Function onNone

packages/effect/src/SchemaGetter.ts:351–355

(
  f: (options: SchemaAST.ParseOptions) => Effect.Effect<Option.Option<T>, SchemaIssue.Issue, R>
)

 * @since 4.0.0
 */
export function onNone<T, E extends T = T, R = never>(
  f: (options: SchemaAST.ParseOptions) => Effect.Effect<Option.Option<T>, SchemaIssue.Issue, R>
): Getter<T, E, R> {
  return new Getter((ot, options) => Option.isNone(ot) ? f(options) : Effect.succeed(ot))
}

/**
 * Creates a getter that fails with `MissingKey` if the input is absent (`Option.None`).