Optional arrays are not marked optional in Zod schema

[LaCuneta]

Bug description

If I have a type with an optional array of items, the result in the Zod schema is not marked optional(). A validation error is generated:

✖ Validating generated types
 ›   Error: 'A' is not compatible with 'aSchema':
 ›   Argument of type 'A' is not assignable to parameter of type '{ values: string[]; }'.
 ›     Types of property 'values' are incompatible.
 ›       Type 'string[] | undefined' is not assignable to type 'string[]'.
 ›         Type 'undefined' is not assignable to type 'string[]'.
error Command failed with exit code 2.

Input

// typescript type or interface causing the output
export type A = {
  values?: Array<string>
}

Expected output

// Generated by ts-to-zod
import { z } from "zod";

export const aSchema = z.object({
  values: z.array(z.string()).optional(),
});

Actual output

// Actual Zod schemas
// Generated by ts-to-zod
import { z } from "zod";

export const aSchema = z.object({
  values: z.array(z.string()),
});

Versions

• ts-to-zod: v1.0.1
• Typescript: v4.2.3
• Zod: v3.0.0-alpha.39

[fabien0102]

Good catch! Thanks for the report!