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Higher order type inference from generic React component #30650

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@OliverJAsh

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@OliverJAsh

TypeScript Version: 3.4.1

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interface Component<P> {
    (props: P): unknown;
    // Comment this out and it works
    defaultProps?: Partial<P>;
}
declare function myHoc<Props>(C: Component<Props>): Component<Props>;

type Props<T> = { t: T; foo: number };
declare function MyComponent<T>(props: Props<T>): unknown;
// Expected type: <T>(props: Props<T>) => unknown
// Actual type: Component<Props<{}>>
const MyComponent2 = myHoc(MyComponent);

// Workaround: assert the resulting type
const MyComponent3 = myHoc(MyComponent) as typeof MyComponent;

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