typescript 应在 function 类型声明中使用“=>”

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.

Answer 1

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