API: @mrbd/core

Install:

npm install @mrbd/core

Constants

• MRBD_VIEWPORT_SIZE is { width: 600, height: 600 }.
• MRBD_SAFE_MARGIN is 8.
• MRBD_MIN_TARGET_SIZE is 88.
• DPAD contains the keyboard keys used by MRBD navigation.
• isDpadKey(key) checks whether a string is one of the supported keys.

Sensors

• requestAndStartMrbdSensors(handlers) requests permission where required, attaches motion and orientation listeners, and returns a session with stop().
• MrbdOrientation includes heading, tilt, roll, and absolute.
• MrbdMotion includes acceleration, acceleration including gravity, rotation rate, interval, and computed gForce.

Location

• getCurrentMrbdPosition(options) wraps navigator.geolocation.getCurrentPosition.
• watchMrbdPosition(onPosition, onError, options) wraps navigator.geolocation.watchPosition and returns a stop() handle.

Request detection

• isMetaRayBanDisplayRequest(headers) checks whether x-requested-with is com.meta.smartglass.app.browser.
• getMrbdRequestedWithHeader(headers) reads the MRBD browser header from a Request, Headers, header record, or iterable header entries.

Storage

• readStoredJson(key, fallback, storage?)
• writeStoredJson(key, value, storage?)
• removeStoredValue(key, storage?)

All helpers are browser-safe at import time. They check browser APIs when called.