@freestyle-sh/with-pty

Generic PTY helper for Freestyle VMs, backed by tmux.

By default, PTY helpers also add /root/.tmux.conf with:

set -g mouse on
set -g status off

Set applyDefaultTmuxConfig: false to opt out.

Installation

pnpm add @freestyle-sh/with-pty freestyle-sandboxes

Usage

import { freestyle, VmSpec } from "freestyle-sandboxes";
import { VmPty } from "@freestyle-sh/with-pty";

const { vm } = await freestyle.vms.create({
  snapshot: new VmSpec({
    with: {
      pty: new VmPty(),
    },
  }),
});

const ptyHandle = await vm.pty.createPtySession({
  id: "dev",
  command: "npm run dev",
  cwd: "/root/repo",
  ptySize: { cols: 120, rows: 30 },
  reset: true,
});

await ptyHandle.sendInput("echo hello from pty\n");

await ptyHandle.resize({ cols: 160, rows: 40 });

const sessions = await vm.pty.listPtySessions();
console.log(sessions.map((s) => s.id));

const output = await ptyHandle.read({
  lines: 80,
});

console.log(output);

const result = await ptyHandle.wait({ timeoutMs: 5_000 });
console.log(result.exitCode);

API

• Process-level methods:
  • createPtySession({ id, command, cwd, envs, ptySize, reset })
  • connectPtySession(sessionId)
  • listPtySessions()
  • getPtySessionInfo(sessionId)
  • resizePtySession(sessionId, ptySize)
  • killPtySession(sessionId)
  • attachCommand({ sessionId, readOnly })
• Handle methods (PtyHandle):
  • sendInput(data)
  • read({ lines, includeEscape })
  • resize(ptySize)
  • wait({ timeoutMs, pollIntervalMs, lines, onData })
  • waitForConnection(timeoutMs)
  • isConnected()
  • disconnect()
  • kill()

Note: This implementation uses tmux under the hood. It mirrors Daytona-style semantics where practical, but does not expose a websocket stream; wait/read use polling via tmux capture.