Function failure

packages/effect/src/Optic.ts:1550–1556

()

 * @since 4.0.0
 */
export function failure<A, E>(): Prism<Result.Result<A, E>, E> {
  const run = runRefinement(Result.isFailure, { expected: "a Result.Failure value" })
  return makePrism(
    (s) => Result.map(run(s), (s) => s.failure),
    Result.fail
  )
}

function runRefinement<T extends E, E>(
  refinement: (e: E) => e is T,