Function getPartialUser

backend/src/dal/user.ts:265–281

(
  uid: string,
  stack: string,
  fields: K[],
)

 * @throws MonkeyError if user does not exist
 */
export async function getPartialUser<K extends keyof DBUser>(
  uid: string,
  stack: string,
  fields: K[],
): Promise<Pick<DBUser, K>> {
  const projection = new Map(fields.map((it) => [it, 1]));
  const partialUser = await getUsersCollection().findOne(
    { uid },
    { projection },
  );
  if (partialUser === null) throw new MonkeyError(404, "User not found", stack);

  if (fields.includes("personalBests" as K)) {
    return migrateUser(partialUser);
  }
  return partialUser;
}

export async function findByName(name: string): Promise<DBUser | undefined> {
  const found = await getUsersCollection().findOne(