Typescript strongly type void Function

I'm trying to write an interface which takes a function in as a parameter:

Currently I'm trying this

export interface EditOptions {
isEditing: boolean;
save: () => {};
}


I've tried a few things to assign the function:

editOptions: EditOptions = { isEditing: false, save: this.save };
editOptions: EditOptions = { isEditing: false, save: () => { this.save() } };


Neither work instead I receive this error:



I Know that for now I can use :any but what is the proper way to strongly type a void function

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