wip

src/lib/server-validator.ts

@@ -0,0 +1,17 @@
+import type { z, ZodType } from 'zod'
+
+// `createServerFn().validator(schema)` passes a zod schema straight through to
+// TanStack Start, which on failure throws `new Error(JSON.stringify(issues))` —
+// the raw issue array, not a message meant for a user to read. Wrapping the
+// schema in a plain function (`.validator(zodValidator(schema))`) routes
+// validation through this instead, so a rejected field surfaces its own zod
+// `.message` (e.g. "Enter a valid phone number") rather than a JSON blob.
+export function zodValidator<Schema extends ZodType>(schema: Schema) {
+  return (input: unknown): z.infer<Schema> => {
+    const result = schema.safeParse(input)
+    if (!result.success) {
+      throw new Error(result.error.issues[0]?.message ?? 'Invalid input')
+    }
+    return result.data
+  }
+}