typescript expected '=>' in function type declaration

Question

I have an interface where i define the structure of a callback like so:

interface SliderOptions {
    onCreateSlide?: (slide: Slide) => void;
    onSlideTransition?: (slide: Slide, offset: number, onTransitionComplete: () => void); // generates typescript compiler error. 
    // more options etc
}

but i get the follow error, see image below:

Why is this happening i dont get it, since the line right above it doesnt generate this error and does about the same thing imo.

Try onSlideTransition?: (slide: Slide, offset: number, onTransitionComplete: () => void)=> void; — Nadia Chibrikova
– Nadia Chibrikova, Commented Apr 13, 2021 at 20:49
yeah that fixed, no clue how i managed to miss something that obvious... Post it as an answer if you want, i will accept it — FutureCake
– FutureCake, Commented Apr 13, 2021 at 20:51

Nadia Chibrikova · Accepted Answer · 2021-04-13 20:54:00Z

1

You have two functions returning void onSlideTransition and onTransitionComplete, so it should be onSlideTransition?: (slide: Slide, offset: number, onTransitionComplete: () => void)=> void;

answered Apr 13, 2021 at 20:54

Nadia Chibrikova

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