Creating a Type-Safe Transform Helper to Add Tags to Schemas in TypeScript

I'm trying to write a generic transform helper that will add a

_tag

_tag

to a Schema, any tips on getting the types working? https://effect.website/play#f5fb1abeaecb

const withTag = (tag: string) => <Fields extends S.Struct.Fields>(from: S.Struct<Fields>) => S.transform(
  S.Struct({ ...from.fields, _tag: S.tag(tag) }),
  {
    decode: (x) => ({ ...x, _tag: tag }),
    encode: ({ _tag: _, ...rest }) => rest
  }
)

const withTag = (tag: string) => <Fields extends S.Struct.Fields>(from: S.Struct<Fields>) => S.transform(
  S.Struct({ ...from.fields, _tag: S.tag(tag) }),
  {
    decode: (x) => ({ ...x, _tag: tag }),
    encode: ({ _tag: _, ...rest }) => rest
  }
)

Effect Community•2y ago

johtso

Creating a Type-Safe Transform Helper to Add Tags to Schemas in TypeScript

I'm trying to write a generic transform helper that will add a

_tag

_tag

to a Schema, any tips on getting the types working? https://effect.website/play#f5fb1abeaecb

const withTag = (tag: string) => <Fields extends S.Struct.Fields>(from: S.Struct<Fields>) => S.transform(
  S.Struct({ ...from.fields, _tag: S.tag(tag) }),
  {
    decode: (x) => ({ ...x, _tag: tag }),
    encode: ({ _tag: _, ...rest }) => rest
  }
)

const withTag = (tag: string) => <Fields extends S.Struct.Fields>(from: S.Struct<Fields>) => S.transform(
  S.Struct({ ...from.fields, _tag: S.tag(tag) }),
  {
    decode: (x) => ({ ...x, _tag: tag }),
    encode: ({ _tag: _, ...rest }) => rest
  }
)

Creating a Type-Safe Transform Helper to Add Tags to Schemas in TypeScript

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