Typensichere bitweise Maskengenerierung für hochperformante Audit-Protokolle

type FlagBitmask<N extends number> = number & { readonly __brand: N };
 
enum AuditFlags {
  READ = 1 << 0,
  WRITE = 1 << 1,
  DELETE = 1 << 2,
  ADMIN = 1 << 3,
}
 
function combineFlags<F extends AuditFlags[]>(...flags: F): FlagBitmask<number> {
  return flags.reduce((acc, flag) => acc | flag, 0) as FlagBitmask<number>;
}
 
function hasPermission(mask: FlagBitmask<number>, flag: AuditFlags): boolean {
  return (mask & flag) === flag;
}