Types inside a namespace disappear when the namespace is exported through HoC

[cdpark0530]

Bug Report

🔎 Search Terms

namespace disappear, namespace lost

🕗 Version & Regression Information

4.3.5
also tested: 3.9.10, 4.0.8, 4.1.6, 4.2, 4.4.3

• This is the behavior in every version I tried, and I reviewed the FAQ for entries about namespace

⏯ Playground Link

Couldn't use it as the issue occurs in a script importing another script.

💻 Code

// Child.tsx
import React from "react";

function Child(props: Child.Props) {
    return <>{props.name}</>;
}

namespace Child {
    export interface Props {
        name: string;
    }

    export const constant = "Hello, World!";
}

function hoc<C extends React.ComponentType<any>>(component: C) {
	return component;
}

export default hoc(Child);

// Parent.tsx
import Child from "./Child";

const constant = Child.constant; // Child.constant is visible
type childProps = Child.Props; // Child.Props is not visible

🙁 Actual behavior

Child.Props is not visible in Parent.tsx

🙂 Expected behavior

Child.Props is visible in Parent.tsx because I think it should be as Child.constant is visible in Parent.tsx.

[andrewbranch]

@DanielRosenwasser I know we’ve talked about this as a feature request before but I can’t for the life of me find anything to link it to. Tried searching for “function return namespace” but no luck.

[DanielRosenwasser]

I think any time we discuss namespaces being carried together with values, the feature is "associated types" which allow values' types to contain other types, effectively turning them into namespaces.

#17588

[andrewbranch]

I looked at that issue and even searched “associated types” but that particular proposal is so complicated that I felt like there must have been a simpler proposal to link to 😅

[typescript-bot]

This issue has been marked 'Working as Intended' and has seen no recent activity. It has been automatically closed for house-keeping purposes.