Does not handle single value unions

[anglinb]

Bug description

Typescript allows for single values unions like this. It simply collapses the union so to typescript this value is really just type A = B. ts-to-zod produces a union of a single element which zod does not allow, so validation fails.

type A = 
| B

Input

type A = | B

Expected output

export const aSchema = z.literal("b");

Actual output

export const aSchema = z.union([z.literal("b")]);

Versions

• Typescript: v4.2.3
• Zod: v3.1.0