@ottervoice/runtime-react-native

The React Native runtime does not hard-depend on Expo packages: you inject recording/playback primitives so the adapter stays testable and Expo Go–friendly.

import { createExpoRuntime } from '@ottervoice/runtime-react-native';

const runtime = createExpoRuntime({
  input: {
    requestPermission: () => /* requestRecordingPermissionsAsync */,
    createPcmStream: (options, onBuffer) => /* useAudioStream bridge */,
  },
  output: {
    createSound: (uri) => /* createAudioPlayer */,
    createPcmPlaylist: () => /* AudioPlaylist */,
    writePcmChunk: (input) => /* PCM16 → temp WAV URI */,
    deleteAudioFile: (uri) => /* cleanup */,
  },
});

Full binding: examples/react-native-expo/src/expo-adapters.ts.

ExpoRuntimeOptions

Field	Notes
input	Required — see ExpoAudioInputOptions
output	Required — see ExpoAudioOutputOptions

No network adapter: providers use React Native’s global fetch / WebSocket.

ExpoAudioInputOptions

Field	Notes
createPcmStream	Preferred: native PCM mic (wrap Expo SDK 57 useAudioStream)
requestPermission	Microphone permission
createRecording / readAudioFile	Legacy whole-file recording; prefer PCM for full duplex
now	Test clock

Prefer 16 kHz · mono · PCM16. Chunks may set delivery: 'stream' | 'turn': streaming ASR consumes small buffers; batch / Audio LLM consumes full-turn WAV.

ExpoAudioOutputOptions

Field	Notes
createSound	URI → playable sound
createPcmPlaylist	Gapless PCM playlist for streamed replies
writePcmChunk	One PCM16 slice → temp WAV URI
writeAudioFile / deleteAudioFile	Full-buffer write and cleanup

During assistant playback, suspend encoded capture while keeping volume callbacks for real barge-in.

Example: examples/react-native-expo. Types: API reference.