# @shade/transport-webrtc

V3.11 — direct peer-to-peer chunk transport for Shade transfers via
`RTCDataChannel`. Plugs into `@shade/transfer`'s `ITransferTransport`
contract and wires automatically into `@shade/sdk` via
`shade.configureWebRTC()`.

```ts
import { createShade } from '@shade/sdk';
import { nativeRtcFactory } from '@shade/transport-webrtc';

const shade = await createShade({ prekeyServer });
shade.configureWebRTC({ factory: nativeRtcFactory() });
shade.configureTransfers({ resolveBaseUrl });

await shade.upload({ to: 'bob', input: file });    // → P2P when NAT allows,
                                                    //   HTTP otherwise.
```

See [docs/webrtc.md](../../docs/webrtc.md) for the full guide:
NAT-traversal realities, TURN config, glare resolution, wire format,
diagnostics, and end-to-end test recipes.

## What's inside

- `WebRtcConnection` — one peer connection between two Shade endpoints,
  driving offer/answer/ICE through Shade's own ratchet.
- `WebRtcConnectionManager` — per-peer pool with deterministic glare
  resolution.
- `WebRtcSignalingChannel` — JSON signaling messages multiplexed over
  `Shade.send` / `Shade.onMessage`.
- `WebRtcTransferTransport` — implements `ITransferTransport` over the
  managed DataChannel; ack-correlated by 16-byte requestId tokens.
- `MemoryRtcFactory` — in-process WebRTC simulator for tests.
- `nativeRtcFactory()` — adapter over `globalThis.RTCPeerConnection`
  (browsers / Deno / Cloudflare Workers).

## Adapters

`@shade/transport-webrtc` ships only the standard-API adapter
(`nativeRtcFactory`). For Bun / Node, wrap your library of choice
behind the `IRtcFactory` interface — only `createPeerConnection`,
`createDataChannel`, and standard `addEventListener` are required.

Recommended adapters:

- [`node-datachannel`](https://github.com/murat-dogan/node-datachannel)
- [`@roamhq/wrtc`](https://www.npmjs.com/package/@roamhq/wrtc)