arktype

Patterns for composing discriminated unions with arktype's .merge() and .or() methods.

Use when you have shared base fields and per-variant payloads discriminated on a literal key. .merge() distributes over unions — it merges the base into each branch of the union automatically.

| Base is a real Type | Reusable, composable, inspectable at runtime | | .merge() distributes | No need to repeat base.merge(...) per variant | | type.or() is flat | All variants in one list — easy to read and add to | | Base appears once | DRY — change base fields in one place | | Auto-discrimination | No manual discriminant config needed |

使用 .merge() 和 .or()、扩展键语法和类型组合的可区分联合的 Arktype 模式。在构建联合类型、将基本模式与变体组合或使用 arktype 定义命令/事件模式时使用。 来源：epicenterhq/epicenter。