`create` makes all properties optional

[alexeyraspopov]

`create` makes all properties optional

[alexeyraspopov]

I'm not sure if this is a feature or a bug: when I create a new instance of a dataclass through .create all class attributes have been made optional.

They are not "made optional". .create() receives a subset of fields, assuming that omitted keys will be using default values.

class User extends Data {
 name: string;
 age: number;
}

What version (or configuration) of TypeScript you're using? This code suppose to raise error of properties that have no initializer.

Prior to v2, optional fields were not explicitly supported because information about this fields was missing in runtime. Starting from v2 you can define name?: string which will provide string | undefined type, just like the signature suggests.

[mstykow]

What if I don't want to assign default values but want to require certain values to be provided on initialization/creation?

I looked into your source code. They way you've TS-declared the create method it makes all attributes optional here because you're using Partial. However, the fix is not that simple because there is no way to distinguish class properties from class methods in TypeScript. So if we were to remove Partial here the create method would also require all data class methods which are not part of the constructor.

Basically, to address this issue we'd have to rewrite your whole implementation. So we can just document this issue as a known limitation and close the issue.

[alexeyraspopov]

Please read through the docs, most likely your use case is not covered by the library.