chore(main): release 5.7.0

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🤖 I have created a release beep boop

5.7.0 (2026-07-22)

Features

• regen: listen v2 numerals, multilingual Aura-2 voices, and streaming close() fix (#522) (7f0b9e0)

Bug Fixes

• agent: re-add deprecated stt_latency to AgentV1LatencyReport (back-compat shim) (007c7e4)
• socket: make streaming close() idempotent to prevent close-handler recursion (bf3d1df)

What's in this release

SDK regeneration for 2026-07-20 (spec ff8fd2b). No breaking changes.

New API surface (Fern-owned, additive)

• listen.v2 numerals — new numerals param + ListenV2Numerals type. Connection-time only. Verified end-to-end (serializes onto the connect URL; a TTS'd digits phrase transcribes as 5 5 5 1 2 3 4 … 42 … 3rd with numerals: true vs spelled-out with false).
• New Aura-2 multilingual TTS voices — ~40 voices (es / de / nl / fr / it / ja) on SpeakV1Model / AudioGenerateRequestModel. Additive only.

Bug fix — streaming close() recursion (bf3d1df)

• The generated Socket.close() synchronously re-fires the registered close handler via handleClose(); a close handler that calls close() again (idiomatic cleanup) recursed infinitely → RangeError: Maximum call stack size exceeded. All 5 streaming sockets were affected (agent.v1, listen.v1, listen.v2, speak.v1, speak.v2); pre-existing on main.
• Fixed at the wrapper layer (CustomClient.ts, already frozen) with a shared WeakSet guard — no generated files frozen. Regression test drives the public createConnection path for all 5 services.

Bug fix — stt_latency back-compat shim (007c7e4)

• The spec removed stt_latency from AgentV1LatencyReport (docs #1006). Since it's a server-emitted (read-only) message, stt_latency?: number is re-added by hand as a deprecated read-side field (frozen in .fernignore): report.stt_latency keeps resolving (to undefined) instead of breaking existing readers at compile time — no request/wire impact. Mirrors the Python SDK's read-side shim (deepgram-python-sdk#746).
• Both shims work around generator output and can be dropped once corrected upstream.

Validation — all green

make build ✅ · make test ✅ (unit 580/580, wire 139/139) · make typecheck-tests ✅ · biome lint ✅ · biome format ✅ · 27/27 non-management examples run clean against the live API.

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[github-actions]

🤖 Created releases:

• v5.7.0

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