Enum / oneOf

Use enumOf() or .oneOf() to constrain a string or number to a fixed set of literal values. The inferred type narrows automatically.

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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.