Out of memory error when inintializing a merged type with a lot of or

[floratmin]

Report a bug

When I create a complex type, I get out-of-memory errors when initializing the type. This example also crashes the ArkType playground. I like this project very much, but unfortunately the initialization times are a real deal-breaker for using ArkType in Cloudflare Workers. Once initialized, the validation is super fast.

🔎 Search Terms

Out of memory
Memory leak

🧩 Context

• ArkType version: 2.2.3
• TypeScript version (5.1+): 5.9.3
• Other context you think may be relevant (JS flavor, OS, etc.): Node 24.12.0

🧑‍💻 Repro

Playground Link: https://arktype.io/playground

    const Type1 = type({foo1: 'string', bar1: 'string'}).or({foo1: 'null', bar1: 'null'});
    const Type2 = type({foo2: 'string', bar2: 'string'}).or({foo2: 'null', bar2: 'null'});
    const Type3 = type({foo3: 'string', bar3: 'string'}).or({foo3: 'null', bar3: 'null'});
    const Type4 = type({foo4: 'string', bar4: 'string'}).or({foo4: 'null', bar4: 'null'});
    const Type5 = type({foo5: 'string', bar5: 'string'}).or({foo5: 'null', bar5: 'null'});
    const Type6 = type({foo6: 'string', bar6: 'string'}).or({foo6: 'null', bar6: 'null'});
    const Type7 = type({foo7: 'string', bar7: 'string'}).or({foo7: 'null', bar7: 'null'});
    const Type8 = type({foo8: 'string', bar8: 'string'}).or({foo8: 'null', bar8: 'null'});
    const Type9 = type({foo9: 'string', bar9: 'string'}).or({foo9: 'null', bar9: 'null'});
    const Type10 = type({foo10: 'string', bar10: 'string'}).or({foo10: 'null', bar10: 'null'});
    const Type11 = type({foo11: 'string', bar11: 'string'}).or({foo11: 'null', bar11: 'null'});
    const merged = Type1
      .merge(Type2)
      .merge(Type3)
      .merge(Type4)
      .merge(Type5)
      .merge(Type6)
      .merge(Type7)
      .merge(Type8)
      .merge(Type9)
      .merge(Type10)
      .merge(Type11);

[pullfrog]

  ^{｜ Build this ➔ ｜ Make a plan ➔}