fix(ext/node): support stdin child_process IPC & fd stdout/stderr (#24106)

Add supports for "ipc" and fd options in child_process spawn API.

Internal changes: Adds a hidden rid and "ipc_for_internal_use" option to
Deno.Command. Used by `node:child_process`

Example:
```js
const out = fs.openSync("./logfile.txt", 'a')
const proc = spawn(process.execPath, ["./main.mjs", "child"], {
  stdio: ["ipc", out, "inherit"]
});
```

Ref #16753

1 files changed, 14 insertions, 5 deletions

diff --git a/ext/node/polyfills/internal/child_process.ts b/ext/node/polyfills/internal/child_process.ts
index b6137e0d1..cabae63ee 100644
--- a/ext/node/polyfills/internal/child_process.ts
+++ b/ext/node/polyfills/internal/child_process.ts
@@ -362,17 +362,25 @@ export class ChildProcess extends EventEmitter {
   }
 }
 
-const supportedNodeStdioTypes: NodeStdio[] = ["pipe", "ignore", "inherit"];
+const supportedNodeStdioTypes: NodeStdio[] = [
+  "pipe",
+  "ignore",
+  "inherit",
+  "ipc",
+];
 function toDenoStdio(
   pipe: NodeStdio | number | Stream | null | undefined,
 ): DenoStdio {
   if (pipe instanceof Stream) {
     return "inherit";
   }
+  if (typeof pipe === "number") {
+    /* Assume it's a rid returned by fs APIs */
+    return pipe;
+  }
 
   if (
-    !supportedNodeStdioTypes.includes(pipe as NodeStdio) ||
-    typeof pipe === "number"
+    !supportedNodeStdioTypes.includes(pipe as NodeStdio)
   ) {
     notImplemented(`toDenoStdio pipe=${typeof pipe} (${pipe})`);
   }
@@ -385,6 +393,8 @@ function toDenoStdio(
       return "null";
     case "inherit":
       return "inherit";
+    case "ipc":
+      return "ipc_for_internal_use";
     default:
       notImplemented(`toDenoStdio pipe=${typeof pipe} (${pipe})`);
   }
@@ -1083,8 +1093,7 @@ function toDenoArgs(args: string[]): string[] {
 
   if (useRunArgs) {
     // -A is not ideal, but needed to propagate permissions.
-    // --unstable is needed for Node compat.
-    denoArgs.unshift("run", "-A", "--unstable");
+    denoArgs.unshift("run", "-A");
   }
 
   return denoArgs;