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an array that is not empty - simple #689

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an array that is not empty - simple #689

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9 changes: 9 additions & 0 deletions packages/effect-app/src/Schema/ext.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -15,6 +15,15 @@ type ProvidedCodec<Self extends S.Top, R> = S.Codec<
Exclude<Self["EncodingServices"], R>
>

export const NonEmptyArrayAsTuple: typeof S.NonEmptyArray = S.NonEmptyArray
export type NonEmptyArrayAsTuple<ValueSchema extends S.Top> = S.NonEmptyArray<ValueSchema>

/**
* An array that is non empty. Non emptyness is confirmed on the container, not as the first element (unlike on tuples)
*/
export const NonEmptyArray = <ValueSchema extends S.Top>(valueSchema: ValueSchema) =>
S.Array(valueSchema).pipe(S.check(S.isMinLength(1)), S.decodeTo(S.toType(S.NonEmptyArray(valueSchema))))

// TODO: v4 migration - Date is no longer by default encoded to string.

const DateString = S.String.annotate({
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