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zod

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TypeScript-first schema declaration and validation library with static type inference

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import { expect, expectTypeOf, test } from "vitest"; import * as z from "zod/v4"; test("z.stringbool", () => { const a = z.stringbool(); type a = z.infer<typeof a>; expectTypeOf<a>().toEqualTypeOf<boolean>(); type a_in = z.input<typeof a>; expectTypeOf<a_in>().toEqualTypeOf<string>(); expect(z.parse(a, "true")).toEqual(true); expect(z.parse(a, "yes")).toEqual(true); expect(z.parse(a, "1")).toEqual(true); expect(z.parse(a, "on")).toEqual(true); expect(z.parse(a, "y")).toEqual(true); expect(z.parse(a, "enabled")).toEqual(true); expect(z.parse(a, "TRUE")).toEqual(true); expect(z.parse(a, "false")).toEqual(false); expect(z.parse(a, "no")).toEqual(false); expect(z.parse(a, "0")).toEqual(false); expect(z.parse(a, "off")).toEqual(false); expect(z.parse(a, "n")).toEqual(false); expect(z.parse(a, "disabled")).toEqual(false); expect(z.parse(a, "FALSE")).toEqual(false); expect(z.safeParse(a, "other")).toMatchObject({ success: false }); expect(z.safeParse(a, "")).toMatchObject({ success: false }); expect(z.safeParse(a, undefined)).toMatchObject({ success: false }); expect(z.safeParse(a, {})).toMatchObject({ success: false }); expect(z.safeParse(a, true)).toMatchObject({ success: false }); expect(z.safeParse(a, false)).toMatchObject({ success: false }); }); test("custom values", () => { const b = z.stringbool({ truthy: ["y"], falsy: ["N"], }); expect(z.parse(b, "y")).toEqual(true); expect(z.parse(b, "Y")).toEqual(true); expect(z.parse(b, "n")).toEqual(false); expect(z.parse(b, "N")).toEqual(false); expect(z.safeParse(b, "true")).toMatchObject({ success: false }); expect(z.safeParse(b, "false")).toMatchObject({ success: false }); }); test("custom values - case sensitive", () => { const c = z.stringbool({ truthy: ["y"], falsy: ["N"], case: "sensitive", }); expect(z.parse(c, "y")).toEqual(true); expect(z.safeParse(c, "Y")).toMatchObject({ success: false }); expect(z.parse(c, "N")).toEqual(false); expect(z.safeParse(c, "n")).toMatchObject({ success: false }); expect(z.safeParse(c, "TRUE")).toMatchObject({ success: false }); }); // test custom error messages test("z.stringbool with custom error messages", () => { const a = z.stringbool("wrong!"); expect(() => a.parse("")).toThrowError("wrong!"); });