Mastering TypeScript 3 - Third Edition

Interface resolution

As we know, the interface keyword is a TypeScript language construct that we use to define the shape of classes or objects. Wherever we need to define a custom type, and need the TypeScript compiler to ensure that properties and functions are available on an object, we use an interface. Interfaces are particularly handy when describing services, where any number of services could provide the same functionality to our code. In order to create a usable dependency injector, we need to be able to answer the following question: given an interface, how do we obtain the service that is currently implementing it?

In our current Service Location implementation, we are simply using string values to both register and resolve an ...