Typescript: Multiple possible interfaces as an interface

Question

If I have a variable like this:

let x: number | string | undefined;

Is it possible to create an interface that supports all these types? Something like:

let x: MyCustomInterface;

Thanks!

Madara's Ghost · Accepted Answer · 2019-03-14 16:38:08Z

2

No, interfaces do not support unions inside of themselves. You can make a type alias though:

type MyCustomType = number | string | undefined;
let x: MyCustomType;

answered Mar 14, 2019 at 16:38

Madara's Ghost

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