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- Non-nullable Types
- Control Flow Analysis for Types
- Easier Module Declarations
- Async/await downlevel support
- Read-only properties
- Improved typings acquisition
If you use TypeScript, you can get TypeScript 2.0 beta from here. Alternatively, you can use NPM to install TypeScript 2.0 — to install using NPM, just open up Command Prompt on Windows or Terminal on OS X and run npm install -g typescript@beta — however, note that you’ll require Node.js to be able to use NPM.