feat(core): refactor shell execution to use node-pty (#6491)

Co-authored-by: Jacob Richman <jacob314@gmail.com>

packages/core/src/utils/getPty.ts

@@ -0,0 +1,34 @@
+/**
+ * @license
+ * Copyright 2025 Google LLC
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+export type PtyImplementation = {
+  // eslint-disable-next-line @typescript-eslint/no-explicit-any
+  module: any;
+  name: 'lydell-node-pty' | 'node-pty';
+} | null;
+
+export interface PtyProcess {
+  readonly pid: number;
+  onData(callback: (data: string) => void): void;
+  onExit(callback: (e: { exitCode: number; signal?: number }) => void): void;
+  kill(signal?: string): void;
+}
+
+export const getPty = async (): Promise<PtyImplementation> => {
+  try {
+    const lydell = '@lydell/node-pty';
+    const module = await import(lydell);
+    return { module, name: 'lydell-node-pty' };
+  } catch (_e) {
+    try {
+      const nodePty = 'node-pty';
+      const module = await import(nodePty);
+      return { module, name: 'node-pty' };
+    } catch (_e2) {
+      return null;
+    }
+  }
+};