Function return type in typescript can be defined using a colon

Within a module, I have this function declaration:

declare module 'picoapp' {
  export function component(node?: HTMLElement): void
}

Later on, I am using it in a .ts file like this:

export default component((node: HTMLElement) => {
   // Various TS/JS code here
})

I encountered a warning in VSCode saying:

Argument of type '(node: HTMLElement) => void' is not assignable to parameter of type 'HTMLElement'
.

The question arises about the return type of the function. What should it be? I am not returning a value, just utilizing the node as a reference.

Answer №1

When utilizing your component function, it is essential to declare the type accordingly, with the callback parameter being any name of your choice.

declare module 'picoapp' {
    export function component(callback:(node?: HTMLElement)=>void): void
}

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