utils guards.ts

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  export function defined<T>(value: T): value is Exclude<T, undefined | null> {
  return value !== undefined && value !== null;
}
 
export function empty<T extends string | any[]>(value: T): value is Exclude<T, undefined | null> {
  return !defined(value) || (typeof value === 'string' ? value.trim().length === 0 : value.length === 0);
}