Readonly Modifier

Use .readonly() to mark a schema's inferred type as immutable. This is type-level only — validation behaviour is unchanged, but TypeScript will enforce immutability.

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Assign a validation result to a variable to see output here, e.g. const result = schema.validate(data)
Inferred Type

Define a schema to see its inferred TypeScript type.

InferType<typeof schema> automatically derives the TypeScript type from your schema definition.