TypeScript 1.8

• Type parameters as constraints
• Control flow analysis errors
• Stateless Function Components in React
• Simplified props type management in React
• Augmenting global/module scope from modules
• String literal types
• Improved union/intersection type inference
• Concatenate AMD and System modules with –outFile
• Support for default import interop with SystemJS
• Allow captured let/const in loops
• Improved checking for for..in statements
• Modules are now emitted with a “use strict”; prologue
• Including .js files with –allowJs
• Custom JSX factories using –reactNamespace
• this-based type guards
• Official TypeScript NuGet package
• Prettier error messages from tsc
• Colorization of JSX code in VS 2015
• The –project (-p) flag can now take any file path
• Allow comments in tsconfig.json
• Support output to IPC-driven files
• Improved support for tsconfig.json in Visual Studio 2015