usefull small utils for TS

ts-utils.ts

export function notEmpty<TValue>(
    value: TValue | null | undefined
): value is TValue {
    return value !== null && value !== undefined;
}

export type Maybe<T> = null | undefined | T;

export function filterMaybeArrayMaybe<T>(array: Maybe<Maybe<T>[]>) {
    if (array === null || array === undefined) {
        return [];
    }
    return array.filter(notEmpty);
}