Typescript declaration for a promised string array

Question

I have an async function that returns either a string or an array of strings. I've tried the following:

   async getAllAnnotationTimes(): Promise<string> | Promise<string[]> {
         return await this.app.client.getText(this.allAnnotationPositions);
   }

I have also used this declaration: Promise<string> | Promise<Array<string>>

Which gives this error: [ts] The return type of an async function or method must be the global Promise<T> type.

The error seems to related to the part after the or (Promise<Array<string>>)

How do I declare a promised string array?

zerkms · Accepted Answer · 2018-06-11 03:14:59Z

3

You would use

Promise<string | string[]>

which is literally a promise of a union type that is either a string or an array of strings.

answered Jun 11, 2018 at 3:14

zerkms

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