strictNullChecks=false makes z.object() properties optional

[AndrewSmir]

Hi!

Turning off strictNullChecks in compilerOptions makes all object properties optional.

tsc -v: 4.9.5

tsconfig:

{
  "compilerOptions": {
    "strictNullChecks": false,
    "strict": true,
  }
}

Example:

const Dog = z.object({
  name: z.string(),
  age: z.number(),
});

type Dog = z.infer<typeof Dog>;

Expected result:
// equivalent to:

type Dog = {
  name: string;
  age: number;
};

Actual result:
// equivalent to:

type Dog = {
  name?: string;
  age?: number;
};

[JacobWeisenburger]

https://github.com/colinhacks/zod#requirements

You must enable strict mode in your tsconfig.json. This is a best practice for all TypeScript projects.

if you disable strictNullChecks, then you are disabling part of strict mode which is required for zod to work correctly.