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kerosene-ui: Make UnwrapComponent utlity type actually recursive #71

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Merged
merged 2 commits into from
Jun 9, 2020
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kerosene-ui: Make UnwrapComponent utlity type actually recursive #71

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6075659
kerosene-ui: Make the UnwrapComponent utility type actually recursive
nhardy May 13, 2020
c911a81
kerosene-ui: Bump version
nhardy Jun 8, 2020
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2 changes: 1 addition & 1 deletion packages/kerosene-ui/package.json
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Original file line number Diff line number Diff line change
@@ -1,6 +1,6 @@
{
"name": "@kablamo/kerosene-ui",
"version": "0.0.16",
"version": "0.0.17",
"repository": "https://github.com/KablamoOSS/kerosene/tree/master/packages/kerosene-ui",
"bugs": {
"url": "https://github.com/KablamoOSS/kerosene/issues"
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41 changes: 14 additions & 27 deletions packages/kerosene-ui/src/types/index.ts
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Original file line number Diff line number Diff line change
@@ -1,34 +1,21 @@
/**
* Used internally by `UnwrapComponent<T>` to unwrap a single layer decorator-wrapped component
* @private
* Unwraps the decorated typings from a decorator-wrapped components to provide the original type of the underlying
* component. Useful in unit testing when stubbing decorators with the identity function.
*/
export type _UnwrapComponent<T> = T extends React.MemoExoticComponent<
export type UnwrapComponent<T> = T extends React.MemoExoticComponent<
infer TMemoComponent
>
? TMemoComponent
? { 0: UnwrapComponent<TMemoComponent> }[TMemoComponent extends any
? 0
: never]
: T extends React.LazyExoticComponent<infer TLazyComponent>
? TLazyComponent
? { 0: UnwrapComponent<TLazyComponent> }[TLazyComponent extends any
? 0
: never]
: "WrappedComponent" extends keyof T
// @ts-ignore
? T["WrappedComponent"]
? {
// @ts-ignore
0: UnwrapComponent<T["WrappedComponent"]>;
// @ts-ignore
}[T["WrappedComponent"] extends any ? 0 : never]
: T;

/**
* Unwraps the decorated typings from a decorator-wrapped components to provide the original type of the underlying
* component. Useful in unit testing when stubbing decorators with the identity function.
*
* Note: This will unwrap up to 8 layers of decorators as although TypeScript supports recursive types, it does not
* allow recursive type arguments. If more levels are required, you may use the `_UnwrapComponent<T>` type to unwrap
* a single layer at a time.
*/
export type UnwrapComponent<T> = _UnwrapComponent<
_UnwrapComponent<
_UnwrapComponent<
_UnwrapComponent<
_UnwrapComponent<
_UnwrapComponent<_UnwrapComponent<_UnwrapComponent<T>>>
>
>
>
>
>;