Function isOptional

src/cli/schema-to-yargs.ts:95–112

* Check if a Zod type is optional/nullable/has default.

(t: z.ZodType)

 * Check if a Zod type is optional/nullable/has default.
 */
function isOptional(t: z.ZodType): boolean {
  const typeName = getZodTypeName(t);

  if (
    typeName === 'optional' ||
    typeName === 'nullable' ||
    typeName === 'default' ||
    typeName === 'prefault'
  ) {
    return true;
  }

  // Check wrapper types recursively
  const inner = getInnerType(t);
  if (inner) return isOptional(inner);

  return false;
}

/**
 * Get description from a Zod type if available.