Method at

packages/effect/src/Optic.ts:1037–1059

(key: PropertyKey, ..._rest: Array<any>)

    )
  }
  at(key: PropertyKey, ..._rest: Array<any>): any {
    const err = Result.fail(
      new SchemaIssue.Pointer([key], new SchemaIssue.MissingKey(undefined))
    )
    return make(
      compose(
        this.node,
        primitiveNode(
          "Optional",
          (s) => Object.hasOwn(s, key) ? Result.succeed(s[key]) : err,
          (a, s) => {
            if (Object.hasOwn(s, key)) {
              const copy = cloneShallow(s)
              InternalRecord.assignProperty(copy, key, a)
              return Result.succeed(copy)
            } else {
              return err
            }
          }
        )
      )
    )
  }
  pick(keys: any) {
    return this.compose(makeLens(Struct.pick(keys), (p, a) => ({ ...a, ...p })))
  }