit"];
     }
 
+    // `[null, null, null]` is equivalent to `"pipe"
+    if (
+      stdio.length === 3 &&
+        stdio[0] === null || stdio[1] === null || stdio[2] === null
+    ) {
+      return ["pipe", "pipe", "pipe"];
+    }
+
     // At least 3 stdio must be created to match node
     while (stdio.length < 3) {
       ArrayPrototypePush(stdio, undefined);

tests/unit_node/child_process_test.ts

@@ -810,3 +810,16 @@ Deno.test(async function spawnCommandNotFoundErrno() {
   });
   await promise;
 });
+
+// https://github.com/denoland/deno/issues/23045
+Deno.test(function spawnCommandNullStdioArray() {
+  const ret = spawnSync(
+    `"${Deno.execPath()}" eval "console.log('hello');console.error('world')"`,
+    {
+      stdio: [null, null, null],
+      shell: true,
+    },
+  );
+
+  assertEquals(ret.status, 0);
+});