Zod with Temporal

main.ts

import "./temporal-polyfill.js";
import * as z from "zod";
import * as zt from "zod-temporal";

interface TimeSchemas {
  Instant: z.Schema;
  LocalDateTime: z.Schema;
}

const isoSchemas = {
  Instant: z.iso.datetime({ offset: false }),
  LocalDateTime: z.iso.datetime({ local: true }),
} satisfies TimeSchemas;

const temporalSchemas = {
  Instant: zt.instant(),
  LocalDateTime: zt.plainDateTime(),
} satisfies TimeSchemas;

const makeUserSchema = <TimeSchemasT extends TimeSchemas>(
  timeSchemas: TimeSchemasT,
) =>
  z.object({
    joinedAt: timeSchemas.Instant,
    joinedAtLocal: timeSchemas.LocalDateTime,
  });

const SerializableUserSchema = makeUserSchema(isoSchemas);

const UserSchema = makeUserSchema(temporalSchemas);

const user = SerializableUserSchema.parse({
  joinedAt: "2024-06-01T12:00:00Z",
  joinedAtLocal: "2024-06-01T14:00",
});

const temporalUser = UserSchema.decode(user);
console.log("Decoded user2:", temporalUser);

package.json

{
  "name": "workspace",
  "version": "1.0.0",
  "description": "",
  "main": "index.js",
  "scripts": {
    "test": "echo \"Error: no test specified\" && exit 1"
  },
  "keywords": [],
  "author": "",
  "license": "ISC",
  "type": "module",
  "dependencies": {
    "@js-temporal/polyfill": "^0.5.1",
    "zod": "^4.3.6",
    "zod-temporal": "^2.1.1"
  },
  "devDependencies": {
    "@types/node": "^25.3.3",
    "tsx": "^4.21.0",
    "typescript": "^5.9.3"
  }
}

temporal-polyfill.js

import { Temporal } from "@js-temporal/polyfill";
(globalThis as any).Temporal = Temporal;
export {};

tsconfig.json

{
  // Visit https://aka.ms/tsconfig to read more about this file
  "compilerOptions": {
    // File Layout
    // "rootDir": "./src",
    // "outDir": "./dist",

    // Environment Settings
    // See also https://aka.ms/tsconfig/module
    "module": "nodenext",
    "moduleResolution": "nodenext",
    "target": "esnext",
    "types": ["node"],
    // For nodejs:
    // "lib": ["esnext"],
    // "types": ["node"],
    // and npm install -D @types/node

    // Other Outputs
    "sourceMap": true,
    "declaration": true,
    "declarationMap": true,

    // Stricter Typechecking Options
    "noUncheckedIndexedAccess": true,
    "exactOptionalPropertyTypes": true,

    // Style Options
    // "noImplicitReturns": true,
    // "noImplicitOverride": true,
    // "noUnusedLocals": true,
    // "noUnusedParameters": true,
    // "noFallthroughCasesInSwitch": true,
    // "noPropertyAccessFromIndexSignature": true,

    // Recommended Options
    "strict": true,
    "jsx": "react-jsx",
    "verbatimModuleSyntax": true,
    "isolatedModules": true,
    "noUncheckedSideEffectImports": true,
    "moduleDetection": "force",
    "skipLibCheck": true,
  }
}