Function preprocess

packages/zod/src/v4/classic/schemas.ts:2663–2672

(
  fn: (arg: B, ctx: core.$RefinementCtx) => A,
  schema: U
)

// preprocess

export function preprocess<A, U extends core.SomeType, B = unknown>(
  fn: (arg: B, ctx: core.$RefinementCtx) => A,
  schema: U
): ZodPreprocess<U> {
  return new ZodPreprocess({
    type: "pipe",
    in: transform(fn as any) as any as core.$ZodTransform,
    out: schema as any as core.$ZodType,
  }) as any;
}