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fix: check if Union type is optional during Encode #782

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3 changes: 3 additions & 0 deletions src/value/transform/encode.ts
Expand Up @@ -171,6 +171,9 @@ function FromTuple(schema: TTuple, references: TSchema[], value: any) {
}
// prettier-ignore
function FromUnion(schema: TUnion, references: TSchema[], value: any) {
if (IsOptional(schema) && value === undefined) {
return undefined
}
// test value against union variants
for (const subschema of schema.anyOf) {
if (!Check(subschema, references, value)) continue
Expand Down