A guide to representing a TypeScript interface as a UML model

As I work on designing a class diagram for an Angular application, I come across the need to understand how TypeScript is utilized in such projects. It's worth noting that Angular apps are primarily written in TypeScript.

Within TypeScript, one interesting feature is the ability to have an instance of an interface. For example, let's take the interface 'ICube', which includes a property 'sideLength' of type number.

interface ICube {
  sideLength: number
}

In the context of a class called 'Shape', this interface is utilized to define the type of an attribute named 'myCube'. While 'myCube' itself isn't a class, it's still important for specifying the structure using the interface.

class Shape {
  myCube: ICube
}

Viewing this as a dependency that the class relies on from the ICube interface, I wonder how this relationship can be depicted in a design class diagram. Is there a standardized way to represent this dependency in UML diagrams?

Answer №1

When a class C contains a property P with a type T, class C automatically relies on type T. To simplify your modeling approach, you can do the following:

https://i.sstatic.net/SEB8G.png

If you prefer to display the dependency explicitly using a relationship, you can draw a dashed arrow from the class to the interface, as shown below:

https://i.sstatic.net/YPF1O.png

This dependency relationship, while redundant, is permissible.

On a side note, it's worth mentioning that number is not a predefined UML type. You have the option to define number as a data type in UML or utilize the predefined UML type Real.

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