Prefer union string literals (or `as const`) over `enum` | BeforeMerge Rules | BeforeMerge

Prefer union string literals (or `as const`) over `enum` | BeforeMerge Rules | BeforeMerge

Why this matters

String-literal unions are type-only (zero runtime footprint), narrow cleanly, and avoid the well-known footguns of numeric enums.

// Bad
enum Role { Admin, User, Guest }
 
// Good
type Role = "admin" | "user" | "guest";
const ROLES = ["admin", "user", "guest"] as const;
type Role2 = (typeof ROLES)[number];