Access the properties of an interface without the need for initialization

Attempting to design a universal "mapping" technique that can receive an interface and JSON response, and then correlate the existing keys with the interface. The main challenge faced is the apparent inability to retrieve the accessible properties of an interface without first initializing them.

Is there a method to access the content of an interface without the necessity of declaring it beforehand?

Answer №1

Dynamic information such as interfaces and type data is not accessible during runtime.

However, it is possible to create a method that can deserialize a JSON string into a specific type. For example, using

const myThing: IThing = JSON.parse(myJsonString);
will essentially convert it into the specified type IThing.

If you have a class called Thing that implements IThing, you can utilize Object.keys to loop through the keys of a created instance of Thing, and pair the corresponding key indices using a syntax like

thing[key] = JSON.parse(...)[key]

Answer №2

Interfaces and types in TypeScript are enforced during the compilation process (from TS to JS). As a result, when running JavaScript at runtime, there is no knowledge of interfaces.

However, this can be achieved by utilizing classes, along with tools like reflect-metadata and decorators. For example, projects such as class-transformer demonstrate how this can be implemented.

Answer №3

Transforming my interfaces into a class proved to be the perfect fix. This allowed me to easily generate an empty instance and display all properties that are accessible.

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