github colinhacks/zod v3.22.0
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latest releases: v3.23.8, v3.23.7, v3.23.6...
15 months ago

ZodReadonly

This release introduces ZodReadonly and the .readonly() method on ZodType.

Calling .readonly() on any schema returns a ZodReadonly instance that wraps the original schema. The new schema parses all inputs using the original schema, then calls Object.freeze() on the result. The inferred type is also marked as readonly. 

const schema = z.object({ name: string }).readonly();
type schema = z.infer<typeof schema>;
// Readonly<{name: string}>

const result = schema.parse({ name: "fido" });
result.name = "simba"; // error

The inferred type uses TypeScript's built-in readonly types when relevant. 

z.array(z.string()).readonly();
// readonly string[]

z.tuple([z.string(), z.number()]).readonly();
// readonly [string, number]

z.map(z.string(), z.date()).readonly();
// ReadonlyMap<string, Date>

z.set(z.string()).readonly();
// ReadonlySet<Promise<string>>

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