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#45804) # Why The dev server resolves deep links for `expo start` interactively via the terminal (`i`/`a` keystrokes) and the `/_expo/link` disambiguation page used by QR codes. There is no programmatic surface for external tooling (preview systems, IDE integrations, distributed dev environments) to ask the running dev server "what URL should I use to open this project on iOS/Android/web?" without scraping the disambiguation HTML. This adds a documented `/_expo/open` endpoint that returns structured info about how to open the project, mirroring the CLI's existing resolution behavior. # How - New `OpenMiddleware` registered at `/_expo/open` supporting `GET` (discovery / per-platform info) and `POST` (action — actually opens the project). - New `createOpenMiddlewareOptions` factory that wires the middleware to the same runtime resolution and platform-launch logic used by the keyboard shortcuts. - Per-platform responses include `runtime` (`expo` | `custom` | `web`, omitted when disambiguation is required), `url`, and `appId` (bundle identifier / package name) so callers can check install state before deep linking. - `runtime` request parameter accepts `default` (mirrors `i`/`a`), `expo` / `custom` (force a direct link), and `unknown` (force the disambiguation page). - Response cache disabled; no host machine info leaked in responses. # Test Plan - Unit tests for the middleware and option factory covering discovery, per-platform GET, POST actions, runtime disambiguation, missing scheme, missing app ID, and the `unknown` runtime override (~736 lines of new tests). - `yarn lint`, `yarn tsc --noEmit`, and `yarn prepare` all clean in `packages/@expo/cli`. --------- Co-authored-by: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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