[Design Pattern: A better Try-Catch] #JavaScript #Promise

index.ts

// Based on Theo - t3․gg suggestion and ZOD
// Youtube https://www.youtube.com/watch?v=Y6jT-IkV0VM&t=538s
// and gist https://gist.github.com/t3dotgg/a486c4ae66d32bf17c09c73609dacc5b


type Success<T> = {
    success: true
    data: T
    error?: never
}

type Failure<E> = {
    success: false
    data?: never
    error: E
};

type SafeResult<T, E = Error> = Success<T> | Failure<E>

export async function tryCatch<T, E = Error>(fn: Promise<T> | (() => T)): Promise<SafeResult<T, E>> {
    try {
        let data: T;
        if (typeof fn === 'function') {
            data = fn();
        } else {
            data = await fn;
        }
        return { data, success: true };
    } catch (error) {
        return { error: error as E, success: false };
    }
}