TypeScript 2.0 beta was released today. Among the big list of 2.0 awesomeness, the headline feature is non-null types.
Non-null types is currently opt-in: you pass a –strictNullChecks flag to the compiler to enable non-null types.
Enabling this feature in a Visual Studio project wasn’t obvious to me. This post shows how to do that.
Once you’ve downloaded the TypeScript 2.0 beta for VS 2015, open your project in Visual Studio. It will prompt you to upgrade the project to the new TypeScript tooling.
Once you’ve done this, open your .csproj in a text editor. Scroll down and find the TypeScript property group:
You’ll want to add the line:
<TypeScriptStrictNullChecks>True</TypeScriptStrictNullChecks>
inside the property group, as shown above.
Save the .csproj, reload it in Visual Studio, and the feature will be enabled.
Bonus: this is also how you’d enable the new 2.0 compiler flags, noUnusedParameters and noUnusedLocals:
<TypeScriptNoUnusedParameters>True</TypeScriptNoUnusedParameters> <TypeScriptNoUnusedLocals>True</TypeScriptNoUnusedLocals>