Exploring TypeScript's capabilities: newable objects and enum references

Currently, I am utilizing an external SDK built in JavaScript. One particular module within this SDK, called Blob, is both new-able and contains an enum named FooEnum with the members Bar and Baz.

To implement this SDK in JavaScript, the code looks like this:

const blobInstance = new Sdk.Blob();
const fooType = Sdk.Blob.FooEnum.Baz;

Now, my aim is to create an interface that allows me to cast this SDK for added type safety. Here's what I have managed to come up with so far:

interface BlobInterface { }

enum Foo {
    Bar,
    Baz
}

interface Sdk {
    Blob: {
        new(): BlobInterface;
        FooEnum: Foo;
    }
}

However, I am facing an issue where TypeScript assumes that when referencing Blob.FooEnum, it considers FooEnum to be a member of the enum itself (such as Bar or Baz) which then restricts me from accessing Baz.

Is there a way to instruct TypeScript that Blob.FooEnum actually refers to the enum directly rather than being a member of the enum?

Answer №1

Foo serves as a name for both a value and a type. In terms of a value, it denotes the object with properties labeled Bar and Baz, with corresponding values of 0 and 1 (there are also properties with keys 0 and 1, having values of "Bar" and "Baz"). When referring to a type, it encompasses the types of Foo.Bar and Foo.Baz. It is important to note that the value Foo does not match its own type, Foo.

This concept can be likened to a class scenario (for instance: class Bar {}), where the value Bar represents the constructor for the class, while the type Bar signifies the type related to an instance of the class. Once again, the value Bar differs from its type counterpart, Bar.

In both instances, to obtain the type aligned with the value labeled Foo or Bar, utilize typeof in conjunction with the value:

interface Sdk {
    Blob: {
        FooEnum: typeof Foo;
    }
}

Subsequently, FooEnum will mirror the same type as the Foo object you're working with, ensuring seamless functionality.

All the best!

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