- Semantic menus: #3182
- Settings editor now allows comments and provides setting validation: #3167
- Switch to Yarn as the package manager: #3182
- Support for carriage return in outputs: #2761
- Upgrade to TypeScript 2.6: #3288
- Cleanup of the build, packaging, and extension systems.
jupyter labextension installis now the recommended way to install a local directory. Local directories are considered linked to the application. cf #3182
--dev-modeare now semantically different.