1. Fix header comment — document correct env var precedence
(apiKey → GITHUB_COPILOT_TOKEN → GITHUB_TOKEN → device flow)
2. Use application/x-www-form-urlencoded for device code endpoint
3. Use application/x-www-form-urlencoded for poll endpoint
4. Add mutex (promise-based) on #getSessionToken to prevent
concurrent token refreshes and duplicate device flow prompts
5. Add DeviceCodeCallback + CopilotAdapterOptions so callers can
control device flow output instead of hardcoded console.log
6. Extract shared OpenAI wire-format helpers into openai-common.ts,
imported by both openai.ts and copilot.ts (-142 lines net)
7. Update createAdapter JSDoc to mention copilot env vars
- Add CopilotAdapter with OAuth2 device flow authentication
- Token exchange via /copilot_internal/v2/token with caching
- Premium request multiplier system (getCopilotMultiplier)
- Full model metadata catalog (COPILOT_MODELS)
- Add 'copilot' to SupportedProvider and provider union types
- Add example: examples/05-copilot-test.ts
Deathwing
JackChen