Pebble SDK 4.2-beta4 - Changelog

Release Date: October 12 2016

This is a developer preview for SDK 4.2. No firmware is provided.

Emery can now run apps compiled for Basalt (SDK 4.1 or earlier) or Aplite (SDK 3.7 or earlier) in "bezel mode".
Fixed health_service_metric_accessible for heartrate-related metrics.
Rocky.js: The reliability of the postMessage API has been improved.
Rocky.js: postmessageconnected, postmessagedisconnected and postmessageerror events have been added.
Rocky.js: Using regular expressions no longer results in substantial app log spam.
Rocky.js: The default app template has been improved.
Rocky.js: The coordinate system was adjusted by 0.5 pixels; (0, 0) now refers to top left of the first pixel, rather than the center of the pixel.
Rocky.js: The memorypressure event has been added. When fired with {level: 'high'}, the app must free up sufficient memory or it will be terminated.
Rocky.js: Content size is exposed via UserPreferences.
Rocky.js: watchInfo.platform now works as expected in the emulator.
Rocky.js: Removed the global print() function; use console.log().
Rocky.js: Fixed a crash when passing invalid values to clearTimeout or clearInterval.
Rocky.js: Provided constructors for CanvasRenderingContext2D, RockyCanvasElement and Event.
Rocky.js: Removed unimplemented methods that previously threw an exception when called, allowing for polyfills of those methods.
Rocky.js: Added the ability to unsubscribe from events using removeEventListener or off.
Bug fixes and improvements.

Added support for the Emery platform.
Rocky.js is now considered stable, and can be used to submit apps to the appstore.
Added preferred_content_size() to retrieve the user's preferred font size.
All JS bundling is now performed using webpack
- Only JavaScript files that are actually used are now bundled.

Clay does not work after building with SDK 4.2-beta4.
Apps that use an external bundler and therefore expect require to exist at runtime in order to require('message_keys') will not work.