definedProps.ts

export type NonUndefinedKeys<T> = {
  [K in keyof T]-?: T[K] extends undefined ? never : K;
}[keyof T];

export function definedProps<T extends Record<string, any>>(obj: T): NonUndefinedKeys<T> {
  for (const key in obj) {
    if (obj[key] === undefined) {
      delete obj[key];
    }
  }

  return obj as unknown as NonUndefinedKeys<T>;
}