gistfile1.txt

function decorateEntrySnippet<Additions, I>(someFunctionThatReturnsAdditions: () => Additions, toDecorate: (props: I) => void) {
    function inside(props: I & Additions) {
        return toDecorate(props);
    }
    return inside;
}

function EntrySnippet(props: {entry: Entry}): void {
    
}

const generateAdditions = () => {
    return {
        entry: 'Clearly this should not work',  
    };
}

const DecoratedEntrySnippet = decorateEntrySnippet(generateAdditions, EntrySnippet);

let myEntry: Entry = null;
let myMeal: Meal = null;

EntrySnippet({entry: myEntry})
DecoratedEntrySnippet({entry: myEntry})