Function compose

repos/effect/packages/effect/src/Optic.ts:440–453

(a: Node, b: Node)

 *
 * @see {@link makeOptional} — constructor
 * @see {@link Lens} — when reading always succeeds
 * @see {@link Prism} — when writing always succeeds
 *
 * @category models
 * @since 4.0.0
 */
export interface Optional<in out S, in out A> {
  /**
   * Attempts to read the focus `A` from the whole `S`. Returns
   * `Result.Success<A>` when the focus exists, or
   * `Result.Failure<SchemaIssue.Issue>` with a structured issue otherwise.
   */
  readonly getResult: (s: S) => Result.Result<A, SchemaIssue.Issue>
  /**
   * Replaces the focus in `S` with a new `A`. Returns the original `s`
   * unchanged when the optic cannot focus (never throws).
   */