Default enum generic

[codenothing]

If you have existing string union types, enum requires both generics to be defined in order to type guard against the input. Example:

import { z } from 'zod';

type TColors = 'Red' | 'Green' | 'Blue';

// Type error
z.enum<TColors>(["Red", "Green", "Blue"]);

// Success
z.enum<TColors, [TColors, ...TColors[]]>(["Red", "Green", "Blue"]);

To get around this, the createZodEnum overrides need a default generic for the second parameter

function createZodEnum<U extends string, T extends Readonly<[U, ...U[]]> = Readonly<[U, ...U[]]>>(
  values: T,
  params?: RawCreateParams
): ZodEnum<Writeable<T>>;
function createZodEnum<U extends string, T extends [U, ...U[]] = [U, ...U[]]>(
  values: T,
  params?: RawCreateParams
): ZodEnum<T>;