@rushstack/rush-daemon-protocol

Public beta — this package is versioned at 0.x; its API may change between minor versions.

The engine-agnostic wire layer spoken by every client of the Rush daemon (rushd):

• Frame taxonomy — five frame types: 0x01 control-json, 0x02 log-stdout, 0x03 log-stderr, 0x04 stdin, 0x05 event.
• Length-prefixed binary codec — a streaming serializer/deserializer that is lossless for arbitrary (including non-UTF-8) payloads and tolerant of arbitrarily split or coalesced chunks.
• DAEMON_PROTOCOL_VERSION — the negotiated protocol version constant.
• Version negotiation — a hello/helloAck handshake with a typed ProtocolVersionMismatchError on major-version mismatch.
• Event contract — the 0x05 frame payload envelope (currently a placeholder mirroring @rushstack/reporter's IReporterEventEnvelope; to be replaced by a direct reference when the reporter package lands) plus namespaced rushd.* extension events.
• Per-subscription verbosity — a pure filter applied at event serialization so each client receives its own verbosity subset without mutating shared engine state.
• Resolved phased-request contracts — engine-agnostic request, enabled-state selection, parsed built-in/custom command origin, and client-scoped result types for integrations that have already parsed a command and resolved it against a real warm operation graph.
• Final command result contract — one typed success, warning, failure, or abort outcome with the authoritative Rush-compatible exit code, delivered after request output drains.
• Interactive request contracts — request-tagged stdin frames preserve arbitrary bytes, while acknowledged raw-mode controls and typed terminal-policy results remain scoped to one request.
• Request admission contracts — resolved no-wait and bounded-timeout options, typed admission failure codes, and capability-gated one-based queue-position control messages.
• Request lifecycle contracts — a validated presentation-free command envelope, cancellation, typed routing rejection/fallback, and one authoritative terminal result control. Command parsing and Rush action construction remain outside the protocol.

Part of the Rush 6 / rushd re-architecture: microsoft/rushstack#5894.

Links

• CHANGELOG.md - Find out what's new in the latest version
• API Reference

@rushstack/rush-daemon-protocol is part of the Rush Stack family of projects.