Infered type from schema made everything optional

[PointSingularity]

So I was just playing around with zod, and created an empty project just with zod installed.

Here is my only file

// main.ts

import { z } from 'zod';

const dataSchema = z.object({
  firstName: z.string().min(2),
  lastName: z.string().optional(),
  email: z.string().email(),
  phoneNumber: z.string().min(10).optional(),
});

type dataType = z.infer<typeof dataSchema>;

const data: dataType = {};

dataSchema.parse(data);

But as you can see on the image the type is inferred with all properties being optional.
On the other hand, if I execute the code I do get an error:

TSError: ⨯ Unable to compile TypeScript:
main.ts:12:7 - error TS2739: Type '{}' is missing the following properties from type '{ lastName?: string | undefined; phoneNumber?: string | undefined; firstName: string; email: string; }': firstName, email

12 const data: dataType = {};

And here is the complete stack trace from the tsc compiled js file:

Stack Trace

D:\wd2\zod-test\node_modules\zod\lib\types.js:123
throw result.error;
^

ZodError: [
{
"code": "invalid_type",
"expected": "string",
"received": "undefined",
"path": [
"firstName"
],
"message": "Required"
},
{
"code": "invalid_type",
"expected": "string",
"received": "undefined",
"path": [
"email"
],
"message": "Required"
}
]
at handleResult (D:\wd2\zod-test\node_modules\zod\lib\types.js:28:23)
at ZodObject.safeParse (D:\wd2\zod-test\node_modules\zod\lib\types.js:140:16)
at ZodObject.parse (D:\wd2\zod-test\node_modules\zod\lib\types.js:120:29)
at Object. (D:\wd2\zod-test\main.js:11:12)
at Module._compile (node:internal/modules/cjs/loader:1105:14)
at Module._extensions..js (node:internal/modules/cjs/loader:1159:10)
at Module.load (node:internal/modules/cjs/loader:981:32)
at Module._load (node:internal/modules/cjs/loader:827:12)
at Function.executeUserEntryPoint [as runMain] (node:internal/modules/run_main:77:12)
at node:internal/main/run_main_module:17:47 {
issues: [
{
code: 'invalid_type',
expected: 'string',
received: 'undefined',
path: [ 'firstName' ],
message: 'Required'
},
{
code: 'invalid_type',
expected: 'string',
received: 'undefined',
path: [ 'email' ],
message: 'Required'
}
],
addIssue: [Function (anonymous)],
addIssues: [Function (anonymous)]
}

Any insight would be greatly appreciated.

[scotttrinh]

You need to ensure your tsconfig specifies strict: true

[PointSingularity]

This was it, and it was in the README too.
I need to learn to read more thoroughly 😅

Thank you for the quick answer!

[scotttrinh]

Don't feel too bad, we get this same question about once a week! 😅