release: WRNexusJS 0.8.0

packages/validation/src/helpers.ts

@@ -0,0 +1,46 @@
+import type { ObjectSchema, ParseResult, SchemaDescriptor } from "./index.ts";
+
+export class ValidationError<T = Record<string, unknown>> extends Error {
+  constructor(public readonly result: ParseResult<T>) {
+    super("Validation failed");
+    this.name = "ValidationError";
+  }
+}
+
+export function parseOrThrow<T extends object>(schema: ObjectSchema<T>, input: unknown): T {
+  const result = schema.parse(input);
+  if (!result.ok) throw new ValidationError(result);
+  return result.value;
+}
+
+export function validationResponse(
+  result: ParseResult,
+  options: { successStatus?: number; failureStatus?: number } = {},
+): Response {
+  return Response.json(
+    result.ok
+      ? { ok: true, value: result.value }
+      : { ok: false, errors: result.errors, value: result.value },
+    {
+      status: result.ok ? (options.successStatus ?? 200) : (options.failureStatus ?? 422),
+      headers: { "cache-control": "no-store" },
+    },
+  );
+}
+
+export function firstValidationError(errors: Record<string, string>): string | null {
+  return Object.values(errors).find(Boolean) ?? null;
+}
+
+export function validationSummary(
+  errors: Record<string, string>,
+): Array<{ field: string; message: string }> {
+  return Object.entries(errors)
+    .filter(([, message]) => Boolean(message))
+    .map(([field, message]) => ({ field, message }));
+}
+
+export function schemaFieldNames(schema: ObjectSchema | SchemaDescriptor): string[] {
+  const descriptor = "describe" in schema ? schema.describe() : schema;
+  return Object.keys(descriptor.fields);
+}