Compatibility with inferred types from zod

[matt-pawley]

Hi, our codebase for various reasons has a mix of zod types and typescript types.

We are hoping to generate JSON schema from the typescript types (which in turn use inferred zod types). However upon trying we get the following error TypeError: Cannot read property 'types' of undefined which is thrown here

A minimal reproducible example is below:

// foo.ts

import * as zod from 'zod';

const Foo = zod.number();
type FooType = zod.infer<typeof Foo>;

export interface Example {
  foo: FooType;
}

Can be ran with npx ts-json-schema-generator --path ./foo.ts --type Example

Appreciate this is probably out of the remit of this library, but would it be something you would be open to having a PR for? If so, could point me in the right direction to fix ?

[domoritz]

Thanks for the issue. To debug this, I suggest inlining
The types. Then use the debugger to get a stack trace and see where the error is thrown. Yes, I'm happy about prs!

[zmk-punchbowl]

@matt-pawley we're running into a similar issue (using https://github.com/env0/serverless-openapi-typescript). Did you end up finding a way forward?

This is the error we're getting when a type that uses zod infer is encountered. In this case types is the property that is undefined.

TypeError: Cannot read properties of undefined (reading 'map')
    at CallExpressionParser.createType (.../node_modules/ts-json-schema-generator/dist/src/NodeParser/CallExpressionParser.js:25:71)

[timothympace]

I also ran into this and found a fix for the problem: #1947

I don't understand the purpose of the FIXME in the first place, but it seems like a good idea to fully validate the type before trying to use methods that might not exist.