Unverified50% confidenceFactExact time
In the JavaScript/TypeScript ecosystem, statements at the top level of a module such as const schema = z.object({...}) are synchronously evaluated at import time, constituting an import side effect.
1
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50%
Confidence
Long-term
Relevance
10/21/2026
First Seen
Sources
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Related Claims
UnverifiedJavaScript modules execute top-level code when imported; object construction and function calls at the module top level all happen synchronously at import time.66% similarUnverifiedSome compilers' internal logic relies on dynamic behavior of the JavaScript runtime (such as object property enumeration and eval-style evaluation) that cannot be precisely modeled at the pure type level.66% similarUnverifiedIn the JavaScript/TypeScript ecosystem, schema usually refers to an object used to describe and validate data structures, with common implementations including Zod, Valibot, and others.65% similarUnverifiedIn the JavaScript ecosystem, the same package may be installed in multiple copies due to different dependency trees, causing hidden problems such as type mismatches, failed instanceof checks, and reactive state that cannot interoperate.63% similarUnverifiedTypeScript validation libraries such as Zod can automatically convert TypeScript type definitions into JSON Schema, enabling a schema-first development model.60% similar
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