Function onNone

repos/effect/packages/effect/src/SchemaGetter.ts:334–338

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

 *
 * **Example** (Providing a default timestamp for a missing field)
 *
 * ```ts import.meta.vitest
 * import { Effect, Option, SchemaGetter } from "effect"
 *
 * const withTimestamp = SchemaGetter.onNone<number>(() =>
 *   Effect.succeed(Option.some(0))
 * )
 * await Effect.runPromise(withTimestamp.run(Option.none(), {})) // => Option.some(0)