Feedback on TypeScript Code Using Effect Library for Schema Transformation

enum InputEventType {
  D = 'D',
  E = 'E',
  F = 'F'
}

enum EventType {
  MloEvent = 'MloEvent',
  DealEvent = 'DealEvent',
  BloEvent = 'BloEvent'
}

const InputSchema = Schema.Struct({
  Header: Schema.Struct({
    MsgType: Schema.String,
  }),
  Body: Schema.Struct({
    foo: Schema.String,
  }),
  Trailer: Schema.Struct({}),
});

const OutputSchema = Schema.Struct({
  EventType: Schema.Enums(EventType),
  Body: Schema.Struct({
    foo: Schema.String,
  }),
});

const TransformedSchema = Schema.transform(
  InputSchema,
  OutputSchema,
  {
    strict: true,
    decode: (input) => {
      const typeMap = { D: EventType.MloEvent, E: EventType.DealEvent, F: EventType.BloEvent }
      return {
        EventType: typeMap[input.Header.MsgType as InputEventType],
        Body: input.Body,
      }
    },
    encode: (output) => {
      const reverseTypeMap = { MloEvent: InputEventType.D, DealEvent: InputEventType.E, BloEvent: InputEventType.F }
      return {
        Header: { MsgType: reverseTypeMap[output.EventType] },
        Body: output.Body,
        Trailer: {},
      }
    }
  }
)

const messageDecoded = Schema.decode(TransformedSchema)({
    Header: { MsgType: "D" },
    Body: { foo: "foo" },
    Trailer: {},
  })