What is the best way to enable autocomplete in vscode when using a function in TypeScript that returns a union type?

Is there a way to improve editor autocomplete when calling a function that returns a union type?

For instance, in the given code snippet, after invoking

getProperty<ColorfulOrCircle>()
(line 14), the variable b should display the accessible properties, but it is not happening.

1. interface Colorful {
2.   color: string;
3. }
4. interface Circle {
5.   radius: number;
6. }

8. type ColorfulOrCircle = Colorful | Circle;

10. function getProperty<T>(cc: T): T {
11.   return cc;
12. }

14. let b = getProperty<ColorfulOrCircle>({color: "red"})

15. b. ; // NO AUTOCOMPLETE

Hovering over b.color results in an error message: https://i.sstatic.net/Cgklg.png

Pressing CTRL + BACKSPACE after b. reveals only 'random' words.

https://i.sstatic.net/DdOOX.png

What changes should be made to the function to enhance intellisense?

Answer №1

By omitting a specific generic type and allowing TypeScript to deduce it, the function works flawlessly. However, it is evident that this function now mandates a generic type in its declaration. If you desire a function capable of accepting a generic parameter akin to the initial function in your query, please refer to the playground link provided at the bottom.

Snippet:

interface Colorful {
    color: string;
}
interface Circle {
    radius: number;
}

type ColorfulOrCircle = Colorful | Circle;

function getProperty<T extends ColorfulOrCircle>(cc: T) {
    return cc;
}

let b = getProperty({ color: "red" })

b. ; // AUTOCOMPLETE

Playground

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