From 8f943abc72abb89f35b3cd6d2a57781106cef1b5 Mon Sep 17 00:00:00 2001
From: Alexey Taktarov <molefrog@gmail.com>
Date: Thu, 3 Nov 2022 10:24:33 +0100
Subject: [PATCH] Less strict children type in Switch.

---
 types/ts3.9.4/index.d.ts     | 17 ++++-----
 types/ts3.9.4/type-specs.tsx | 28 +++++++++------
 types/ts4.1/index.d.ts       | 68 +++++++++++++++---------------------
 types/ts4.1/type-specs.tsx   | 36 ++++++++++---------
 4 files changed, 73 insertions(+), 76 deletions(-)

diff --git a/types/ts3.9.4/index.d.ts b/types/ts3.9.4/index.d.ts
index 540046da..cf6e9efd 100644
--- a/types/ts3.9.4/index.d.ts
+++ b/types/ts3.9.4/index.d.ts
@@ -57,10 +57,9 @@ export type LinkProps<H extends BaseLocationHook = LocationHook> = Omit<
 > &
   NavigationalProps<H>;
 
-export type RedirectProps<H extends BaseLocationHook = LocationHook> =
-  NavigationalProps<H> & {
-    children?: never;
-  };
+export type RedirectProps<H extends BaseLocationHook = LocationHook> = NavigationalProps<H> & {
+  children?: never;
+};
 
 export function Redirect<H extends BaseLocationHook = LocationHook>(
   props: PropsWithChildren<RedirectProps<H>>,
@@ -78,7 +77,7 @@ export function Link<H extends BaseLocationHook = LocationHook>(
 
 export interface SwitchProps {
   location?: string;
-  children: Array<ReactElement<RouteProps>>;
+  children: ReactNode;
 }
 export const Switch: FunctionComponent<SwitchProps>;
 
@@ -103,12 +102,8 @@ export const Router: FunctionComponent<
 
 export function useRouter(): RouterProps;
 
-export function useRoute<T extends DefaultParams = DefaultParams>(
-  pattern: Path
-): Match<T>;
+export function useRoute<T extends DefaultParams = DefaultParams>(pattern: Path): Match<T>;
 
-export function useLocation<
-  H extends BaseLocationHook = LocationHook
->(): HookReturnValue<H>;
+export function useLocation<H extends BaseLocationHook = LocationHook>(): HookReturnValue<H>;
 
 // tslint:enable:no-unnecessary-generics
diff --git a/types/ts3.9.4/type-specs.tsx b/types/ts3.9.4/type-specs.tsx
index 502944dc..0872cd3a 100644
--- a/types/ts3.9.4/type-specs.tsx
+++ b/types/ts3.9.4/type-specs.tsx
@@ -62,15 +62,11 @@ const invalidParamsWithGeneric: Params<{ id: number }> = { id: 13 }; // $ExpectE
   This is a <b>mixed</b> content
 </Route>;
 
-<Route path="/users/:id">
-  {(params: Params): React.ReactNode => `User id: ${params.id}`}
-</Route>;
+<Route path="/users/:id">{(params: Params): React.ReactNode => `User id: ${params.id}`}</Route>;
 
 <Route<{ id: string }> path="/users/:id">{({ id }) => `User id: ${id}`}</Route>;
 
-<Route<{ id: string }> path="/users/:id">
-  {({ age }) => `User age: ${age}`} // $ExpectError
-</Route>;
+<Route<{ id: string }> path="/users/:id">{({ age }) => `User age: ${age}`}</Route>; // $ExpectError
 
 <Route path="/app" match={true} />; // $ExpectError
 
@@ -128,10 +124,7 @@ const invalidParamsWithGeneric: Params<{ id: number }> = { id: 13 }; // $ExpectE
 
 Redirect<UseNetworkLocation>({ href: "/home", delay: 1000 });
 // example custom hook
-type UseLocWithNoOptions = () => [
-  string,
-  (to: string, foo: number, bar: string) => void
-];
+type UseLocWithNoOptions = () => [string, (to: string, foo: number, bar: string) => void];
 Redirect<UseLocWithNoOptions>({ href: "/app" });
 
 <Redirect>something</Redirect>; // $ExpectError
@@ -150,6 +143,21 @@ Redirect<UseLocWithNoOptions>({ href: "/app" });
   <Route />
 </Switch>;
 
+<Switch>
+  This won't be rendered, but it's allowed
+  <Route path="/app/users" />
+  <>
+    <div />
+    I'm a fragment
+  </>
+  {false && <a>Conditionals</a>}
+  {null}
+  {undefined}
+  <Route />
+</Switch>;
+
+<Switch />; // $ExpectError
+
 /*
  * Router specs
  */
diff --git a/types/ts4.1/index.d.ts b/types/ts4.1/index.d.ts
index 259943c9..1e3e9a51 100644
--- a/types/ts4.1/index.d.ts
+++ b/types/ts4.1/index.d.ts
@@ -1,4 +1,5 @@
 // Minimum TypeScript Version: 4.1
+
 // tslint:disable:no-unnecessary-generics
 
 import {
@@ -19,33 +20,31 @@ import {
 } from "../use-location";
 
 import { DefaultParams, Params, Match, MatcherFn } from "../matcher";
+import React = require("react");
 
 // re-export types from these modules
 export * from "../matcher";
 export * from "../use-location";
 
-export type ExtractRouteOptionalParam<PathType extends Path> =
-  PathType extends `${infer Param}?`
-    ? { [k in Param]: string | undefined }
-    : PathType extends `${infer Param}*`
-    ? { [k in Param]: string | undefined }
-    : PathType extends `${infer Param}+`
-    ? { [k in Param]: string }
-    : { [k in PathType]: string };
-
-export type ExtractRouteParams<PathType extends string> =
-  string extends PathType
-    ? { [k in string]: string }
-    : PathType extends `${infer _Start}:${infer ParamWithOptionalRegExp}/${infer Rest}`
-    ? ParamWithOptionalRegExp extends `${infer Param}(${infer _RegExp})`
-      ? ExtractRouteOptionalParam<Param> & ExtractRouteParams<Rest>
-      : ExtractRouteOptionalParam<ParamWithOptionalRegExp> &
-          ExtractRouteParams<Rest>
-    : PathType extends `${infer _Start}:${infer ParamWithOptionalRegExp}`
-    ? ParamWithOptionalRegExp extends `${infer Param}(${infer _RegExp})`
-      ? ExtractRouteOptionalParam<Param>
-      : ExtractRouteOptionalParam<ParamWithOptionalRegExp>
-    : {};
+export type ExtractRouteOptionalParam<PathType extends Path> = PathType extends `${infer Param}?`
+  ? { [k in Param]: string | undefined }
+  : PathType extends `${infer Param}*`
+  ? { [k in Param]: string | undefined }
+  : PathType extends `${infer Param}+`
+  ? { [k in Param]: string }
+  : { [k in PathType]: string };
+
+export type ExtractRouteParams<PathType extends string> = string extends PathType
+  ? { [k in string]: string }
+  : PathType extends `${infer _Start}:${infer ParamWithOptionalRegExp}/${infer Rest}`
+  ? ParamWithOptionalRegExp extends `${infer Param}(${infer _RegExp})`
+    ? ExtractRouteOptionalParam<Param> & ExtractRouteParams<Rest>
+    : ExtractRouteOptionalParam<ParamWithOptionalRegExp> & ExtractRouteParams<Rest>
+  : PathType extends `${infer _Start}:${infer ParamWithOptionalRegExp}`
+  ? ParamWithOptionalRegExp extends `${infer Param}(${infer _RegExp})`
+    ? ExtractRouteOptionalParam<Param>
+    : ExtractRouteOptionalParam<ParamWithOptionalRegExp>
+  : {};
 
 /*
  * Components: <Route />
@@ -60,15 +59,11 @@ export interface RouteProps<
   RoutePath extends Path = Path
 > {
   children?:
-    | ((
-        params: T extends DefaultParams ? T : ExtractRouteParams<RoutePath>
-      ) => ReactNode)
+    | ((params: T extends DefaultParams ? T : ExtractRouteParams<RoutePath>) => ReactNode)
     | ReactNode;
   path?: RoutePath;
   component?: ComponentType<
-    RouteComponentProps<
-      T extends DefaultParams ? T : ExtractRouteParams<RoutePath>
-    >
+    RouteComponentProps<T extends DefaultParams ? T : ExtractRouteParams<RoutePath>>
   >;
 }
 
@@ -93,10 +88,9 @@ export type LinkProps<H extends BaseLocationHook = LocationHook> = Omit<
 > &
   NavigationalProps<H>;
 
-export type RedirectProps<H extends BaseLocationHook = LocationHook> =
-  NavigationalProps<H> & {
-    children?: never;
-  };
+export type RedirectProps<H extends BaseLocationHook = LocationHook> = NavigationalProps<H> & {
+  children?: never;
+};
 
 export function Redirect<H extends BaseLocationHook = LocationHook>(
   props: PropsWithChildren<RedirectProps<H>>,
@@ -114,7 +108,7 @@ export function Link<H extends BaseLocationHook = LocationHook>(
 
 export interface SwitchProps {
   location?: string;
-  children: Array<ReactElement<RouteProps>>;
+  children: ReactNode;
 }
 export const Switch: FunctionComponent<SwitchProps>;
 
@@ -142,12 +136,8 @@ export function useRouter(): RouterProps;
 export function useRoute<
   T extends DefaultParams | undefined = undefined,
   RoutePath extends Path = Path
->(
-  pattern: RoutePath
-): Match<T extends DefaultParams ? T : ExtractRouteParams<RoutePath>>;
+>(pattern: RoutePath): Match<T extends DefaultParams ? T : ExtractRouteParams<RoutePath>>;
 
-export function useLocation<
-  H extends BaseLocationHook = LocationHook
->(): HookReturnValue<H>;
+export function useLocation<H extends BaseLocationHook = LocationHook>(): HookReturnValue<H>;
 
 // tslint:enable:no-unnecessary-generics
diff --git a/types/ts4.1/type-specs.tsx b/types/ts4.1/type-specs.tsx
index 2e2dd1ef..dcb6619b 100644
--- a/types/ts4.1/type-specs.tsx
+++ b/types/ts4.1/type-specs.tsx
@@ -59,19 +59,13 @@ const invalidParamsWithGeneric: Params<{ id: number }> = { id: 13 }; // $ExpectE
   This is a <b>mixed</b> content
 </Route>;
 
-<Route path="/users/:id">
-  {(params: Params): React.ReactNode => `User id: ${params.id}`}
-</Route>;
+<Route path="/users/:id">{(params: Params): React.ReactNode => `User id: ${params.id}`}</Route>;
 
 <Route path="/users/:id">{({ id }) => `User id: ${id}`}</Route>;
 
-<Route path="/users/:id">
-  {({ age }) => `User age: ${age}`} // $ExpectError
-</Route>;
+<Route path="/users/:id">{({ age }) => `User age: ${age}`}</Route>; // $ExpectError
 
-<Route path="/users/:id">
-  {({ age }: { age: string }) => `User age: ${age}`}
-</Route>;
+<Route path="/users/:id">{({ age }: { age: string }) => `User age: ${age}`}</Route>;
 
 <Route path="/app" match={true} />; // $ExpectError
 
@@ -84,9 +78,7 @@ const invalidParamsWithGeneric: Params<{ id: number }> = { id: 13 }; // $ExpectE
 </Route>;
 
 // infer only named params
-<Route path="/:first/:second">
-  {({ first, second }) => `first: ${first}, second: ${second}`}
-</Route>;
+<Route path="/:first/:second">{({ first, second }) => `first: ${first}, second: ${second}`}</Route>;
 
 // for pathToRegexp matcher
 <Route path="/:user([a-z]i+)/profile/:tab/:first+/:second*">
@@ -153,10 +145,7 @@ const invalidParamsWithGeneric: Params<{ id: number }> = { id: 13 }; // $ExpectE
 
 Redirect<UseNetworkLocation>({ href: "/home", delay: 1000 });
 // example custom hook
-type UseLocWithNoOptions = () => [
-  string,
-  (to: string, foo: number, bar: string) => void
-];
+type UseLocWithNoOptions = () => [string, (to: string, foo: number, bar: string) => void];
 Redirect<UseLocWithNoOptions>({ href: "/app" });
 
 <Redirect>something</Redirect>; // $ExpectError
@@ -175,6 +164,21 @@ Redirect<UseLocWithNoOptions>({ href: "/app" });
   <Route />
 </Switch>;
 
+<Switch>
+  This won't be rendered, but it's allowed
+  <Route path="/app/users" />
+  <>
+    <div />
+    I'm a fragment
+  </>
+  {false && <a>Conditionals</a>}
+  {null}
+  {undefined}
+  <Route />
+</Switch>;
+
+<Switch />; // $ExpectError
+
 /*
  * Router specs
  */