What is the proper way to expand an interface by adding an asynchronous function?

Is there a recommended approach for extending an interface with an async function in TypeScript?

One useful technique could be adding a property to the async function that acts as a constant, similar to this example.

However, there seems to be a challenge in applying the AugmentedExample interface to multiple different async functions using this method.

In another example, using generics with the interface results in a TypeScript exception: 

An interface may only extend a class or another interface.
. This is due to TypeScript not being able to verify if the generic can be used to extend an interface. Finding a way to limit the generic and make it suitable for extending interfaces remains a challenge.

Any guidance on resolving this issue would be greatly appreciated.

typescript

Answer №1

You may choose to utilize an intersection type in place of extending the interface:

type Enhancement = 'Enhancement';

type EnhancedSample <GenericOriginalSample> = GenericOriginalSample &
{
    ENHANCEMENT: Enhancement;
};

const ENHANCEMENT = 'Enhancement';

async function sample(a: number)
{
    return true;
};

const enhancedProcessor = sample as EnhancedSample <typeof sample>;
enhancedProcessor.ENHANCEMENT = ENHANCEMENT;

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