Dependencies on Modules If your library depends on a module, use an import statement:

Excess Property Checks In our first example using interfaces, TypeScript let us pass { size: number; label: string; } to something

Readonly properties Some properties should only be modifiable when an object is first created. You can specify this by putting readonly

// Type definitions for [~THE LIBRARY NAME~] [~OPTIONAL VERSION NUMBER~] // Project: [~THE PROJECT NAME~] // Definitions by: [~YOUR

Static Properties Up to this point, we’ve only talked about the instance members of the class, those that show up on the object when

Destructuring Another ECMAScript 2015 feature that TypeScript has is destructuring. For a complete reference, see

Gulp If you’re using Gulp in some fashion, we have a tutorial on using Gulp

Parameter Decorators A Parameter Decorator is declared just before a parameter declaration. The parameter decorator is applied to the

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Polymorphic this types A polymorphic this type represents a type that is the subtype of the containing class