What is the best way to create a TypeScript function that can return either a string or an object?

I am working with a function that can return either a string or an object.

Here is an example:

myFunc(path: string): string | object

If I already know the exact structure of the object that I am expecting, how can I ensure that the function returns a type that matches MyObjectProps instead of just object?

For instance:

type MyObjectProps = {
  a: string;
  b: string;
}

Answer №1

Replacing the 'object' with 'MyObjectProps' is a simple solution to this problem.

myFunc(path: string): string | MyObjectProps

It is recommended to utilize an interface over a type whenever feasible:

interface MyObjectProps {
  a: string;
  b: string;
}

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